Monitors/Terminals Repair Database

For a while, I worked repairing monitors & terminals. Collected here are some original contributions, but mostly the collections of people with whom I've worked, plus some tips I'd grabbed from Usenet and Anatek. In particular, I'll thank Wes Hansen here, as he kept an amazing collection of repair notes for many years, and was kind enough to share them with me.

Please don't email me asking for help with your rig; I direct you to the Usenet newsgroup sci.electronics.repair .

10Comm
CM4210	Similar to Compaq 420
AAmazing
CM-8452GX	Hori bars in display	Dirty 16v at PS sec. C213 100uf 16v C109 33uf 50v in PS primary
CM-848xTX	HV ok, no display	Ck G2 voltage (should be 200vdc or so). If low, replace C221 22uf 160v near FB
	No filament glow	DMM will not give reading. Ck bad solder on R852 on CRT PCB
CM-8428MX	Squeals or R915 burned up	Ck. or replace R915 22 ohm 1/2w IC902 3842 U902 transistor TL431 ZD914 Z30M 30v 1/2w C953 470uf 16v Q615 D669A near FB R651 0.1 ohm 2w. If no B+, check ZD913 1N4764A 100v 1w. Also ck. HOT MJF16212 for short. The transformer at PS secondary area (sometimes on mainboard, sometimes on bracket by itself) sometimes is burnt.
Acer
7035A	Vert problems	Bad solder C204 and other locations near TDA1675.
7076I	Noisy, ripples, or shuts down	Ck. C389 4.7uf (or 22uf) 250v near center of mainboard. (not the same component as on 7176I).
	PS cycles	No good fix so far. Q313 TIP47 shorted R458 2.7 ohm 2w open
	Other things to check	Bad solder at PS connector, yoke connector, C341 mylar.
	Pincushion	C383 2.2uf 250v C389 220uf 250v
	Various	Ck. yoke connector for bad solder C341 mylar: bad solder.
7176I	Raster, but no display.	Ck. bad solder at 10 wire connector on top of PS, also the M603 connector at mid rear of PS.
	Hori Linearity problem in textmode, 640x480, 800x600, OK in 1024x768 and above.	Q315 IRF630 won't turn on, so C343 isn't switched into circuit.
7176N	Loses sync when warmed up.	Replace IC303 (4151) & IC311 TDA9102C/T
JD144F	Red screen, raster	R944 850 ohm bias resistor on CRT PCB. Replace with 7w ceramic
Addonics
MON-7C6	Similar, but not identical to Viewsonic 5
Adds
2020	PS	C11 4.7uf 25v R8 1800? 120? ohms 2w
	Distorted image or dead or HOT runs very hot.	Shorted FB. FB failure is common on this model. HOT BU184 can be replaced with BU806
	Hori ripple	Try replacing D308 1N4003 with QFR107
	Raster but no display	Bad solder at G & E connections from CRT PCB on vid PCB.
ADI
DM14+	No display	R821 150K 1/2w open R824 1K 1/2w open Flyback bad 1-482-049-03 C707 .0047uF@630V poly cap shorted
LM-1448	Dead	Ck. R926 .43 ohm in PS primary. If open ck. Q901 switching transistor P7NA60FI. If shorted, sub 2SK1507.
LM-1564	Dead	D927 UG4D 200v 4a 30ns in PS secondary. This is D928 or D930 in other models.
SM-5514A	See Compaq 461
SM-5515 Microscan 4A	Similar to Compaq 460	Has analog brightness/contrast pots, three color cutoff pots, color drivers are 2SC3953, uses LM1203.
SM-5515G Microscan 4G	See Compaq 460P	Has digital brightness/contrast controls, one color cutoff pot, color drivers are 2SC3953, uses M51387P.
SM-5517AP	No HV or low pulsating ON/OFF, HV problem	C838 47uf 250v
Alpha Micro
AM-65	See Wyse 150	Setup = <left shift><left Crtl><cancel>
Ambra
BMS4000	Shuts down after awhile	Ck. bad solder on PS connector M605 & yoke connector.
Amdek
655 & 738	Pincushion/width problems.	Ck. D213, C241, Q216.
AM/738	Flickering brightness	Flyback bad.
	Static when tapped.	Bad solder on power connector P102 on PS board.
738?	HOT shorted	C215 100uf 16v C226 47uf 35v C237 47uf 25v.
	Shuts down immediately	Ck. PS voltage, Ck. C116
ALR
?	Shrinking vertically.	Cold solder @ R443 near TDA1675A
AOC
CM-335	Dead (integral PS)	C112 1000uf 25v Ck. R908 220k 1/2w?
	Whine, HV OK, no raster, no LED, Filament OK	12VDC missing from PS. Ck. D954 in PS
	No hori. sync.	Ck. C512
	HOT shorted.	Replace Q510 2SC3861 & ZD503. Replace C315 .0015 with .0047, located at IC301 pin 5 Replace C512 100uf 16v near hori width coil
	Too bright, brightness pot works somewhat.	Ck. G1 near brightness pot connector P05 on mainboard. If about 10v, replace C525 22uf 350v on G1 supply line. Insufficient G1 voltage because high ESR.
	Trouble caps	C512 100uf 16v near hori width coil C542 2.2uf 50v near coupling transformer
	Dead or jittery	Bad solder at C407 mylar at back of mainboard
CM-336	Screen flutters/collapses or dims	C607 47uf 25v C625 220uf 35v C812 100uf 16v All will be bad.
	Width control doesn't work	Q808 2SB861, center rear of mainboard
	Color/display problems?	Ck. on CRT PCB: C717 220uf 16v C702 100uf 16v C711 10uf 50v
CM-346	Hori hold varies with temp.	Replace IC-201 32 pin WT8042 324F (N32?).
4NLR	Loses vertical sync after warm	IC201 WT8042-N32 bad
VGA-C3	No HV	Q502 2SC4742 on side brace Q510 2SB861 on side brace C512 100u 16v next to width coil.
Apple
MO401	Shuts down	C16 47uf 35v? in PS Ck. C34 220u 160v in PS high ESR
	No vert sync.	IC501 uPC1377c on side board
M129x family	Signal cable pinout:	1 = White Ground 2 = White 3 = Clear 4, 10, 11 = Blue 5 = Black 6 = Black Ground 9 = Red 13 = Red Ground
	Dead	Bad solder on rear ON/OFF switch
	Various jitters	Bad solder on rear seven pots and FB pins.
	HV shutdown after 4 seconds	Bad FB FB often go bad. Sometimes low HV, sometimes very poor focus and HV shutdown, sometimes brightness changes, sometimes heavy static. FB number 334P031-1 The Taiwan replacement FBT often has the HV lead in a different place, and the top bracket mounting must be broken off to let the metal cage sit down on the mainboard fully to solder it on. HOT is 2SD2095 or 2SD1650
M1787	Goldstar chassis, but can't be run from VGA
	No raster	C319 103K 1kv cap on G2 line on CRT PCB
M2933	HV Shutdown after 4 seconds	LQ2 IRF960 RL83 10 ohm
M2943	Can be run VGA, with an adapter.
	A color missing	Bad solder at many locations on CRT PCB.
	Bottom half of screen has no hori sweep. LED lights both green & amber.	C001 470uf 16v on power saving dboard on right side of chassis.
	No HV	Q405 2SB1375 L401 burned up
	Hori collapse or foldover	C438 .51uf 250v mylar
	Chirps	Q418, Q807, Q417, Q405
	Width or hori lin problem	C418
M3502	R122 2.2 ohm burns up	Blue mylars bad Ck. HOT 2SC4288A, sub 2SC887 11nf, 5.6nf, 680nf HV caps. C661 33uf 35v in PS
	PS output voltages:	172, 77, 18, Gnd, NC, 6.2, Gnd, -18
	LED cycles	C106 C108 R109 R119 3.3 ohm 3w
	No HV, LED on	R113 3 ohm 4w
	Dead	V105 C106 C108
M4222	Similar to Philips CSJ5209, but different CID numbers	Same bad solder on 7153 regulator at back of chassis.
	HOT shorted	Ck. 7816 IRF620 on rear (sub IRF630).
M6014	Blooming color	L6B2 (for blue) inductor open on CRT PCB. Other colors: similar part open.
M9102LL/D	Similar to Philips CSJ5209/743. Will NOT sync to VGA.
Various 14, Goldstar chassis	Blown fuse	Replace posistor (Sincera DGC3R08M, sub 8ROM CCS No. 34-1016-3, NOT C8ROM!) & SLO fuse, repair solder at Q706 near FB.
Arche
214S	PS LED cycling, little or no HV	Replace C416 47uf 160v near FB If still a problem, replace IC101 3842 in PS. If still problem, ck. secondary diodes, ck R601, replace vert processor U601.
	No brightness control or LED flashing.	Ck. C507 2.2uf 250v D508 R508
	?	Replace three color pots on CRT PCB
	See also Helm CM1448M: it's similar, but has color processing on the CRT PCB.
215AXL	Shorted HOT Q503	Replace Q503 MJF16212 with MFW16212, and add insulators NTETP008 & NTE422.
215S	Vert too large	Q204 2SC1015 TO-92
PX 14S	No brightness control.	Ck. C508 on mainboard, D904 on CRT PCB Ck. R510
	Shuts down when signal cable connected	Replace C412. If still problem, replace 2SC388?
Arcus
DCM-1458 E	No display, weak HV	Turn up G2. If you can see no hori sweep, bad solder L403 hori width coil.
AST
1414AE1	Narrow, pincushion, front width control doesn't work	Bad solder on Q409 on heatsink next to FB. Have to remove PCB from plastic frame to resolder.
	Ripple, noisy	C812 100uf 200v
	?	(in some models) C824 1uf 160v C806, C808 2.2uf 100v All under TDA1675A heat sink in PS.
SVGA-LR14	Bad solder symptoms	Reflow solder at dboard connectors on dboard.
500902-001/SVGA LR	HV shuts down or no HV	Ck. C322 (blue box).0056uf @ 1600v Later models have .0062uf. If more width is needed, replace with .0068uf. Ck. Q312 2SC3885 for shorted outside pins. Remove FB to access screw.
	Continues to short HOT	Bad FBT, Sampo FEA229
	Hori width varies	Bad solder at tiny dboard on large dboard.
	Too wide, hori lin. problem	C350 .91H 250v mylar
	Brightness fluctuates	C327 4.7uf 250v
	LED flickers, no HV	C11 330uf 25v in PS.
Vision 5L	HV shutdown	Bad solder at transformer on dboard above PS.
	No width control	D503 GI9424
Vision 7L (RM07F11)	Hori problems, smoke	Ck. C350 1uf 250v Ck. Q350 1001R Ck. Q302 IRF630
CM41	see N461D (very similar)
N461D/SVGA-NI	Screen size changes with brightness control or width too wide.	Replace C738 near hori centering pot.
	No sync.	Bad solder on crystal on dboard.
	Dim & shakes, vert linearity problem.	C610 220uf 35v C710 470uf 16v C929, C712, C611
	Raster but no video	G1 (CRT pin 5) should be 44v. If 110v replace Q601 2SC1921 or 2SC2229 giant TO-92. Located between FB and transformer.
P766D 17	No power	Ck. HOT 2SC4924 C501 220uf 35v
AT&T
CRT329D	NEC chassis, but with integral PS
	Dead, fuse ok	Replace in PS: C624 10u 50v C618 1uf 50v C615 47uf 35v
	?	C651 C652 100u 160v (PS sec, B+?)
7134T	See Acer 7134T
Austin
1765D	see CTX 1765D
CB1716SL	See Smile
Axion
CM-1428A	Blurry, ghosting to right.	C525 10uf 160v
	Blown fuse	Ck. BD101 bridge rectifier
CK-2148	Blown fuse	Ck. BD101 bridge rectifier
Aydin Controls
8912	VLin bad	C521 100uf 100v C518 47uf 25v C519 2200uf 25v
9010P	Blown fuse	Ck. switching transistors Q711 & Q712 MJW16018 and bridge diodes. Ck. rev. of PS. If MPS-001, replace with MPS-003 for long-term reliability.
Calcomp
FC20AS	See Sun FC16AS.
Cheer
VC14C	Dead	C618 100uf 25v
Compaq
Series 3200 (1 unit)	HOT ok out of circuit, no HV	Shorted FB. Pins 5 & 10 should not be shorted.
312A (Presario 1525) FCCID: BJMCM15UM	Sizzling, hori distortion like hum bars	C804 220uf 250v pri. filter cap C816 100uf 35v in PS pri.
420	Flickering	Remove and resolder bias wire. Remove glue on CRT PCB.
	No vert sweep	See note for 420T
420K	Various odd	Ck large filter caps in PS for leakage around the bottom.
	Shuts down	Replace UPC1498H (?)
420T	Various odd	Ck C18 470uf 25v in PS
	HV ok, no raster, filament glow	Remove glue from G2 (orange) and G1 (brown) wires where they enter the CRT PCB.
	HV ok, no raster, no filament	Bad solder on flyback pins, to feed filament.
	No vert sweep	Ck. R215 8.2 (or 15) ohms 1w, located 1" left of IC202 TDA1170N (feeds pin 2 Vcc); if burnt, replace TDA also. Ck. R320 1 ohm 1w off FB pin 5 & 6
441 (151FS)	Vert sync problem	Replace Q606 near TDA1175
446	See ADI LM-1564
450/Qvision	Various	Ck. bad solder CRX3750 bridge rectifier in PS
	Flickering, vert rolling static	Ck. C3763 47uf 25v above switching transformer in PS
460/461	Uses UXO51B010Z processor, soldered in.
	Hori dark streaks to the right of white areas	Ck. C729 330uf 16v, C720 10uf 160v on CRT PCB. If no improvement, rejuv CRT.
	No display or hori lines	Replace UX051B010Z on dboard with ....214z and remove Q825. Or replace with ....311Z and follow the complex modification instructions.
	No or dim display, HV OK	Replace color gun driver transistors Q701, Q702, Q703 (FQ235A) on CRT PCB all at once.
	LED is amber not green. No HV.	Ck. for no vert sync signal at CRT PCB. If missing, replace signal cable.
	No power or gets wider and shuts down	C812 (?), C815 220uf 50v (?)
	HV shorted	Ck. D818
	Vert position stuck at bottom	Ck. for cracked traces near standoff near dboard.
460P	Uses socketed processor, UX053B122Z or ...012Z or ...229Z
	No power or gets wider and shuts down	Replace C815 220uf 50v. Always bad.
	Won't sync	Ck. Q814 2SA1015
	Dim before rejuv	Ck. Q822 2SC2229 near back of FB
	Too bright, control doesn't work	Ck. G1 (should be -25v to -35v); if +20, ck. R841 27k near FB for open.
	Color problem	On dboard with M51387P on CRT PCB: C10, C11, C12 2.2uf 50v C01 100uf 25v
462	There are two versions, with different FBT and uprocessors
	No HV or no initial sync	On version where U101 uprocessor is UX063B219B 42 pin, ck JB56 4.7 ohm 2w, located to the left of where video cable comes in, behind round black L401. If open, when replaced verify that B+ is 140+v and U801 TDA4852 oscillator is running at 63khz. Try running it and immediately do mode switch to higher res. If B+ comes down and unit syncs, replace U101 uprocessor. It is not initializing D/A converter U109 TDA 8444P. This unit uses FBT LZI74A304N
	Loss of focus with temp	This version has 2"x3.5" hori dboard above uprocessor U101 28 pin, and FBT LZI74A304T, replace FBT?
471P & 472P (Samtron)	Dead or too wide & pincushion	D312 BYW96E-PH on heatsink near FB (sub BY329-1200) KSE800 (no CID or Q803) on heat sink with TDA8351 (sub MJE803 with insulating pad)
472P	No power	Ck. R102/R103 270k ohm in PS for open.
	No HV with signal cable connected.	Ck Hsync on signal cable. If no Hsync, HV will not come up with other signals present.
473	Chirping	Q7086 BU2508AF HOT Q8905 IRF620 FET
	Raster/retraces	R3780 10 ohm 1/2w open on CRT PCB
Conrac Elektron
N7C0C0	No HV, noisy PS	Dual power supplies: R621 1 megohm in PS is open, preventing B+ side of PS from starting. Easy check is to power up unit, try to measure voltage at base of switcher. Unit will start up. OR: Ck. D683 FR302 in PS secondary. Replace with QFR307
	No HV, noisy PS	Ck. D683 FR302 in PS secondary. Replace with QFR307
	Pincushion	C622(?) 2.2uf 50v near rear center.
	Blown fuse	Ck. Q621 TIPL760C (can sub 2SC3447). If shorted, replace Q622 2SC1213 Ck. R622 .22 ohm.
	Blown fuse	D602 20D62I (can sub QFR307) in PS primary
CTX 1.800.888.2012, Fax: 909.598.8294

1451	Chirps	Ck. HOT Q701 2SC5149. If shorted, replace with BU2520, per CTX tech supt. Always replace C722 47u 50v next to HOT! Replace R734 1k with 1.5k ohm (optional) Check: Q406 2SD386A, replace with 2SD1138 Q407 2SC2705 giant TO-92 (next to Q406) Q410 IRF630 or 2SK890 (can sub IRF640) R434 1.8 ohm
	Continues to blow HOT Q701	Replace FBT 47F13-0330 with Sampo FEA247, Ck. Q102 2SD313 in PS sec.
	Pincushion or HV shutdown	Q406 2SD386A, replace with 2SD1138 Q407 2SC2705 giant TO-92 Q410 IRF630 or 2SK890 (can sub IRF640) R432 1k ohm
	Hori wrap/fold or Q405 shorted	C722 47uf 50v next to Q701 HOT Ck. Q405 2SK791 on heat sink plate
	Dead	Blown solder at ON/OFF switch
	Dead	Ck. D104 in PS (may read marginal). Replace with QFR307, not 1A.
	Color problems	Bad solder on 9 resistors on CRT PCB
1451C	Vert sweep too tall	IC WT8045-N28-2
	Pincushion	Q404 2SA1015
	Hori non-linearity	C233 .5uf 250v in yoke return circuit.
1461, 1561	Blown fuse, Hori transistor OK	Change PS Transistor Q101 (2SK955), remove ZD101, remove & resolder mounting connector on dboard @ P104 EVERY TIME.
	PS Trans Q101 shorted	If, after replacement, blows again, change IC101 UC3842 on dboard.
	Flashing power LED	R114 should be 0.39 ohms, +- 0.1 ohm. Also ck. daughterboard mounting solder on dboard.
	Display size changes with brightness control.	R114 should be 0.39 ohms, +- 0.1 ohm
	Flickering, 95v is high and won't adjust down.	Replace IC101 UC3842 on dboard.
1461LR	No video	Ck. R433
	Display size adjustment: use VR205 to adjust 1024x768 to same size as VGA
1560LR	Pincushion	Ck. vert deflection IC201 LA7838 for bad solder. Ck. R449, under IC402, for bad solder. Pull IC402 LM317 and remove glue.
	Pincushion when warm.	Replace Q407 LA7837
	Display changes size when adj brightness	Replace C118 100uf 350v
	Jittery	C424 220uf 250v near FBT.
1561LR	Raster, no display	Ck. contrast voltage at IC601 pin 14. Should vary from 4.7-8v.
1562LR	Odd width problems	Bad solder L402, R407, D501 Bad .1uf mylar feeding an op amp that feeds the hori one shot NE555 or similar.
1565D	Dead	Q701 HOT 2SC4924 C701 100uf 50v Ck. Q401 2SK890
	Streaks	Replace on CRT PCB: C632 1uf 160v C620 1uf 160v C633 1uf 160v C617 1uf 160v C631 1uf 160v
1760LR	Flashing power LED	Ck. Q401 HPA100 Hori output & Q412 C4769. If shorted, check Q305 2SD386A on tall black heat sink. It will be shorted or low junction (all should be .500). I have seen this factory modified to use 2SC2898 with a jumper from the lower pin of P308 to the upper pin of Q305, and the trace cut from the lower pin of P308. Outside pins of 2SC4769 are normally shorted. Ck. D410 for open. Ck. C308 4.7uf 250v, C135
	Pincushion/width problems	Q304 2SC3468E and the one next to it.
	Piecrusting	R353 10ohm 2W
	Various	See 1760DF PS writeup Ck. 47uf 250v cap. This cap is located at the back of the board by where the signal cable comes in and is connected to point S on the PCB.
1760DF	Dim and too wide	Replace C418 mylar next to transformer.
	Various	Bad solder on all PS output connectors, PS transformer T101, back of dboard mounting P105 (like on 1461 series), P306 on mainboard. Replace in PS: C111 330uf 25v C126 470uf 35v C127 470uf 35v Ck. D112 for glue or open. PS voltages on P106 should be 95, 25, 12, 7.5, 5 Bad solder on P11 & P13 on mainboard dboard riser.
1760x & 20	Jittery	Ck. bad solder on PS connector P106
1765D	No HV	Q335 2SC4769 HOT Q338 2SK1377 R470 .68 ohm 1w IC303 UC3843M R465 10k ohm 1/4w (sometimes burnt) R496 value unknown (2.5 ohm?) D327 BYV26C sub SF36
1785GME	Dead	Shorted bridge. Ck. bad solder on PS secondary harness connector.
3436	Dead	Ck. R143 1.8 ohm 5w ceramic in PS
5431	Vert colored bar on rt side	C704, C705, C706 2.2uf 50v on CRT PCB. Also resolder CRT socket
5468	Hori linearity problem	C322 .39J 400v. ESR should be less than 10.
	Dead	Ck. R104
	Dead, no LED, but PS runs	Ck. FB pin 9 for B+ of 105v. If present, look for bad solder at T301 hori coupling transformer.
	Chirps	Ck. R103; changes value
	Dim	Replace R303 270k with 470k 1/2w. Helps.
5468A	Vertical collapse when smacked	Ck. for bad solder on C208 under CRT at front of mainboard.
	Shorted HOT Q301 2SC3892A	Ck. also Q419 2SK357 B+ regulator D435 PH-33G
5468NI	Too wide	Replace C314 .0082 630v mylar
	Vert compressed	C403 mylar? near center left of mainboard.
	Vert compressed	Add resistor 100k ohm across pins 2 & 4 on IC402.
	Dead	Ck. HOT Q301 2SC3892A D435 PH-33G Q419 2SK357
6468ES	Shorted HOT Q701	Ck. add-on zener diode under ceramic resistors R404/R407; may be shorted.
Daewoo
1502B1	Pincushion, smoke	D602 near FB. Fried, beyond ID. Sub'd FR155. Q604 2SB988
Darius
D-1450	Hori phase or sync problem	C502 .0056 100v mylar off pin 14 of I504 74HC4538AP at center front of mainboard.
Datas
TC-7423V (Edison, Sceptre, Royal)	Dead, fuse ok	Q71 2SC4236 switcher. Can sub 2SC4237 Q72 2SD667 switcher driver C709 10uf 50v hidden under transformer C711 2.2uf 50v (not always bad) R706 .68 ohms 1w R702, R703 100k ohm 1/2w filter bleeders
	Vert linearity	C412 3.3uf 160v C303, C304 47uf 16v
	Slow HV startup	C524 10uf 50v C410? 47uf 25v C801 .47uf 50v C803 100uf 25v
	Vert bars in display	C207 330uf 16v
	Color problems	C126, C127, C128 2.2uf 50v C310 10uf 160v
Daytec
DT1418AD	Dead or white display	Ck. pin #1 on FB for blown solder.
DT14-SNI	Hori static in display	B+ filter cap C812 100uf 200v at PS secondary. See also AST 1414E1. Ck. bad solder Q382 on heat sink plate around FB.
DT1530	No display	Resolder all pins on CRT socket.
DT1731	No HV	B+ Ok, voltage on HOT xformer ok: IC341 LM7812 regulator near FBT
Dell
15fs	Too wide	Ck. D405 MUR460. May read ok, but try replacing it. Ck. Q510 2SB716 for short.
	Shorted HOT Q403 BUH715 or very noisy operation & HOT gets hot.	C961 1uf 50v C417 10uf 250v C401 10uf 25v C403 2.2uf 50v
17ES/P1728U	No HV, flashing LED	Ck./replace HOT Q503 2SC5044. If shorted, ck. Q534 2SJ307. After, ck for these getting too hot. No known repair if they do.
	Odd picture	Requires special external signal cable w/unique pinouts.
17FS-N/VC7N	HV shutdown	Cooling fan dragging/locked up/not coming up to speed; shuts down PS.
D1728D-LS	Color missing	IC102 LM2427T
DL-1460NI	Dead	D110 HER305 400v 5A 35ns in PS secondary
Vi1428u	Display blanks	Ck. C414 10uf 250v near FBT Ck. C424 33uf 160v near FBT Ck. C438 1uf 160v near signal cable
VC-3	See NEC 2A (JC-1403)	VC-3 is the same mainboard, with different brightness/contrast controls.
Digital
PC7XV-DE	See AST 500902-001
PCXAV-F	Dims out over 30 minutes	G2 drops off from 190v to zero. Gray focus divider is the problem. HQ3376CP 92611 VDE-REG.-NR.4453
PCXBV-DE	ALWAYS REPLACE!	C466 22uf 160v near FBT.
	No HV	Bad solder L401 near FBT
	See also PCXBV-DE, which is very similar.
PCXBV-PE	ALWAYS REPLACE!	C466 22uf 160v near FBT.
	No brightness control or black display (no G1)	C466 22uf 160v near FBT. Q412 BF422 TO-92 R477 47k 1w (drifts to 53k, too high)
	Too wide	C457 4.7uf 50v NP in HV section Q406 2SK526 D405 (9132)
	Vert foldover, screen pulsating at full width	C818 100uf 250v PS secondary, B+
	Dead, shorted HOT	Q808 2SK526 Q402 2SC5002
	Bad moire pattern	see "no brightness control"
PCXBV-RD	Dead, smoked	Blown solder at L406 hori width coil.
Digiview
HR-1428	See AOC CM-335 (with separate PS)
DTK
MMD-1700T	See Taxan 640
E-Machine
T16 GDM1602 1950 (Sony)	Pincushion problem	Replace (2) RC4558 on dboard #DB.
T16 II	See Mag MX17
Edison
CM1402	Vert foldover	Ck. C417
1439SV	No sync (H or V)	No 5v on ICs. Ck. IC502 5v regulator.
	No contrast change from front panel.	Replace LM1203N.
Electrohome
38-K41IMJ-01	Won't sync on green	HSync = Gray, pin 8 (internal cable) VSync = White, pin 9 (internal cable) HSync = pin 4 (DB9) VSync = pin 5 (DB9) Ck. for 12v at IC LM1881 pin 8 on sync separator PCB (PCB under label). If no voltage present, Add jumper wire from IC901 LM1203 pin 1 to connector PL901 pin 10.
EMC
SA-770	Dead	C635 22uf 250v rear center of mainboard, Q630 IRF634A FET, D632 31DF4 Diode (watch out! on one rig I repaired, the cathode is silkscreened one direction on the top of the PCB (correctly) and another way on the bottom (incorrectly). From Anatek: "EMC is now recommending a chassis modification, to reduce the value of C635 to 10 uF/250V (from 22 uF). Apparently, the original value of C635 was excessive, and overstressed the circuit, causing the failure of the rectifier, cap, and FET. Also, D632 is now recommended to be outright replaced, regardless of how it checks, when C635 has failed; the rectifier can be damaged, yet still test fine on a DMM."
Emerson
1415EM	HV OK, no display	Coil open in filament circuit on mainboard. Marked as a resistor.
1420EM	HV OK, no display	Bad solder in PS to filament circuit.
Epson
T1184U	Raster, too bright	C235 22uf 350v next to FBT
	Hori tears, varies with width	Adj. VR703 on defl dboard.
Esprit
Opus 2/3n1/4 (vid PCBs are similar)	WARNING!	Discharge large cap on CRT PCB before removing video PCB.
	Replace list (Opus 2/3n1):	C805 = 6.8uf 50v NP C808 = 680uf 50v C812, C813 = 4.7uf 250v C802, C806, C841 = 1uf 100v (C841: negative leg toward FB) C602, C612 = 1000uf 25v C605 = 100uf 25v
	Replace list (Opus 4):	C805 = 5.6uf 50v NP C808 = 680uf 50v C812, C813 = 4.7uf 250v C802, C806, C810 = 1uf 100v C801 = 4.7uf 50v C602, C612 = 1000uf 25v C605 = 100uf 25v
	Vert ok, little or no Hori	Ck. C805 NP 5.6uf 35v near FB
	Display shifted to either side	If replacing the HOT & caps doesn't fix this, adjust the hori phase (blue pot on logic PCB near AC socket)
	Shorted HOT Q802 BU406	Replace with BU806 or BU807
(Opus 2/3 & 4 PSs are similar)	Noisy PS replace list:	C906 100uf 25v C905 10uf 16v
	(4 diode heat sink version only. May ck. OK, replace it anyway)	C931 470uf 16v
	(1 diode heat sink version)	C919 10uf 16v
	Hot regulator in PS (front heat sink, L200C) (not a complete cure)	C916 470uf 25v C915 1000uf 25v
	Dead PS	Ck. shorted Q901 2SC3150. If shorted, replace Q902 2N2222A, Ck. shorted IC901 optocoupler CQY80NG at connection to base of 2222A.
ESP6310	WARNING!	CRTs do not self discharge!
	PS low voltage (should be 15v to video PCB)	Replace C506 & C507 1uf 50v in PS.
	?	Ck. C506, C507 1uf 100v
Everview
TCM-0456	Hori linearity problem	C419 474J 250v mylar (poly?)
TCM-0700	Dead PS	In PS, ck: diode D18 Q1 2SK1461 Q2 9314 IC1 UC3842 oscillator. On mainboard, ck: C630 220uf 250v near FB
Eye-Q
CM48U	See AST CM41
Falco
500	Component list for vid PCB P/N 230265 (7 pots face up).	R609 = 120 ohm 0.5w. Burns up.
	Various	Ck. C411 470uf 25v On PS w/(2) filter caps, they both go bad: C6/C7 100uf 250v
	No video	On PS w/(1) filter cap and (2) output connectors, low vid voltage (under 11.5v), replace: C17, C20 = 1000uf 25v C22, C23 = 2200uf 25v On PS w/(1) filter cap and single output connector: (style 1) replace C7 1000uf 25v (style 2) replace C7 47uf 50v C12 10uf 35v
	Brightness Control:	<Ctrl-Up> & <Ctrl-Dn>
	Yoke connections to vid. PCB:	Front: Orange-White-Blue-Red: back.
Gateway
?	No (?) sweep or smoked.	C144 R153 Q115 D107 D113.
PMV1448	Raster, no video	Ck. contrast pot, replace IC601 LM1203AN (Phillipines) with another sourced 1203.
	PS problem	Ck. C232 330uf 100v in PS on 80v line.
	High pitched whine in 800x600	C308 47uf 35v in PS C311 47uf 35v in PS C319 220uf 35v in PS C330 220uf 35v in PS
PMV1448NI (1024NI)	Hori ripple	Ck. C204 & C206 0.1uf
	PS Dead, fuse OK	C308 330uf 25v or 47uf 35v C319 220uf 25v
	PS Dead, fuse blown	Ck. Q301 switcher SSP4N70, sub 2SK1023 Ck. D308, sub QFR307 Ck. C319 220uf 25v If still won't oscillate, replace IC301 UC3842
PMV14VC (1024NI)	Display dim (or goes dim)	Ck C503, C510 near FB, C515
	Vert shrinking	Replace IC201 TDA1675 When replacing the vertical IC on this monitor, change C201 to a 220uf 35V . Change the jumper J118 to a 1k ohm 1/4 watt resistor. This should prevent IC201 TDA1675 from burning out again.
	Vert linearity problem during warmup	Replace: ZD201 3.2v 1/2w Q203 C945 C205 C206 mylar .01uf 50v C208 mylar .33uf 50v
	PS Crowbars	Flybacks short in this model. Try desoldering pins 1,9,10. If PS comes up, replace FB. TF2-3V0-070-L3 or L5
	PS Crowbars	Try unplugging the power cable to the color board under CRT neck. IF HV comes up, ck. all tantalum caps (yellow) on color board for shorts.
CS1024NI2	No vert deflection, or too wide & pincushion	Ck. bad solder at yoke connector. R241 20 ohm 1w, ZD202 20v 1/2w Ck. R335 33.2k ohm Ck. R325 33.2k ohm in PS regulation feedback (see "smoked" below). It drifts high, and PS will run high as a result. Ck. 180v line at pad on bottom of mainboard. If it can't be adjusted to 180v or lower, using VR301, R325 is probably high. If IC201 TDA1175A is bad (pins 4 & 5 shorted), ck C205 220uf 35v on Vcc line pin 2.
	Smoked	Ck. R325 33.2k ohm 2w, which feeds IC303 TL431 through R326 887 ohm 1/2w. Ck. Q303 2SD799 B+ regulator.
	LED blinks, HOT OK	Ck. IC201 TDA1170. Pins 4 & 5 should NOT be shorted.
1430+	No brightness control	Ck. R761
CS1572 Vivitron	See Sony CPD-15F13
CS1572FS	Noise/whine in PS, Ripple in display.	R331 (behind PS transformer) should be 91k ohm, may have drifted to 100+k ohm. Replace with 1% metallized resistor. Adjust 85vdc afterward. If symptoms persist, ck. ZD302 12.2v.
	Intermittent purple display	Ck. signal cable ground; may be loose where it is crimped to clamp at chassis?
	Vert size changing	Bad solder R302, Q105 (swivel base hits them).
	Shorted HOT	Bad coil L106. 6mh or better. Ck. C116 10uf 50v
	No HV	No HOT oscillation at base: ck. IC706 regulator (near R331 on heat sink w/dboard on top) for 12v output. If low, ck. Q121 2SH945 (sub 2SC945) 2" back and to the right. Shorted and holding 12v down.
	Jittery, display tries to collapse.	Glue, or bad solder on 1"x1.5" dboard screwed to top of heatsink IC706 under CRT.
	Wide, pincushion	Ck. D104 31DF for low forward bias
CS1776LE	See Mag DX17F
DX17S Vivitron	HV Shutdown	See Mag DX17F note for HV shutdown & TL082.
YE0711-01, aka (MON017010AAWW)	Display shifted to right, all controls work.	R515 4.7 ohm 1/2w, near FBT D505 ? sub 1N1004 near front IC
	Problem spots:	C232 4.7uf 50v bipolar C514 4.7uf 160v to rear of FBT
Goldstar
Various models	Blown fuse	See note in Apple section about posistor DGC3RO8M
1460	No HV	Ck. R715-1 15 ohm. Will drift high.
1460DL	Loses hori sync.	Ck. C710 mylar 222J.
Helm/Impression
IM1428SV	No LED, fuse OK	Open resistor R807, 47k ohm 2w
	HV shutdown	C424 33uf 160v near FB
	Reduced size & dark	C204 1uf 50v
CM1448M	Replace always list:	C430 22uf 200v near FB C309 10uf 200v near FB C428 1uf 50v coupling trans C319 100uf 25v vert proc. C839 10uf 200v PS sec. C826 22uf 200v PS sec. C904 4.7uf 100v CRT PCB C934 4.7uf 100v CRT PCB C964 4.7uf 100v CRT PCB
	Chirping PS/HV shutdown	D809, D/Q808 2SK526 transistor on heat sink. Ck. R430, C309 10uf 200v near FB, C838. Ck. D402 BY329 by yoke connector. Lastly, replace TDA4800.
	No power	Ck. C319 100uf 25v near vert processor. If shorted HOT Q403 2SC3884, replace with 2SC3886 and replace C428 1uf 50v near coupling transformer. Also ck. coil L802 for burnt. Will still chirp after HOT replaced if L802 is shorted. Replace with a coil of about 15mh.
	Width too narrow	Replace: C827 47uf 200v PS Sec. C839 10uf 200v PS Sec. C838 100uf 200v PS Sec. C428 1uf 50v coupling transformer D/Q808 2SK526 near signal cable
	Color problems	Ck. R933 on CRT PCB. Will have burned solder off.
	Color problems	Color adjust pots VR304, VR305, VR306 burn up. 20k ohm.
	Brightness pot doesn't work.	If G1 is +12v instead of -30v to -40v, ck. R325 20k or 27k near FB for open. Replace C309 10uf 200v near FB
DCM-1588 or Impression5	Dead	Bad solder on isolation transformer by AC socket.
Hitachi
CM2086A 3UX	No power or shuts down during warmup (< 15 min.)	Bad solder T902 in PS
HM4319-D	PS cycles	C108 47uf 100v C103 10uf 50v
HP
D1187A	See Mitsubishi 6905
D1195A	Dim	C132 100uf 16v heater filter
D280xA (Samsung)	Vert foldover, too bright, raster shows	Ck. for burnt R201 100 ohm 1w. Replace IC201 TDA8351 which apparently draws too much current on pin 3?
	PS voltage too high	Ck. R111 33k under heat sink. If open, the STR58041 will overdrive.
	Smoking	Ck. D801 1N4937 near FB.
L1906 (version 1 w/two boards) Pic 1 Pic 2 Pic 3 Pic 4	Dead, or no backlight, or cycles ON/OFF every few seconds	Ck PS filter cap C905 150uf 450v Found completely open on one unit
L1906 (version 2 w/two boards) Pic 1 Pic 2 Pic 3	Dead	PS filter caps bad: C822 1000uf 10v C823 1000uf 10v C824 1000uf 10v Replace all three with 25v or 35v 105�C versions. Ck large filter cap (C805 150uf 450v)
L1906 (version 3 w/single board) Pic 1 Pic 2 Pic 3 Pic 4 Pic 5	Dead	PS filter caps bad. Always: C822 1000uf 10v C823 1000uf 10v C824 1000uf 10v Replace all three with 25v or 35v 105�C versions. For the taller caps (my 35v ones), I had to remove a small rubber cap on the chassis for clearance. Less common: Ck large filter cap C805 100uf 450v
L1906 (version 4 w/single board) Pic 1 Pic 2 Pic 3	Dead, or no backlight, or cycles ON/OFF every few seconds	Always: Replace PS filter caps: C1 470uf 25v C9 470uf 25v C855 470uf 25v C862 470uf 25v C864 470uf 25v
Hyundai
?	Screen shifted to side.	Replace hori centering pot & C527 mylar, C531.
HCM-401	Squeals, no HV	C217 10uf 100v on CRT PCB 75v line Usually caused by PS caps failing.
	Noisy on power up	C712, C713 100uf 160v in PS C709 47uf 16v in PS
HCM-402C	Noisy PS, no HV	Ck. C526 220uf 25v, near ceramic resistors (which will have bad solder).
	Vertical problems	C409 2.2uf 50v
HCM-423E	No raster, whining.	Ck. voltage off the transformer that feeds the base of Hori. Output Transistor: should be 22VDC. If so, replace IC TDA1180P @ U504
HCM-437E	Brightness problem	C324 10uf 250v near FB
HN-485S	Bad ripple, noisy	Heat/freeze C754 472K. Replace if symptoms change.
HV4850	No B+ or dead PS	D706 2SD401A near PS
I-O Corporation
1196	Dead	C6 47uf 25v in PS
	Ripple	C9 470uf 25v in PS
IBM
3180	Various	On mainboard, replace: C241 4.7uf 350v C212 10uf 160v C242 100uf 160v C102 47uf 50v C103 22uf 63v
5153 (CGA)	Dead or shuts down	C812 1uf C815 4.7uf 50v C826 47uf C507, C537, C567 2.2uf R213 2.2 ohm 1/2w fusible C821 47uf FBT TFB150A HOT T401 TLN114 Q801 2SD1185
	Dim	R438 200k ohm 1/4w C509 4.7uf 250v on CRT PCB
	Display drifts to side	C213 1uf
	No vert sync	Q402 HA11235 vert IC If problem persists: C305 140pf C307 470pf
	Vert problem	C302 1uf 50v near HA11235
5154 (EGA)	Dead or shuts down or comes up slowly	If PS outputs too high: C11 47uf C13 10uf C14 1uf Also check T5, T6, T102 MJE13005 L252 8.25mh, 2.2ohms T400 TIP30B T251 BUX32B HOT? T103 BU208 R105 1k ohm 1/4w R115 220 ohm 1/4w IC100 LM324 C605, C705, C805 22uf
	Shuts down immediately	C812, C815, C826
	Vert foldover in CGA mode	IC400 HCF4053BE C311 100uf
	Arcing noise, intermittent startup	D103 T102 MJE13005 IC100 LM324
	Color(s) missing	T605, T705, T805 2SC1507 T606, T706, T806 2N2369 D801, D802, D803 1N4148
	Pincushion	IC401 LM324N B+ filter caps 220uf 250v
	Display shifted to side	D401
	Raster, no video	R110 2.2k ohm 1/4w D102 BA159
	Streaks, dimming to right	T706 SK3444
	Too wide, hori wrap	T400 TIP30B
	No hori sweep	T400 TIP30B IC401 LM324N
6312-001	Dead	C028 1uf 50v in PS under heat sink
6314-001 (Goldstar)	Hori wrap, small display.	Ck bad solder on dboard connector mounts P701 near FB. Repair by bypassing bad connector with wire.
	Various jitters	Bad solder yoke connector P702, Q705 near FB, IC601 on Rt side, R952 & R953 in PS secondary.
6321-001	Dead	R111 burned. 3.9 ohm 2w seems to work ok.
6542-301	No display or HV shutdown	C164 1000uf 25v PS secondary filter C162 470uf 25v filter to 15v/12v line. C161 100u 100v for good measure.
6543-301	HV shutdown, slow startup, chirping HV	C164 1000uf 25v PS secondary filter C162 470uf 25v filter to 15v/12v line. C161 100u 100v for good measure.
7534 (EGA)	Dead or shuts down	Can be FBT TFB-176G or TCH-141 Q408 2SC2898 Q305, Q412 HD14053BP R32 780k ohm 1/2w In PS: C3 330uf 35v C4 10uf 35v C10 1uf 50v C32 47uf 200v If Q408 hot, ck: Q409 HA17324. If still hot, replace FBT Q407 BU208 Q209, Q210 BC307B Q408 2SC2898 Q403 2SC1094 R444 10 ohm 1w R445 470 ohm 1/4w R446 56k ohm 1/4w C418 2.7uf Q405 2SB856 L401 TCH-141 CCS #34-1029
	Shuts down	C409 47uf 16v C432 22uf 50v
	No vert sweep	R320 2.2 ohm 1w Q302 2SD1138C Q303 2SB861C Q401 HA11235 Q301 2SC2921
	Vert foldover	C314 4.7uf 160v, next to Q304 near vert section.
	Comes up slowly	R28 100k ohm 2w
	Raster too bright	R454 2.2ohm 1/2w fusible Q205 BC237B Q413 2SC458C
	No hori sweep	Q403 2SD1094 Q404 2SD667 Q405 2SB856 L401 TCH-141 CCS #34-1029 C415 0.1uf 250v mylar
	Too wide	L401 TCH-141 CCS #34-1029 Q205 2SB856 C417 1uf 100v C414 9600pf 1600v D407 RGP15M
8503	Raster too bright	R425
	Dead, blown fuse	Bridge diodes D801-4
	Dead, fuse OK	FBT TFB-6481/E LV transformer TPW332D/A Bad solder on mainboard, esp. near vertical section. HOT shorted.
	Dim or no video	C422 100uf 25v Q403, Q404 Q206 2SD1609C
8512-72	Dim	Replace flyback
	Too bright	R542
	Vert foldover	Ck. C425 100uf 35v
	HV dies, PS stays up.	Ck. HOT Q502 2SC3026. It won't be shorted, but using an oscope you can see the signal die there at the base. If signal ok, ck. signal @ Q501. R540 1 ohm 1w
	HV problems	Replace: C534 220uf 16v C537 22uf 160v C545 22uf 250v All will be bad. Ck. Also C852, C806, C816, C826 2.2uf or 3.3uf 400v on CRT PCB.
	Very noisy, unstable display	Replace C117
	PS squeals or shorted HOT	Ck. C534 220uf 16v near HOT Ck. C852 2.2uf or 3.3uf 400v on CRT PCB. HOT 2SC4436 can be replaced with 2SC3688.
	PS squeals	Pull 84v harness from CRT PCB. If squeal stops, ck for shorted color driver transistors 2SA1370 and 2SC3502. May also have R805, R815, R825 56 ohms open.
	Very noisy, non-op.	Replace these caps in PS: C18 47uf 50v C21 22uf 50v C22 1uf 50v C37 100uf 100v C38 10uf 160v
	HV, no display	G2 is normally about 400v. If the focus pot changes G2 significantly, replace FBT MSH1FCT31
8513-23	ALWAYS DO:	Replace C120 10uf 35v near LED. Resolder color pots and CRT socket Resolder AC socket to mainboard Resolder FBT pins
	No HV	R254 10 ohm 1/2w burned up, near yoke connector. Bad solder FBT pin #1 (yoke/HOT)
	Blinking LED	Ck. diode CR105 1N4936 or QFR207 in PS, diodes CR212 FR154, CR219, CR220 near FB, C223 .0068 or .0072 (green PCB) or .0047 (yellow PCB) 1600v for odd value CR101 1N5397 or FR155 3A 600v under switcher heat sink. May have low junction. If C202 100uf 160v B+ filter, or C218 10uf 100v goes bad R203 120 ohm 1w will burn up.
	Blown fuse	Bad posistor. Often rattles, with loose parts inside. C8ROH or MZ72-2-18. Shorted PS switching transistor. Shorted bridge rectifier BR100. R211 2.26k ohm 1% R101 0.68 ohm 1w R103 0.22 ohm 1w R104 4.7k ohm 5w R105 470k ohm 2w
	No display when warm	Bad solder at CRT socket
	Squirming at sides, squealing, HV shutdown	C120 10uf 35v near pilot LED Z100 Linear regulator AN5900
	Pincushion, internal hori & E/W adj pots don't work.	C225 22uf 50v
	Red dim or absent	Bad solder on red cutoff pot. Very common problem.
	Too bright	Bad solder at FBT pins
	No colors?	QM70-2 CA3046
	Too wide	C223 .0068uf or .0072uf 1500v
8513-72	ALWAYS DO:	Replace C313 3.3uf 160v off yoke connector vertical pin.
	Fuzzy	FB TFB-185A
	No HV, PS ok	Q402 MC1391P
	HV, no display	If no G2 voltage (pin "W" near right of FB), replace R447 (or R451) 3.3megohm 1/4w hidden under edge of FB near heat sink plate.
	?	Bad solder at yoke connector
	Whining, dead	C812 1uf 50v C815 4.7uf 50v C826 47uf 50v, all in PS Q801 2SD1402 Q403 2SC3883
	Whining or no vert sweep	If R320 2.2 ohm 1w (10 ohm 2w on some) is open, replace Q301 TDA1670A also. D302 RPG15J
	Pincushion or distorted	R330 33k ohm
	Jitters/shakes or retrace lines visible	C203, C204 47uf 50v
	Width problem	D406 R305 380k ohm 1/4w R306 36k ohm 1/4w
8514	Dead	Q560 HOT 2SD1849 Q571 2SD1850 Q801 2SD1402 R811 100 ohm 1/2w R816 0.33 ohm 1w FBT TLF-85680B
	No vert sweep	Ck. PS secondary resistors.
	Various	Bad solder everywhere in PS
	PS problems	C825 47uf 16v C810 22uf 35v C832 22uf 25v (or 100u 10v) C864 470uf 6.3v C865 10uf 50v C819?
	Streaking	Replace three surface mount caps on color dboard on left of mainboard. C301, C302, C303 10uf 50v.
8515	Dead	FBT
9517	Normal voltages:	G2 = 620v G1 = 95-130v
33G4577	Bright lines on sides of color bands.	Ck. ZD181 on rear right of mainboard.
39G2708	Whines in VGA	R950 2.2 ohm 1/2w open in PS secondary
59G7871	No power	Ck. C028 1uf 50v in PS under TDA heat sink.
	Width problems	Bad solder on Q602 2SB988 near FB.
Idek liyama
MF-5117, MF-5217	Noisy, no video	Replace C5B5 22uf 160v near rear center of mainboard. Remove transformer L5A4 and partially remove rear panel to gain access to it. Noisy during powerup is normal. Ck. also C5B4 2.2uf 400v, near transistors heat sink: leakage will be high. Ck. D966 RM2 14 1000v 2.5a
	Display 3" wide	Bad C-E junction on Q5A2 2SC3995 near FB.
Impression
See Helm
Infinity
IKI1428SV	Hori sync problems, delayed brightness on cold powerup.	Ck. C123 100uf 16v in secondary of PS.
KDS
VS-19	Dead	Bad solder at FBT C446 10uf 400v behind FBT
Kimsync
IV	Various	Bad solder at all blue mylar caps near FB, also bad solder @ FB pins.
F15LS	Hori ripple	If B+ and base of HOT is clean, bad FBT
KFC
CK-1405	HV ok, no display	Bad solder on CRT PCB
	Loses hori sync	Bad solder at J117 where the swivel base hits it
1428	No brightness control	Ck. R316
CA1528D	Display goes white instantly	Replace R146 near FB
Laser/MiniMicro
MM-1468J	No vert sweep	D402 R408 C408 100uf 35v If above ok, replace IC402 TDA2653A
6448/41	Dead, no LED	Ck IC901 STR58041 pins 2 & 4 for short. Should be open. If shorted, replace Q901 2SC3203 also. Ck R904 300k ohm, R911 & R912 (each 6 ohm) for open.
6448/52	Shuts down when warm, HV won't always start, won't do 800x600 mode.	Replace R321 3.3 ohm 1/2 watt (burned up one will be 1/4 watt).
	Flyback note:	If a 154-166B comes out, replace it with a 154-195A if you order it from CCS. Dalbani's 166b works ok.
Leading Edge
CMC-1412A	No power	Ck. C021, C022
CMC-1500BA	Similar to AST 1414AE1
CMON 1528V	Similar to AST 1414AE1
Leading Tech
400V	See Laser 6448/52
430V	See Laser 6448/52
450	No display or very dim	Ck. C925 470uf 100v
Link
	WARNING!	CRTs do not self discharge!
125	Various on video PCB	C410 4.7uf 50v NP C406 4.7uf 50v C409 330uf 50v C408, C401, C411 470uf 35v C412 (non-finned sink ver., Rev B) 22uf 50v
	CRT Caps to replace:	C101 220uf 50v C103 47uf 100v
	PS ills	C5 & C6 47uf 50v R1 .75 ohm 1w open D10 Zener 3.6v shorts
	Vert compressed, wrapped & wavy	Bad yoke. Really.
	Chirps w/good HOT	Ck. C407 mylar 153K
MC6	Similar to Wyse 150/160	Flyback sync wire that is banded on end is SYNC2.
MAG 800.827.3998
DX1495	HV shutdown immediately	C516 10uf 250v
DX15F	LED flashes	Replace Q502, Q508, D509
DX1595	Odd notched pincushion	IC101 TDA9103 (Phillipines) under CRT in front
LX1564	See Gateway CS1572
MX15F	?	Replace diode for 185v supply with MUR460. Old diode will fail if run for long @ 1280x1024
	No HV	Ck. all PS voltages, esp. 21v filter C330 1000uf 35v. Ck. HOT & 10uf cap by xformer
	Pincushion or too wide	C523 3.3uf 250v under aux board in middle of mainboard.
	Blown fuse	Arcing between PS switching transistor's heat sink and the 5w resistor next to it, through burnt glue. Remove glue, replace fuse.
	Ripple, noisy PS	R331 91k 2w in PS, changes value?
DX17F	No HV	Always: L105 TI-281-103-0 should be 4.5 mHenry, 90 rings. Ck for burned insulation. If HOT Q109 2SC4747 shorted, ck. or replace: C123 1uf 50v at coupling transformer. Q116 IRF740 or 2SK1378, tall heat sink at rear. Can replace with IRF840 or BUZ64. If shorted, R177 1 ohm 1w, off center leg of Q116 will be open. Q117 2SD799 for short. Less commonly: R181 120k ohm 2w, drifts high, near yoke connector. C164 220uf 16v at end of heat sink plate, C525 1uf 450v. R339 15k ohm C134 .0075J bad solder C137 .0068 bad solder C127 .39J 250v C124 .0056J 1600v C908
	Hori control doesn't work	Ck. C137 .0068uf 1000v
	Insufficient width	Ck. B+. Should be 63v +- 2v. Adjust via pots near rear of FB.
	Won't sync.	Ck. C126 .0027J
	Dim or brightness varies.	Remove glue on disk cap/spark gap near G1 on CRT PCB. Also remove glue around red G1 wire and nearby resistor.
	Dim, washed out	Ck. IC401 LM1203BN Vcc pins 1&28. Should be 12v. If less than 10.5v, replace IC403 LM340T12 at CRT PCB lower left.
	HV shutdown	HV too high. Mag recommends setting the shutdown level at 29.5KV and then easing the HV back to about 27KV. There are two pots in the corner of the board (R105/107?)
	HV Shutdown	Ck. IC902 TL082CN located near FBT & HV pot. This IC combines the HV pot and DC feedback line from the flyback and controls the 555 timer that controls the B+ FET. If pins 5, 6, & 7 all have near 12v, replace the IC.
	Jittery	Replace just L105
DX17S	HV Shutdown	See Mag DX17F note for HV shutdown & TL082.
	Dead or No HV	Q906 IRF740 B+ regulator ZD901 12v 1/2w D903 15DF-4 D527 1N4148 (in base circuit of Q512) FBT TF2-6V5-001-LA (not TF2-6V0-011-LB) B+ at FBT = 47v @ 31.5khz
DX1795	No HV	IC701 TDA9103 per MAG Ck. J709 10 ohm 1/2w resistor off pin 18 of IC701 for open.
	Pincushion	Q516 per Mag
MX17F	No video, no PS LED	Ck. -7v out of PS. If no voltage, ck. D311 & R362 0.22 ohm.
	Reduced width	Q907 IRF830
MX17H	No HV, clicking	Ck. Q503. If shorted, replace C503 1uf 50v and IC506 555 timer IC.
MX17S	Smoke or ticking	VR501 hori centering pot Q503 2SC4924 hori deflection Q505 IRF640 hori defl regulator C515 4.7uf 250v
	Pincushion	Q506 2SD799
MX21F	No Hori sweep, vert line.	R535 10 ohm 1w Q503 BU2525AF, sub BU2527AF C503 1uf 100v
	No HV	Q505 IRF640 Q503 BU2525AX Q506 2SD1088 R514 2.2 ohm 1w
XJ700T (V7T001) FCCID: IAWV7T001	Dead, ticking	D310 or D311 HER30 in PS secondary
Magitronic
C-SV1428A	See Helm IM1428SV
Magnavox
See Philips
Maxtech
XT-4800	Dead or LED blinks	D124 31DQ06 in PS secondary. Schottky 90v 1a
MGC
1406, 1406E	Dead, squeals, hisses	C135 (or C141), C142 (or C139) 470uf 16v in PS
1406 only	Color missing	Much bad solder on CRT PCB
Other models	See Edison
Micron
15FGx	See ADI LM-1564
M17FGx	See Mag DX17F (really)
Mitac/Magitronic
AL4050PD	Dead	R940 470k ohm
AM4020	No power	Ck. Q901 D907 C907, and fuse.
A1775	No power	Replace: C108 100uf 25v C123 100uf 50v C135 47uf 25v C127 10uf 50v C119 1000uf 16v all in PS next to transformer. Bad solder at FB pins 12 & 13, at PS connector W104.
	No HV, no B+	If resistor R113 1 ohm 1w under PS connector W104 is open, ck. Q420 BU2527AX.
L1564PDM	Jittery, static	C204 2200uf 16v in vert sweep circuit
L1782	Various	Q420 BU2525AX hori sweep driver 2SD1027 under CRT PCB, screwed to lower pan R498, may be 10 ohm 1w? Burned up, near L403.
M1450PD	Chirps	Q501 BU2508DF HOT C509 10uf 50v NP C508 100uf 16v
	No pincushion adjustment	C534? 1uf 50v Q504 2SD1138 R560 & R561 500 ohm 1/4W
	Dim	Scope heater line. If square wave at input freq, replace C932 470u 16v
	Entire picture shifts down 1/2"	Replace Q907 IFR640 (2SK2161?) with IFR830 or equivalent. C918 47u 16v
	Vert control doesn't work	Q201 2SC945 TO-92 near TDA, right front. R207 1k 1/4w
	Colors flickering/missing	Bad solder at unlabelled 6 wire connector from rear of mainboard to CRT PCB
M1448R	Hold down on power-up	Ck. C108 ______ in PS & glue
SV1428A	HV shuts down	Ck. C424 near FB, Ck. C430
	No video or raster	Ck. R437
SV1448	See Helm CM1448M
MM1495I	See Helm CM1448M
1564PDM	Pincushion	Ck. C525 10uf 50v
Mitsuba
66267	Chirping	HOT Q??? 2SC3883 C731 100uf 25v Bad solder at FBT and other locations
	Loses vert sync in some modes	Hsync is being bled to Vsync line to TDA1675 by U612 SN74LS86N at front of mainboard. C706 1uf 50v in vert circuit.
Mitsubishi
HA3905	HV shutdown	Q951 2SC3310 in PS Bad solder IC951, IC952 in PS HOT 2SC4125 shorted
FW6405ATK	Poor degaussing	Bad solder RP901 posistor
	?	Bad solder R907, R904, D912, FB pins 11 & 13
HL6905	Loss of sync, variable pincushion	Ck C922 in PS 22uf 50v
	Dead, shorted C3688 & D921 on side heat sink.	Bad solder on connectors J602, J508, J601 Can be reached by removing lower pan.
	Various, whining PS, HV comes up then dies.	PS regulation. If you bench check the voltages with PS unloaded, the B+ & 185v will be high, but the 12v, 5v, & 24v should all be very close. If not, replace IC952 LM7805 (5v), IC 953 LM7824 (24v). Ck. also all picofuses on PS. The 24v circuit is picky; tolerance is about 23.7 to 24.2 ! B+ should be about 60-85v depending upon screen voltage setting, and should vary almost not at all when brightness & contrast pots are varied.
	Connector table:	C4123 goes to J601 C3688 goes to J508 PCB-Coil (Blue & Brown wires) goes to J515 2SD1138 goes to J514
	Intermittent jittery	Ck. plastic of yoke connector for heat damage.
HL6945	PS dead	Replace IC991 STRS5841 9 leg. Ck. C941 2.2uf 450v
SD5700C	Pincushion, hori wrap	Ck. B+. Should be about 65v at 640x480 If more than 90v, run! Mitsubishi repaired one we sent them, and made a note that it was a bad EPROM somewhere.
XC-1430C	No LED, squeals	Ck. D952 for short. Ck. C556 10uf 100v near FB. Ck./replace three caps near PS osc. C908, C909, C913
	?	Ck. D904, D925
Nanao 310.431.5011, 800.416.3539 faxback, http://www.eizo.co.jp/welcome 310.431.4811 repair dept fax
	Control panel Lock/Unlock: F550i, F750i, Old T560i & T660i	With picture displayed: Leftmost button & Blue/Pincushion for 3 secs.
	Control panel Lock/Unlock: New T560i & T660i, all 'F' series with "-w"	Pincushion (below 'G') & brightness for 3 secs.
	Control panel Lock/Unlock: T2-xx & F2-xx	Degauss while power-on
Flexscan 9070?	No HV	Replace STK78617 on side dboard
	Odd display symptoms, static	Replace all caps on side dboard
MA-1781	PS cycles	D64 in PS
NCR
0261	See AST 500902-001/SVGA
NEC
XL (see also 5D)	Too bright, control doesn't work	Bad solder R969 on 2"x3" PCB at upper rear
I (JC-1401)	HV OK, no heater voltage	Ck. R780 4.7 ohm on video PCB. If open, replace IC702 STR2005. Ck. TR782 D882.
	No HV, C1 = 12v	If C1 (B+) comes up to 120vdc with FB disconnected, replace FB 47105626
	Blown fuse, bridge OK	See the PS list for II (JC-1402)
II (JC-1402HMA)	Blown fuse, bridge OK	Ck IC601 STK7406, IC602 STK7404; pins 15/16: should not be shorted. R623 4.7k or 5.6k ohm R624 1 ohm R632 1.2k ohm R614 2.2k ohm R631 2.2k ohm Ck. bad solder on PS sec. filter caps. Replace all small caps in primary: C620 22uf 100v C615 (JC-1401) 4.7uf 100v C615 (JC-1402) 2.2uf 50v C610 470uf 35v C616 470uf 35v C611 220uf 25v C617 220uf 25v C609 4.7uf 100v CP-E475100 PS Voltages: C1 = 84 C2 = 18 C3 = Gnd K1 = 85 K2 = 24 K3 = Gnd K4 = Gnd
	Dead	Ck. transistor TR5C2 near rear for shorted outside pins.
	No HV	If B+ (C1) is way low, like 20v, ck. for FB heating up. If so, replace FBT 47105637
2A (JC-1403)	Fuzzy	CRT bad or FBT 47105647
	Dim display, dark 1" wide vert bands	Replace these caps on CRT PCB near M51387P: C701-3 47uf 25v C707-9 2.2uf 50v C734 22u 160v on opposite side
	Pincushion problem	Replace IC402, ck. C412
	Vert foldover	Ck. bad solder CND6
	HV too high	Ck. T501 for short
	Brightness pot isn't linear (steps)	Replace Q704 2SA733 on CRT PCB
	Various	Cracked PCB near FB
	LED dim, no HV	Ck. for about 16v on IC451 pins 9, 10, 14 on daughterboard. If not present, R6A1 2.2 ohm 1w under CRT near dual jumper wire connectors will be open, and vert processor uPC1498H will be shorted on pin 3.
	Various	Bad solder where dboard on right mounts to mainboard on bottom.
	Note: heater voltage is pulsed DC. No diode.
3D (JC-1404HMA)	HOT 2SC3486 shorted or gets hot.	Replace also Q519 2SK758
	Won't sync	Bad solder C501 under CRT, ck. nearby also.
	Dead	R625 10 ohm 5w in PS open C561 1000uf 35v
	No HV	Ck. Q522 2SK752, sub 2SK758. HOT driver.
	No HV	Ck. IC401 HA11423 pin 15 for 9v output pulse. If at 10v steady, ck. Q2002 2SC1318 for 24v on C, 18v on E. If E is low, replace Q2002. If 12v missing at TP550 at left rear, ck. R536 33 ohm 1/4w open, 1" left of vert proc heat sink.
MacSync	Similar to AT&T CRT329D, NEC 2A
? (JC-1405HMA)
? (JC-1431VMA)	Dark vert line on left, about 1" from edge	C825 2.2uf 160v filter for 150v line, near connector ?, connected to D808
3FGx (JC-1532VMA)	Screen brightness changes	Bad solder on flyback ground
	Shorted yoke driver	If yoke driver Q516 HPA72 is shorted, ck. Q525 2SK758, replace Q516 with HPA100 (10a 1500v). Mount by adding extension wires to clipped-off old transistor leads, bolt HPA100 to heat sink using existing hole at upper right.
3V (JC-1535VMA)	Colors drop off at different levels, ghosting to right.	Replace LM1203AN (Phillipines) with another sourced 1203.
4D (JC-1601)	Shuts down or hori driver shorted.	Q560 2SC3688 Hori defl driver on FBT heat sink Q544 2SK699 hori defl predriver Q5P0 2SK758 hori defl B+ reg. on sheetmetal heat sink in front. Q5T0 2SC3685 HOT on FBT heat sink Q5U2 2SK758 on sheetmetal heat sink in back. C541 100uf 35v next to Q544 This has proven to be a difficult model to repair.
	?	C613 47u 63v in PS C629 47u 200v in PS
4FG (JC-1531VMA)	Pincushion, variable brightness, or HV comes up only for a couple of seconds.	Caps on mainboard under PS leak on traces. Replace (all under PS): C561 = 470uf 35v C556 = 470uf 35v C559 = 47uf 35v C557 = 1000uf 10v C562 = 220uf 16v C410 = 100uf 35v C407 = 2200uf 35v C401 = 220uf 16v C404 = 220uf 35v C503 = 100uf 35v (near h-yoke connector C555 = 100uf 35v Remove transistors & transformer as necessary to clean traces with Flux-off and hard eraser. One or more traces will often need to be bypassed with wire. Ck. especially the trace under R556 & ZD554.
	Jittery vertical	Bad solder at IC401 LA7837
	HV Shutdown	C557 = 1000uf 10v
	HV problems	Q505 HPA100 on side heat sink plate Q510 IRF9610 (double check! or replace with IRF9620) C503 100uf 35v near h-yoke connector C404 220uf 35v near LA7837 vert processor
	No HV	Q554 B772 (green) shorted, located near C555 & vert processor.
	Poor focus	Rejuv often improves focus dramatically.
	Over bright or raster only	C793 = 470uf 16v Located on L-shaped board next to CRT board. Leaks and eats traces.
	Variable brightness or goes dark	C792 100u 25v. Located under C793. May not show very high ESR, but replace it anyway. Ck. for leakage on traces.
5D (JC-2002VMA)	Too bright, control doesn't work.	Bad solder R969 on 2"x3" PCB at upper rear
	No HV or HV shutdown	Cracked mainboard from FB to rear edge.
	?	Q4TOB 2SK1271 shorted.
5FG (JC-1741VMA) & 6FG (JC-2141UMA)	Dead	HOT shorted, holds down PS Q5G6 2SK758 on mainboard Q581 2SC3998 on PCB above FBT with heat sink.
	Display is 3" high and centered, or pincushion, or vert not adjust high enough.	Problem is on dboard, 1.5"x7" on PS side of mainboard. For pincushion problems, try replacing: IC5S2 = XRA10358/LA6358, 8 pin DIP IC5S3 = XRA10324/LA6324N/LM324, 14 pin DIP IC5S4 = XRA10324/LA6324N/LM324, 14 pin DIP For scrunched vertical, try replacing: IC5G1 = C3404C, 14 pin DIP Other parts on dboard: IC5S3 = XRA10324/LA6324N/LM324, 14 pin DIP IC5S5 = 4200D JRC 2022D, 8 pin DIP IC5G0 = XRA10393 or LA6393D, 8 pin DIP Q5S1 = 2SA933, Mini TO-90 Q5G1 = 2SA933, Mini TO-90 Q5G3 = 2SA933, Mini TO-90 Q5G2 = 2SC1740, Mini TO-90 Q5G0 = 2SC114, Mini TO-90
	No HV	Ck. Q503 2SK806 near small FB predriver.
	HV shutdown or video fades like loose heater connection	Ck. C8C3 330uf 16v on upper left of video process board, under top of digital board PWE-330. It leaks and etches a 12v line underneath.
PC-KD854N	Japanese model, requires special video card, apparently runs somewhere between 21-29khz.
XV14 (JC-1433VMA)	Width control inop, pincushion	D504 near FBT, replace with MUR4100 or equiv. Note: shield around FBT is VERY sharp!
Next
?	PS crowbar (chirps)	C33 mylar 123J1600v HOT BUW13A and PHBUV26A on large heat sink C68 C92 C60
Nokia
447E058	No Hori sweep	Probably C212 mylar? Near FB. No idea of the value.
Optiquest
1000 (CM1448M)	See Helm CM1448M
4000	See Acer 7076I
For other models, see ADI
Orchestra
Trumpet-14	Streaking	C623 1uf 250v C629 1uf 250v C634 1uf 250v C624 1uf 250v C625 1uf 250v C626 1uf 250v
	Various	Bad solder on FB pins.
Packard Bell
1020	HV hits hard, then shuts down	C430 10uf 160v
1020 (FCCID DK4M1448)	HV hits hard, then shuts down	B+ too high: C334 100uf 200v near FBT
RC1511/12SL (RC has no video cable; non-RC has captive video cable)	Reduced display width, no pincushion or width adj.	Bad solder on Q405 TIP42C. Ck. R445: 85 ohms works, correct value unknown. Reflow yoke connector, Q714, Q715.
	Loses sync when changing resolutions	Replace I701 Z0861404PSC Zilog 40 pin
Spectra 305CD	Color problems	Replace LM1203
1401S/1402	No HV	If no osc. at base of HOT, ck. Q910 A1273 near center of mainboard. R612 1 ohm 1/2w near vert osc TDA4866 D403 zener 5v
1411SL	PS cycling	Reflow P701 yoke connector. Ck. secondary PS diodes D910, D911 RU3C 600v 1A.
1412SL	No display, or color problems	Replace LM1203AN (Phillipines) with another sourced 1203.
8524	Various	Flybacks go bad (fuzzy after warm, draws too much current and gets hot). Replace only with TFB-200A, NOT 200C.
8529	Too bright, white screen	G2 at CRT about 600v? R449 1.2 megohm is open. In front of FBT. It's the ground for the G2 divider pot.
8537	Dead, blown fuse	See note in Apple section about posistor DGC3RO8M
8539	Too bright, white screen	See fix for model 8529
8531V	Similar to Laser 1468
8541VGG	See Laser MM-1468J
85117SVGM	See Viewsonic 7
Panasonic
C1381	Dead, fuse ok	Q804 2SK1351 in PS
C1491	Dead, fuse ok	Bad solder R804 in PS
Philips/Magnavox
1557AS	Mild hori ripple	Ck. Cap @ 2154 68uf 250v
Various	Various	Ck. for broken mainboard around flyback. Remove black PCB spacer.
C4J420-0473	HV shuts down	Replace C2614 1uf 250v
CM9032	No power	Ck. R111 for open
CM9089	Loses sync	Replace IC7801 MC14538 dual multivibrator under bezel opposite of power switch.
CSJ5209/743	Raster, no video	Ck. Q513 for short. Ck. bad solder on 7108 5v regulator near AC plug., 7523 on HOT heat sink, F801 (wad of white wires) below black plastic board spacer.
	Chirps	If HOT BU2508a is shorted, see note under Apple 4222. Ck. 8512 BY329-1200 TO-92 style diode. May not be shorted, but will have low reverse bias. If diode is bad, check: 3119 1 ohm 1w 2119 100uf 63v both in PS sec near green ground wire. Note: if you disconnect FB pin #4/B+, cap 2517 10uf 16v will blow!
	Dead or chirps	Scope pin 3 of 7105 UC3842 (current sense). If pulsing above 1v, ck harness F601 (wad of white wires) pin 1 (rearmost). Voltage drop should be charging". If it's about .6v, look for shorted transistors on CRT PCB, esp. 7722 BF422 & 7723 BF423.
	Picture tall & narrow, B+ low	Bad 3119 1 ohm 1w and 2119 100uf 63v in PS sec. near grn gnd wire.
CM2015D1	No HV	Ck. bad solder on 7153 5v regulator near AC plug, 7916 regulator (?) near FB at back of chassis.
	Chirps	Ck. 6618 diode pack at FB heat sink.
Power II
3E	See AOC CM-335
4A	See AOC CM-336
CM1414E	See Helm CM1448
Princeton
UltraSync Series	Signal cable pinout	DA15M --> DB25M 1 = 2 2 = 4 3 = 14 4 = nc 5 = nc 6 = 3 7 = 5 8 = 15 9 = nc 10 = 10 11 = 12 12 = nc 13 = 16 14 = 17 15 = nc
Proton
GM-1560	Chirps	C805 150uf 400v main filter cap leaks badly
PM-1448A	Dim	Heater voltage low C820 220uf 16v in PS sec.
	Color missing	Burnt solder on CRT PCB
Qume
QM890 (Mitsubishi HL6905 chassis)	Dead, PS cycling	Ck. C330 220uf 35v in PS primary
Radio Shack
VGM-470	See AST N461D
Proview
PS-707 or 765 (FCCID: IJE765)	See EMC SA-770
Radius
0356	Too wide, dim	C420 22uf 250v
? TPD	Sync problems	Ck. R432 47k ohm, R423
	No contrast or no video	Replace LM1201N on CRT PCB
	No power	Ck. Q405 C460 Q453 on HV PCB
THN9175SKTKW	No Green	IC331 LM2202
Relisys
TE1438	Raster ok, no display, no LED	Shorted IC602 L7812CV on mainboard, open R632 42 ohm that feeds it, shorted Q101, Q201, Q301 2SC1906 on CRT PCB. May also have shorted LM1203.
TF-1560	?	C532 10uf 250v near FB
Royal
CN1775	See Mitac A1775
Sampo
KDM2077	Chirps	Ck. Q714, C718
Samsung
CSF7487	The DB9 video connector requires special cable, not NEC or Sony pinout.
	No HV	C449 100uf 35v
CQA4147	HOT Q403 shorted	Q403 2SC5386 (CID?) B+ regulator IRF9610
CVM-4867T	Pincushion	C111 220uf 25v C206 10uf 50v C207 .47uf 50v C208 4.7uf 50v C210 4.7uf 50v C211 10uf 50v C223 .047uf 50v mylar C224 .047uf 50v mylar C280 10uf 50v C311 100uf 25v IC202 LM358
CSJ4927A	Size controls don't work in 800x600	Replace large dboard IC202 Part No. SSP02A
CVM4967T	Pincushion	Replace IC201 SL405 28 pin IC under tube and C207 0.47uf next to it. Ck bad solder on vert deflection IC.
CVP4581	Vertical sync problem	If output of TDA is two or more times input, R306 33k off TDA2653A pin 13 open.
7571	Shuts down immediately	Ck. R654 in PS
	Shuts down after a few seconds.	Ck. IC601 STK7408 pins 15 & 16 in PS. If shorted, do NOT replace with STK7408T; it will NOT work. Also ck. R601 18 ohm 5w for open.
	Pincushion problem	Ck. R326
	Blown fuse	Ck. IC601 STK7408 pins 15/16 for short. If shorted, Ck. R601 15 ohm 5w near filter caps for open.
	Hori blanking problem, will shift with vert control	Replace Q504 2SC1008 and Q505 2SC2323 TO-92 on mainboard
L4571 mono VGA	No display, or no hori sweep	C517 330uf 50v
SM483C	No HV, B+ ok	If PS voltages ok, replace IC203 GL1151 hori. oscillator
Samtron
SC-428PS	Narrow, width pot doesn't work	Bad solder Q406 KSE800 near FB
Sceptre
CM-6K	See Hyundai HCM-401
E461D	Front panel: to lock in settings, press and hold both hori width buttons for a couple of seconds. See AST N461D
EM-1417	Various	Replace C615 near FB 2.2uf 35v. Almost always bad. Ck. R616 330 ohm; usually burned up.
Seiko
CM-1440C	Signal cable goes on J001
	No HV	Bad solder on HOT & HOT driver transistor (and other places)
CM-1450C	Signal cable goes on J001
	Shuts off	Bad solder: R906 18k 2w in PS Hori center pot Q670 2SD1658 near center of mainboard Q668 on heat sink near FB Q930 with clip-on heat sink next to TP10 at center rear of mainboard. Connectors J001, J002, J003 on rear PCB
	Dead	Q901 in PS on heat sink R902 22 ohm 5w in PS open
Sevenstar
SM483C (Goldstar)	Various	Ck. for cracked traces; common with this mainboard
SIIG
PMV14VC	See Gateway
Smile
CB1716SL	Intermittent color	L404, L405, L406 1.1mh inductors get weird. All on CRT PCB
Socos
CM-1402	No HV	Centering pot burnt 403 shorted Q405 C419 .56J mylar
Sony 800.222.7669, TS: 800.326.9551, service 342.5721
CPD-200SX	Smoking, leaking	C907 330uf 400v PS filter
CPD-1302	Signal cable pinouts	DA15 VGA to DB15? 1 -> 5 2 -> 8 3 -> 1 4 -> 2 5 -> 3 6 -> 11 (or 10 & 11?) 7 -> NC 8 -> 13 9 -> 14
CPD-1304	?	Bad solder R217, right front. Can resolder without removing mainboard.
CPD-15F13	HV shuts down, shaky display	Bad solder @ HOT Bad solder at dboard pins near front.
	Chirps	Ck. Q503 IRF9630, Q507 C5149
	LED flashes once, No HV	Heat sink for IC502 hits CRT, cracks PCB
	Dead	If PS sec voltages are present, ck. R612 If open, ck. Q529, D623, Q603-Q606, D622, D628
CPD-1604S	Dboard part No.: A1346069A (or 991099931) $172.33 Spring '96.
	No power or squeals	Ck. C911 10uf 63v in PS Bad solder R409 between sweep driver & HOT. All below on dboard near FBT: C309 10uf 35v C310 47uf 16v C338 4.7uf 35v NP C332 470uf 16v Replacing these fixed one for the B+ crowbar squeal, even though their ESR measured OK.
	Jittery or vert problems	Bad solder at Q412 & IC201 vert processor
	Pincushion/trap problem	All on dboard near FBT: C334 4.7uf 50v C331 4.7uf 50v C330 10uf 35v C336 10 uf 35v C313 1uf 50v C349 10uf 35v C346 10uf 35v C328 10uf 35v If problems persist, TEA2031A
CPD-1730	No display, HV OK, or jittery, hori lines	Ck. bad solder @ vert processor IC202 LA7838. Check solder on D202, Q201, Q202 also. Mainboard must be removed to access all of these.
GDM 1936	No HV	Q401 2SC4532 (sub 2SC5332) PS101, PS401 1a pico fuse Q204 2SC3997 Q402 IRF9630 Q217 IRF9620 C405 ?
GDM 1962	Fuse blown	D201 in PS
GDM 1962B	HV shutdown after a second	Ck. for shorted Q315 Q307 Ck. C330 pico fuse PF302 blown
GDM 20E20	HV shutdown, LED flashes orange	Q507 IRF9630 Q508 C3997 PS501 pico open Will run 640x480, sync on green
GDM-2038	Vert rolling	C207 1uf 50v on dboard near FB
	Display moves right when warm	C217 1uf 50v on dboard near FB. If still moves left/right with heat, try replacing IC101 LA7856
	Hori distortion halfway down	C240 1uf 50v on dboard near FB.
Standard Technologies
ABO-428-SVGA	Shorted HOT 2SD2125	Replace also C417, C418 100uf 25v
Sun
FC16AS	Filament ok, HV ok, no display	Replace C19 in vert circuit
	?	Ck. bad solder @ FB
GDM 1962B	See Sony GDM 1962B
GDM 20E20	See Sony
Supermatch
7176N (Acer version)	See Acer 7176N
Supertron
?	Screen flashes	Ck. resistors 27k ohm, off pport/pot (?) connectors.
	Pincushion or width problems	Try replace TEA2031 8 pin IC
SV1482	HOT shorted	Replace C318
	PS dead, fuse blown	Q902 2SC3459 sub 2SC3460, switcher Q901 2SD400 giant TO-92 switcher driver C908 10uf 50v C909 47uf 50v
ST1496	Loses sync when hot	Replace ______ TDA9102
ST1497	Shorted HOT	C219 mylar .006 1500v C217 10uf 35v coupling cap Bad solder C214 mylar
Tatung
CM1380F	See IBM 7534
CM1496	See IBM 8513-72
Taxan
640/650x 17"	Blown fuse K40? near yoke	Flyback shorted. F31 0053
	2SC3886 shorted	Replace also C202 10uf 250v Remove glue off everything possible in area
850	Width trouble	Replace Q405 C413 D405
Techmedia
TCM-1400G	Noisy or no display, HV shutdown	Ck. C121 220uf 16v in PS.
TCM-1448G	Noisy or no display, HV ok	Ck. C121 220uf 16v in PS.
Televideo
955	WARNING!	CRTs do not self discharge!
	Dead PS	Ck. Q1 (MJE13007 or 2SC3039 or 2SC2898). If shorted, Ck. D5 diode 1N4935 600 PRV 1A. If either is shorted, replace Q3 (2N2222A). Ck. R8, R9, R10 (1.2 ohm). Replace if open. Ck. R3 (22k ohm, 3w) for open. Ck. D1 1N4007
	Low vid voltage (10v) and low logic voltage (14v)	Ck. C16 680uf 16v Replace Q2 (2N4124 or 2N2923 or 2SC1815)
	Component list	ZD1 = 1N752A 5.6v 1/2w D12 = 1N4004 600v 1A (replace with 1N4007 1000v 2.5a) SCR1 = TYN058 or C122F or MCR218 SCR-50 VRM, 10A D5 = 1N4935 600 PRV 1A R8, R9, R10 = 1.2 ohm R13, R14 = 22 ohm
	No vert sweep	Ck. R614 3.3 ohm 1w for open
	After CRT replacement, raster is shifted to one side	Adjust one ring on yoke
	Various display problems (note: there are at least two variations of this PCB, and the component numbers/values are not the same)	(Vertical focus pot version) Replace: C305 = 220uf 25v C306 = 6.8uf 25v NP C509 = 47uf 25v
	Dim	(Hori focus pot version) Replace C305 220uf 25v
Trust
CM2228NL	Dead	R804 27k open
Touch
CAC14MG	Display too wide	Replace C445 10uf 160v
CAD14NF	Dead	Ck. Q802 BUZ90A PS switcher Ck D808, D8605 600v 1A (replace with QFR207) C821 100uf 35v C813 100uf 100v All are on secondary of PS transformer.
TD1428A	See AST 1414AE1
Trion
CSK5877A(NO)	Geometry problems	All geometry adjustments are accomplished via a programming port to the Toshiba TC89101P
Uniron
CM-1428A	Color problems	All caps on CRT PCB will be fried C525 10uf 250v C517, C519, C522 4.7uf 250v C512 4.7uf 50v NP C513 10uf 50v C504, C505, C506 2.2uf 100v Ck. driver transistors C3788 for short
Viewsonic
1/7031	Dead	Replace C703 220uf 100v
1782-2 17"	Blue weak or dead	IC1302 EY07P4C3 15 pin IC
4e	Dead	Ck. D304, D305 near FB for shorts. Will hold down PS.
	Pincushion or width problems	Replace IC304 LM339N and Q325 2SC2235
5e	Pincushion or vert problem	Replace C213 2200uf 16v
	Pincushion or width problems	Replace IC304 LM339N and Q325 2SC2235
	Dim	Bad solder on PS connector in PS, PS transformer secondary, CRT socket. Good practice to reflow every time you have the opportunity.
	Shorted HOT	Replace C336 0.22uf 50v coupling cap
6	No vert (?) sweep	TDA shorts & burns out resistor. Replace R863 1 ohm 1/2w in PS & TDA1675A
6e/7034T	Not enough hori sweep, narrow	Replace Q208 2SD669A
	PS chirps	C609 100uf 50v in PS
6fs	No power or Pincushion	Ck. Q132, D132
7x	?	Ck. (4) 4.7uf 400v caps on vert mount aux. board on left side. They blow out.
	Dead	Bad solder on On/Off switch. Test by bypassing switch at brown harness behind switch.
	Dead	If no PS outputs and 170v on filter cap, replace IC881 STK750-010
	No Hori sync	Ck. IC520 MM74HC221AN pin 7 for inverted spike, about 5v, that is the same freq. as input hori sync signal. If not present, replace IC520.
14ES (1448ES-1)	Dead	Bad solder L602 in PS primary.
	Dead	R603 33k open
17GS (1769GS-2)	Vert foldover/distortion	D401 1N4001 next to vert output IC
21 (2182)	No vert sweep	Bad solder on yoke PCB and IC402 TDA LA7838, which is on CRT PCB.
	Shorted HOT Q550 2SC4288A	Ck. D351 RP1hn on mainboard near FBT.
N4200W-2	Dead	24May2015 ALS: Lots of bad small caps on PS board PSM241-404-1 Phihong: C703, C806: 1uf 50v C119, C801, C803: 22uf 25v C108, C502, C603, C605, C801: 47uf 50v None of the larger caps were bad on this one.
VTech
N-1428	Front panel: to lock in settings, press and hold both hori width buttons for a couple of seconds. See AST N461D (similar but not identical)
Other models	See Laser
Wen
JK1461	Dead color	For Blue: Q211 2SD756 Q212 2SB716 R232 10 ohm C240 1uf 160v For Red: Q207 2SD756 Q208 2SB716 R228 10 ohm C238 1uf 160v For Green: similar in circuit.
	Blue level drops off to right	D205 1N4148
	Cutoff pot doesn't work	For Red: D220 1N4148 Other colors, similar in circuit.
Win
1433	Brightness fluctuates, too wide	Replace C333
JK1461	Color problem (see also "Wen JK1461")	Ck. 10 ohm resistor, D756, D716
Wyse
30	Various problems	Always replace: C110 10uf 100v (in PS) C205 6.8uf 50v NP C212 10uf 250v C209 220uf 63v ALWAYS! C208 470uf 50v C202 1uf 100v C211 47uf 100v C306 10uf 100v C309 100uf 25v
50	Various problems	Always replace: C105, C202 10uf 50v C107 47uf 50v C109 1000uf 50v C110 330uf 63v C112, C203 220uf 63v C114, C117 100uf 50v C121 680uf 16v C214 100uf 25v sometimes axial, under FB C206 4.7uf 50v NP
	Notes	D102 is Schottky 60v 5a; forward bias measures .020 in circuit, .120v out of circuit normally. If Q102 PS switcher (2SC2898, replace with 2SC3150 or 2SC2979) is shorted, replace Q101 2N2222A also. If you don't replace the optoisolator U103 4N35, use a variac to bring up supply AC while monitoring voltage at TP1 or cathode of D102. Should go up to no more than 8v, then regulate back to about 5v. If it rises above 8v, ck voltage at TP2. Should step to 23.5 quickly, and not change. If it drops off suddenly as you're bringing up the AC, replace the optoisolator. The optoisolator cannot be checked like a diode. Pin 10 on flyback is normally shorted to 1,4,5,7,8,9 TP1 = 5v, TP2 = 23.5v
	Display pulsates in an out	Replace U101 L200C WY-8043224
	23.5v pulled down, 5v ok	If 23.5v is OK with logic connector pulled, suspect flyback. No. 420007-01 or 80-004-08
	Hori squiggly, ripple or static	If all caps ck ok, replace flyback
	Display moves left/right with temperature change.	Replace C202 10uf 50v first. If persists, replace Q202 BU806
60	FBT is 420016-01B
	PS won't fire up	Ck. R101 330k ohm for open. Replace with 2W Ck. R118 3.9 ohm 1w near fuse.
	Blown fuse	Ck. Q101 2SC2979. If shorted, ALWAYS replace Q102 2N2222 and IC101 4N35 optoisolator at the same time, NOT one at a time. Do NOT use Motorola 2222A metal cap transistors, as they will not handle the input voltage and will break down, causing the 5v to go to 8v or higher, zapping the logic board portion.
	PS crowbar (squeal, no HV)	If HOT Q202 (2SC3591, 2SC2898, BU406) is OK (check out of circuit), C203 .015J 400v blue mylar is shorted, located next to HOT.
	Raster, poor display, brightness won't turn down	Ck. D105 for open. Replace with QFR107
	Hori wrap or dim or no display	D203 UF4007 or QFR207 or QFR307
	Vert compression/expansion	Replace: IC301 TDA1175 C309, C311 100uf 50v C211 47uf 160v C306 22uf 50v
	Other trouble parts	C202 1uf 160v C208 470uf 35v C209 220uf 50v C212 10uf 350v C205 3.3uf 50v NP R214 220k 1w
	Screen size changes with brightness control	If lots of vertical size change, suspect PS 12v+ changing to TDA. If 12v changes more than .1v with brightness change, replace IC101 4N35 and possibly IC102 TL431CLP. No fix for hori size change
	PS 5v+ above 5.3v	Try replacing transistor IC102 TL431CL See "Blown fuse" for note on 2222A.
	Screen shifted left, changes with heat.	Replace HOT Q202 with BU406 or 2SC3591 (but NOT 2SC2898?)
	Some pixels missing in the same chars every time	Replace U16 AVASEM/9047 192017-02
150	Notes	Gray harness is brightness, two wires, goes to mainboard. Brown harness is contrast, three wires, goes to CRT PCB.
	?	C315 4.7 uf 250v center of mainboard.
	PS won't oscillate	Ck. C107 mylar .22uf 100v
	PS won't regulate	Q102 2SC1213, won't measure shorted but leaks enough to push the 5v way too high, like the Motorola 2N222 problem in model 60.
	Hori. linearity problems, wrap	C209 22uf 50v C201 100uf 50v Both near coupling transformer. If you've had the fixed hori width coil out, ck. polarity. If backwards, chars will be scrunched on the right side of the display.
	No keyboard I/O	Ck. R23, R25, R27 47 ohm 1/4w near line drivers Ck. U10 MC1588 or SN75188: Pin 1 = -12v Pin 14 = +12v Pin 2 = Input 5v data pulses (when keyboard operated and you're not in the setup" screen) Pin 3 = Output +-12v pulses
160	On powerup, second beep is on continuously.	5v too low. Ck. 4N35 optoisolator.
185	Needs its own keyboard; 60 won't work.
325	Squeals	FB shorts and case is frequently bulged. To remove mainboard, CRT must often be removed. HOT connector should have orange wire on top, gray on bottom.
	PM	Replace R526 0.47 ohm on CRT PCB with 1.5 ohm 2w, per Wyse FEB 460.
350	Top line of characters are cut off	Replace C212 4.7uf 160v
530 PC mono	Will not have HV without a signal present (no hori oscillator).
655 & 738	See Amdek

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Revision History
24May2015: Added Viewsonic N4200W-2
20Mar2015: Fixed up minor cap values for HP L1906 v3 C805.
Added v4 version.
23Nov2013: Changed: HP L1906 v2: Confirmed C805 location, changed "C905" to "C805".
16Nov2013: Added: HP L1906 section with pictures.
04Mar2019: Removed references to OS/2; added "" encapsulation of various tag parameters.