[TechAssist] Re: 2nd Post repeat failure STK 730-30 in RCA CTC 187CL3
- From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 1 Jun 2003 23:51:48 -0400
Bill:
Check the filter cap for that line C4107. Also check or replace T4101, C4123
(off pin 4 of U4101), C4103 (off pin 6 of U4101), C4122 (off pin 1 of
transformer T4101), and C4105.
Here are some other tips for that chassis series.
TC187 REGULATED B+ TOO HIGH REPLACE T4101
CTC187 PICTURE TOO WIDE WITH A LINEAR PICTURE CHECK YOKE RETURN CAP C4403
CTC187 NO TUNER VIDEO CHECK Q2705
CTC187 NO OR POOR VERTICAL CHECK SOLDER AROUND R4868
CTC187 NO USABLE SIGNAL MESSAGE WHEN OFTEN IS CHECK C1402
CTC187 NO VIDEO CR2902
CTC187 ARCING/PULSING NOISE CR3102
CTC187 NO AUDIO CHECK SERVICE MENU SETTING P25. IF #15 REDUCE SETTING TO 13.
(BAD EEPROM)
CTC187 DEAD CHECK FOR COLD SOLDER IN THE AREA OF E4404
CTC187 NO OSD IF NO CHANGE IN VOLTAGE AT PIN 39 OF U1001, CHECK TRACE BY
JW436 & R2733
CTC187 DEAD CHECK R3140
CTC187 NO COLOR ON CHANNEL 3 ADJUST L7305
CTC187 SHUTS DOWN REMOVE FLUX BETWEEN R4904 AND JW323
CTC187 CO CHANNEL INTERFERENCE R7606
CTC187 NO VIDEO?NARROW LINES ON SCREEN CHECK CR4302
CTC187 NO VIDEO C2920
CTC187 LOW AUDIO EEPROM BAD. LIFTING PIN 3 OF U1901 RESTORES. DON'T CUT
TRACE.
CTC187 UNABLE TO RESET U3101
CTC187 PIX BRIGHT W/RETRACE, G1=130V S/B 16.3V C5002 LEAKY
CTC187 AM RADIOS RECEIVE INTERFERENCE FROM TV C4001 CAP ACROSS AC LINE BAD
CTC187 VIDEO HAS BARS R4501 820 OHM ACROSS VERTICAL YOKE OPEN
CTC187 TV AUDIO DROPS OUT WHILE IN SAP MODE REMOVE C1609, REPL W/47UF/25V
ADD 100K IN PARALLEL W/CAP
CTC187 TUNER INOP. XTAL AT U7401 ONLY 15KHZ Y7401
CTC187 TUNER INOP UNTIL WARM CR4104 LEAKY
CTC187 PIX RED W/RETRACE, RED CATHODE=188V S/B 200V Q5001 LEAKY
CTC187 NO PINCUSHION CONTROL BAD TRACE AT E803
CTC187 PIP INOP DISPLAYS PIP, NO SIGNAL AT U2901-19 Q2904
CTC187 DEAD. U4101 REPEAT FAILURE T4101 (TESTS OK)
CTC187 DEAD. NO HORIZ DRIVE T4301, SOLDER BAD AT R4134
CTC187 DEAD. H.O.T. -C=0V HAS DRIVE TO BASE SOLDER BAD AT T4401-1, -2, &-3.
CTC187 BRIGHTNESS ERRATIC R5029 OPEN. C5002 SHORTED
CTC187 NO TUNING IF NO 33V SOURCE AT PIN 4 OF U7501, TRY REPLACING CR4108.
CTC187 POWER UP INOP SOLDER BAD AT Q4302-C
CTC187BG PINCUSHION DISTORTION R4858 270K OPEN IN PIN CIRCUIT
CTC187BJ NARROW ON SIDES, WIDTH AND HEIGHT VARY WITH SCENE CHANGE REPLACE
C4407 AND CR4403 (WILL TEST GOOD)
CTC187BJ TOO WIDE?BAD PIN REPLACE CR4403P
CTC187CK EXCESS BRIGHTNESS WITH RETRACE/ADJUST DOWN WITH SCREEN CONTROL
LEAKING C5002 ON CRT NECK BOARD 12K OHM
Perry Bower, (EHEER) Electronic Home Entertainment Equipment Repairer
Electric Medic
"It's Cheaper to Keep Her"
http://www.electricmedic.com
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-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Bill Dravenstott
Sent: Sunday, June 01, 2003 7:34 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] 2nd Post repeat failure STK 730-30 in RCA CTC
187CL3
Hi All,
This RCA 35" F35673MB, CTC 187CL3 was repaired 2 months ago with STK 730-30
bad and CR 4106 shorted. Replaced with OEM parts from RCA.
Unit is back and intermittently will kill the STK 730-30 again while in
standby mode. Have been able to get no handle on cause. In standby the
voltage out goes to 207 volts and pin 1-2 go to 0 and it dies. May turn on
and run normally 9 or 10 times in a row then it won't start just squeels and
dies. The earlier post lists a parts list we have tried. Maybe just bad
regulators?? Trying another source. Anyone else seen this before?
Suggestions?
Bill Dravenstott
Elza's HOme Store, LTD
Ashland, OH
cdravens@xxxxxxxxxx
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