TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	D5A	No disc rotation	Screw was broken and the screw head stopped the disc motor.
SONY	PSX45	Intermittent motor movement	Intermittently motor would go and stop.
SONY	KV1357R	Signal drift on channels 4 and 5 only, solder splash q101	After set was on about 4 to 5 hours, the signal would drifton channels 4 and 5 only, ie, severely mis-tuned. i noticed a soldersplash between gate and power supply leads of q-101. when the short wasremoved, we lost channels 4 and 5 completely. all other sta
SONY	FD40A	Raster distortion when moved within any magnetic field	When unit is moved, distortion occurs in raster, ie, bottom ofthe screen will bend causing distortion in scan lines and the raster willexpand and contract causing a change in size. -hq comments: the symptom you are describing is common to all crts. iti
SONY	KV2670R	Different ic301, see s/b ctv0236 and tvp0025	Ic301 in actual set is not the same as in the service manual.manual and schematic say ic301 is a cx-20129. same units actually use acx-20193. these parts are not interchangeable. p/n for cx-20129 is 8-752-012-91 p/n for cx-20193 is
SONY	CDP302	No display	Machine functioned normally with the exception of having nodisplay. checked filament voltage and inputs and outputs to displaydrive chip and found no problems.
SONY	KV25XBR	Dead	Unit was dead. no functions. traced problem to shortedd1657 (pin damper diode).
SONY	KV25XBR	No sound	No audio output. traced problem to ic1107 on the x board.this is the second report i know of this problem.
SONY	BMC110	Distorted playback picture	Recording played back showed distorted picture only filling1/5 of the left side of screen. a white spot was in the center when theiris was opened up.
SONY	SL5000	Can	Sometimes ejects tape when play is pushed. ant sel in wouldchange logic when button pushed but that the output stayed high. changingmicroprocessor produced no change. pins 30, 31 and 29 all were high.unsoldering these pins allowed the program select t
SONY	STRV55	No tuner or memory	No tuner output or memory functions. tuning voltage to tunerremained at 30v regardless of frequency indication on display.external dc on tuning line resulted in good reception. dc on ic402were wrong for pins 2, 3, 8 and 14, 15. replacing ic401, ic402,
SONY	SL2400	Spurious threading at turn on	Unit would attempt to thread tape immediately at turn on,even without a tape inserted or loaded. problem was intermittent.
SONY	STR313	Hifi bulletin #116	Ic601 si-1125hd original was replaced with si-1225hd and unithad distorted right ch. another si-1225hd was installed, same problem.
SONY	SL30	Low audio playback level	By shimming head out 0.012 inch the audio level came up toaround normal levels. i would like to know why the head angle is sotouchy on these two head samples.
SONY	TCYX50	No part # for capstan motor	No part number for capstan motor in service manual. -hq comments: the part number is 8-835-049-01. the part is availablefrom npc.
SONY	TCK65	Missing part number for chassis ass'y mechanism	Need part number for chassis ass'y mechanism. -hq comments: the number is x-3564-020-0. it is available from npc.
SONY	FD40A	Keystone picture, replaced q601	Keystone raster. found no 17 volts being generated.
SONY	KV1961	Intermittent audio, replaced neon lamp	On position number 6, audio would come and go. found neonlamp causing triggering of the muting circuit.
SONY	MDRFM5	Part number for s401	We need part # for s401 auto off switch. -hq comments: the part # is 1-553-589-00. the s/m for the us version ismissing some parts. this has been supplemented with the radio s/b #172.parts are also listed in the s/m for us/e/aep version.
SONY	SL2700	Dead	Push power switch on, power switch light does not light, drumis turning, tv/vcr switch does not work, and will not take a cassette.