TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCK2A	Defective d306	Unit came into fsc with complaint of no record or playback,erase ok both channels bad. power supply check showed correct b+ voltagesfor amplifier circuits. muting transistors q103, 203 were not turningoff. q303 (muting driver) q103, q203 all ok. foun
SONY	TCK1A	Replacement trans don't work	Q101 and q102 (q201 and q202) are both 2sc900e transistors.these were ordered and 2sc1362 were shipped as subs. they do not worknone of the subs listed work. in the parts list of the manual a 2sc1362(8-729-665-45) is listed. -hq comments: the beta ran
SONY	TCK1A	Incorrect p/n	Listed motor on page 24 of instruction manual shows incorrectpart number.
SONY	TCK1A	Crack in pcb	Several units had no indication of record led in record mode.this is not due to defective record led. the problem is caused by a breakin plating, on the record led circuit board.
SONY	TCK1A	Same p/n for different numbers	The p/n for the record button is the same as rew/ff/play. itshould have a diferent number, as the original has a red mark on thebutton and the play/ff/rew do not. -hq comments: this information can be found in the july 1979 technicaldigest on page 4.
SONY	TAN88	Defective components on power supply board	Complaint was intermittent noise in left channel. speakerrelay would not stay on. found l-ch waveform at tp1 at b-level, r-chwaveform erratic.
SONY	TAN88	Broken pcb traces	R-ch won't work.
SONY	TAN8550	Missing connection	Dc balance circuit in class a amp board does not function.due to missing plating in ground line circuit. this in turn supplies dcvoltage on 0 volt line which in turn causes vfet failure. also i feelthat if the value of rt701 22 kΩ dc bias adjustment
SONY	TAF5A	Thermal fuse in transformer	Primary of t503 was found defective. upon removal andinspection, a thermal fuse was found in series with pin 1. there was nosign of heat anywhere in the pps. jumping the fuse restored operation -a new transformer was ordered.
SONY	TAF5A	Defective d363	Unit came into fsc with burned r360 and leaky q352. staticcheck of other components showed no gross shorts or opens.
SONY	TAF3A	Transistors shorting to heat sink	After the output transistors have been replaced, and unit hasplayed, the outputs will go out again.
SONY	TA4650	Dc balance	Dc balance on the speaker outputs is determined by matchingof q302 and q303.
SONY	TA2650	Replacement transistors are improved	Customer complained of noise with volume control at midposition, standard input levels.
SONY	TA2650	Switch out of proper location	No audio output on any function - function switch (s1) wafers180 degrees out.
SONY	STRV55	Lead dressing needed	Whining noise from processor with no fm signal and muting off.
SONY	STRV55	Wire numbers are reversed	Incorrect wire number. numbers #1 and #3 reversed.
SONY	STRV35	Defective outputs	The npn output transistor opened on one channel of each of these receivers. no other problems found.
SONY	STRV2	P/n for glass	Cases of concealed damage to front glass on these models havebeen reported. present solution is to replace entire front panel assemblybut it is costly. -hq comments: a similar situation developed on the str-4800sd, -5800sd,-6800sd models 3 years ago.
SONY	STR7065	Protection transistors reversed	Burned main amplifier board was replaced (x-482-232-50).amplifier clipped at 1 watt out.
SONY	STR212	Defective ic20, 301, q301, 302	No am or fm - ic201 voltages incorrect, q301 collector read 11volts. replacement of individual ic, would knock the other chip out.