SONY TV Repair: Common Faults and Solutions.

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SONY Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
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.
SONY	STC7000	Adjustment needed	The maximum deflection on tuner input meter did not correspondto center channel on tuning meter. adjustment of fm discriminator and fmif was unsuccessful.
SONY	SQA2030	Defective q701	Noise in back channel outputs. -hq comments: replaced regulator transistor q701, 2sc1124.
SONY	PSX70	Weak motor	Tone arm would not complete return and play cycle wouldstop widway most times.
SONY	PSX40	Defective mgh	Turntable speed erratic. maximum output from mgh was 15-20mvp-p. even slight readjustment of the head caused it to scrape theplatter.
SONY	PSX30	Loose lead on c101	Frequent slowing down of motor. found one lead of c101loose.
SONY	PSX30	Defective detection lever	Scraping noise. cause: detection lever had been jammed underprotrusion on bottom of cam gear in shipping and was permanently warped.this was touching the top of the magnet ass'y on the motor shaft.
SONY	PSX20	Defective ic101	In play mode turntable operates normally, in stop mode (poweron) turntable rotates backwards. in stop mode, ic102-2 output goesnegative 2.1v and inverting input remains slightly positive (pin 6). theoutput of logic pin 6 of ic101 remains at +1 volt. g
SONY	PSX7	Defective q203	Automatic function engages when power is turned on or off, andspeed varies. this only occurs when unit is cold.