TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	TCM7	On servicing	No way with unit opened up to apply power to any mode andobserve voltages gears operation or functions. we need some kind of jigso that audio board can be remote from mechanism and still be operated.this also applies to model wm-7 as well. -hq comments
SONY	TCPB10	Shorted d301	One servicer found no power in several unit. all of them hada defective bridge diode (d301). one of the rectifiers connected to thenegative side of the bridge was shorted.
SONY	STRVX550	Defective ic301	Memory would not hold functions. battery and power supplygood.
SONY	STRVX550	Tuner not always function	Output would switch on and off. tuner would not alwaysfunction. display intermittent.
SONY	STRV25	Defective relay	When the unit is cold, the speaker protection relay (ry601)clicks, but no audio comes out. opened the case of the relay and foundthe flux from pc board which was preventing the contact of the switchinside the relay.
SONY	STR454	Open r447	Preset memory would not take stations, no last stationrecalls.
SONY	SPP11	Error in manual	The part reference is indicated on the printed circuit boardsare wrong. in the base unit, rv9 is marked r59. in the handset, c34 ismarked c37. this is one of the caps to be replaced during channel changemodification.
SONY	PCM701ES	Leaky d201	Volume control appeared to be defective. it was noisy whenvaried. input to q201 always had a negative voltage present. this wascaused by a leaky d-201.
SONY	ICFC10W	Pop in audio	Pops in speaker when radio alarm is activated. seems to becaused when q4 is switched. there is dc differences between switchedgrounds. -hq comments: the mild pop prior to audio is normal and as you suspectedcannot be eliminated. further efforts to el
SONY	ICF9540W	Replacement switch is different	Legs of switch are too short. original is 11 mm. replace-ment is 7 mm. switch needs to stand away from board for proper operation. -hq comments: currently, a new number is being assigned to this am/fmband switch: t-998-029-91
SONY	CDP101	Defective ic507	No analog output from ic507 (d/a converter). all supportsignals present. data input present. no noise detected.
SONY	XR75	Switch contact not good	Intermittent operation of eject. works on first touch fiveout of six tries but then requires several hard pushed on button on geteject.
SONY	XR55	Pc board cracks	Pc board cracks by attempting to disassemble the unit withoutremoving the support bolt on rear of unit which protrudes into the unit.
SONY	XR45	Placement of q315	The belt was rubbing on q315 causing wow in audio and slowrewind. q315 was leaning the wrong way.
SONY	TCM5	Case must be insulated	After installing new motor and board observed intermittent operation of motor and intermittent speed.
SONY	TCFX2	Stuck lever	Audio line output muted in all modes. the problem wascaused by a stuck lever assy, which is used to operate the mutingmicro-switch, located on the lower right corner of the rear of the tapetransport. while attempting to disassemble, the lever suddenly
SONY	TAAX6	Defective relay	The left channel would intermittently cut in and out. wefound the problem to be the speaker relay.
SONY	STRVX4	Defective ic404	We were unable to vary vc voltage to the tuner on this unit.the display worked normally. we found that there was no output from 11 ofthe pll ic404.
SONY	STRV55	Leaky c101	Only white noise was heard in fm mode. pll tuning voltage(2.8-20v) did not change at all.
SONY	RS30	Open r205	Unit would not enter answer mode or playback ogm. ogm wouldbe put on tape with cue signal but not played back. private message wouldplay back normally. cue signal (pin 2 port c) on ic202 was 1.8k squareand unstable causing cpu not to read cue. this