TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	CFS500	Manual error	Manual error. p. 30 (2) ref. #16 shown #16 pointing to spkgrille should be ref. #14.
SONY	CFS45	Error in service manual	The ipb on page 37 shows the capstan belt as a take-up belt.also t/r s/b 66 gives a new p/n for the belt. -hq comments: we are issuing a s/b and t/n.
SONY	PST22	Low level noise	Turntable, develops a low level static-like noise which isinduced into the audio ckt. the cartridge used also affects the level ofthe noise. an ortofon lm-10 produces about twice the amplitude of asony vl-7. grounding the motor shaft to ckt. ground el
SONY	XR70	Improving ams response	Ams would not operate for tapes with less than 4 to 6 secondsof silence. problem appears most often when rewinding close to thebeginning of the tape.
SONY	TFM7720W	Defective oscillator	No fm. all voltages looked good. all transistor wereconducting. osc. was not working.
SONY	PSX45	Revolution noise	This unit produced a heartbeat sound (one per revolution ofthe platter) which increased in intensity as the tonearm moved toward thecenter. this noise was being magnetically induced in the cartridgewindings. scoping the motor drives revealed spikes on
SONY	ICR4800	No am reception	No am.
SONY	ICF2001	Could not receive am stations	Pins 2, 11, 12 and 13 of ic201 were inconsistently outputtingdata. latch ic205 was not able to switch antennas to receive am stations.
SONY	KP5040	Poor blue resolution, replaced blue crt	This unit had poor blue resolution and some bleeding.
SONY	KP5000	Color distortion	This unit would change the width of the green raster by twoinches when going from min to max brightness. the unit would alsoconverge ok on internal generator and then when it went back to video, theunit would be misconverged but would still check ok on
SONY	KX2501	Dead, replaced q651 and q653	Unit came in with q652 shorted and seven amp fuse blown.found that excessive current drawn beyond 65v ac when variable inputtransformer turned up. this was with b+ unloaded from power circuit.individual measurement of power supply components showed both
SONY	KX2501	Lines across screen top and bottom, normal (support wire)	When viewing monitor with no video there are faint whitevertical lines across the screen. this appears to be horiz. pulsespossibly from the scan derived b+ voltages. customer noticed these whilerecording with camera and became very critical. he insist
SONY	KV8000	Shut down	Set works fine for an hour or so then goes dead. will comeback on and repeat.
SONY	KV2650R	No operation, replaced d021	Unit cannot be turned off except by master switch, no functionon any mode, i.e. power on/off volume up/down, channel up/down, pictureup/down etc. voltage on pin 2 on ic001 was high (4.8v). found d021leaky (500k).
SONY	KV2648R	Snow picture, r557 changed value	The picture exhibited light snow on all channels all thetime the unit was on. after 5 to 10 minute warm up the picture shrankabout 2 inches vertically.
SONY	KV2648R	No tuning operation, replace prescaler	This set would not tune in any channel when the tune-upbutton was pressed. the tune-down button would work fine. all channelwere tuned in.
SONY	KV2648R	No picture, replaced q602 and q603	It first appeared as if q602 shorted and that replacementwould solve the problem. however after about one hour it would shortout again. q603 was discovered to have e-b leakage.
SONY	KV2647R	No operation, replace ic-502	Set would not come on, no sound or picture. found ic501loading down vcc on chip to 2vdc, should be 12.5vdc.
SONY	KV2647R	Incorrect tuning, resolder r-085	When unit turned on, it would come on with different channel.
SONY	KV2647R	Faint lines on the screen	Faint lines on left side of picture. these are vertical linesspaced about one inch apart. they vary in thickness from one eighth inchto nothing as they approach the center of the screen. -hq comments: slight ringing (vertical bars) visible on low brig