TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2648R	H stripe on the screen, replace ic501	This unit had a 1/2 inch wide horizontal stripe across thetube that was slightly darker than the remainder of the crt. the signalat ic501 was down to about 1vpp at pin 9. the dark stripe was causedby the spreading of the raster lines in this area. the
SONY	KV2648R	No hue conrol with remote, replaced ic4002	No hue control in remote operation. pins 9 and 11 only go1.3v high. also both go high at the same time.
SONY	KV2647R	Picture distortion, replaced yoke	Raster was distorted at top of picture. customer complainedproblem most noticeable when any vertical line (or lines) appears onscreen. straight lines were bent in towards center of crt. looked likepincushion correction problem. any physical movement
SONY	KV2645R	Audio pop noise, replaced t207	When changing channels, a pop occurred at the speakers.sound was normal otherwise. troubleshooting revealed a signal distortionat ic202 pin 5 that is synchronized with the muting input at pin 4.
SONY	KV1947R	Incorrect tuning operation, replaced ic001	Pressing channel up or down button on remote or on the manualfunctions would give no response. direct access tuning worked.
SONY	KV1945RS	No last channel memory, parts touching	Unit came into servicer with complaint of intermittent nolast channel memory, volume level and brightness level. servicer checkedall voltages. they were ok. he replaced ic001 thru ic006 but unit stillhad the problem.
SONY	KV1722	Q510 failure, replaced damper d517	Intermittent failure of gcs (q510). the technician complainedthat all voltages waveforms etc. were in order. yet this set would veryintermittently blow the horiz. output q510. careful examination revealedthe solder land on d517 (damper) to be loose.
SONY	KV1710	Dead	Problem of replacement fbt first reported out of houston fscand later from servicers. fbt p/n 8-983-126-15 subs to 1-439-120-00replacement flyback has added resistors for protection and pin #3 isgrounded at terminal. pin #3 is 18v supply and should not
SONY	KV1545RS	Incorrect remote operation,replaced ic101	Pressing on/off or picture up buttons on remote transmitterwould not affect receiver.
SONY	KPR4600	Shut down, replaced blue crt	Immediate shut down at turn on. could hear arcing from unit.with back removed could see blue crt arcing.
SONY	KP7225	Poor convergence	Poor convergence with some controls such as tilt and key stonenear limit of their range.
SONY	KP5040	Poor focus, adjusted electrical and mech. focus	Distributors complain of poor focus on kp-5040. a littleblurry was traced to the acrylic lenses, which are transmitting a slighthalo around well defined objects. noticeable around the blue cross hatchbars, which causes them to appear wider than the oth
SONY	KP5040	Wrong part number, r818	Resistor r818 on e board is shown as a 3.6Ω resistor onservice manual schematics. it should be 3.6 kΩ. parts list in rear ofmanual is correct.
SONY	VTX1000R	No picture	Dead tuner 6.8v line is 0v. found ross at the 6.8v regulatoropen.
SONY	TV123	Intermittent picture distortion	This unit very intermittently pulled from the sides and/ordisappeared. no loss of horiz. sync. occurred.
SONY	KV8100	On/off switch would not work	Cust. is using kv8100 with a vhs machine on a boat. both tvand vhs are on 12vdc. the kv8100 will not shut off with on/off switch. -hq comments: we can try to go around that by insertive rc separator(10 kΩ in parallel with 0.01u) into the cable conne
SONY	KV5020	Narrow picture	Narrow pix - all three crt's were narrow pix remained ingood convergence. looked like the low voltage power supply was weak.
SONY	KV2602	Picture distortion, replaced c508	At turn on full vertical sweep then gradual loss from top andbottom until after 5 minutes picture would be approx. half size.
SONY	KV2601	No color, replaced 3.58mhz crystal	No color.
SONY	KV2141R	Set locks on ch2, shorted q2201	Display says channel 2, no matter which channel selected,tuning ok.