TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1354R	No programming, replaced q-024	Unit would not hold memory. when you set tunning switch on vcwould go to max. and green tuning bar was all the way across. checkingaround memory chip ic-002/pin 2 had no -25v. found q024 open.also found that q-024 on some sets replaced with a 680Ω
SONY	KV2670R	Intermittent audio, speaker lead cold solder	Two units with intermittent audio caused by unsolderedspeaker leads.
SONY	SL2400	Power supply	Unit will not cut off with power switch or remote. this unithas a ps-34 and ps-35 circuit board (power supply). it is not ul listed.how do we get the correct service manual? -hq comments: a supplement-2 was issued in jan 1984 which covers theps-34 and
SONY	KV25XBR	Rgb goes on by itself	Rgb will turn on at sound vibration or by opening/closing ofcontrol panel. the unit sensitive to vibration has its rgb buttontouching the switch and just slight vibration will turn it down.
SONY	PST20	P/n for headshell	We need a p/n for the headshell of ps-t20. page 22 of themanual shows it but only gives p/n for cartridge. -hq comments: the p/n for the headshell is x-4857-616-0. it is listedon page 38 in the service manual (for us and other destinations).
SONY	SLHF300	No operation	Betamax would load cassette and tape. play button was pushed,nothing happened. tape could be unloaded.
SONY	FH7	Cable connector	Need a p/n for a connector on page 23. itunit (equalizer). the one on the left side of the pictorial is the onewith no p/n in the manual. the connector is a 5 pin. -hq comments: part numbers for the cord with connectors are:1-556-475-00 13p one end m
SONY	KV1770R	Flyback arcing	The flyback burned a hole through the side and shorted outthe horiz. output transistor.
SONY	KV1770R	H.v. shut down	The unit would go into hv shutdown at approx. 100v appliedac. found r559/hold down to be cold soldered.
SONY	STRVX550	Ic301 shut down	The oscillator on ic301 was not running. we found pin 34 tobe low. this was caused by ic401/p19 staying high. ic401/remote decoderwas defective. -hq comments: actual power on is equivalent to conventional units whenyou press system power. then the s
SONY	STRVX550	Dead - no display	No display. no clock signal at pins 31 or 32 of ic301. hold(pin 34) of ic301 at 2.5v.
SONY	STRVX350	No memory	Unit would not retain memory when powered off. hold line was7v instead of 4.9v at ic301 pin 34. found q803 leaky.
SONY	KV25XBR	No display	Two problems: 1) volume changes activate rgb mode. found rgbbutton jammed closed. 2) no channel/function display. found l101 on thea board to be open. there is 5v active low info. present at ic104/p12.
SONY	KV2680R	No sound/pix, cold solder on 12v rectifier d-506	This unit had no sound or picture.
SONY	CFS88S	Audio from tape is distorted/low pitch	The motor was running about 25% too slow.
SONY	KV2675R	Horiz output transistor runs hot, replaced t-501	The horiz. output transistor ran hot on this unit.
SONY	KV2680R	No audio, replace ic1107 and add capacitors/diode	The customer informed me that just before the sound went bad,they heard a loud snapping noise. i feel when the set is new and thetube snaps during its breaks in period, causes the ic1107 to become defec-tive. -hq comments: to protect ic1107 from static
SONY	KV2141R	Horizontal frequency of - high pitched squeal, solder l801	Horizontal frequency off produces high pitched squeal.
SONY	D5	Sled moving to outer edge upon power up	On power up sled moves to outer edge of disc. pin 68 tc201 isproper level. the only unusual signal is ic501 #23 which goes negative(5v). changed chips (ic801, ic501) no change. -hq comments: (found over the phone that disc did not rotate while sledmo
SONY	TC44	Part number needed	Need part number of gear (c) for tc-44. i have informed theservicer that the part may no longer be available. -hq comments: fortunately, the part is in stock at npc. part number is3-550-026-00.