TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV25XBR	Lock-up	Set will not come on or may come on but no other functionworks. checked the reset pulse at pin 3 of ic103 and found it low alltimes. unsoldered pin 3 and voltage went up to 5v. resoldered pin 3 andset began to work. pin 3 now goes to low momentarily
SONY	TTV8U	Beats on picture	Beat on picture like adjacent channel interference.
SONY	BMC550	Skips on pause	Glitch on picture.
SONY	SLHF600	Drum assy	We ordered the drum assembly of the above unit, kc sent usthe right number but the plug was different.
SONY	SLHF400	Loss of capstan lock when hot	When unit is hot after approx 2 hours, record and playbackhas loss of capstan lock glues, an indication of tracking problem.picture may lock on playback with tracking control to one end of range.
SONY	SLHF300	Loss of tracking in playback	Servicer complained that unit would loose tracking in playback and tracking control had no effect on pix. record mode was ok.slight leakage was detected on q5, causing base of q507 to go high andturn on, putting composite sync on pin 3 of ic501.
SONY	SLHF300	Tape crinkles at start	At start of tape, lower edge of tape crinkles for a fewseconds. this is not consistent and happens to various brands of tape(mostly l-750) so tape does not seem to be the fault. -hq comments: please try the japanese t/n that i faxed to you(bet-855043,
SONY	SL2415	Intermittent tape jam on eject	This unit displayed poor rewind torque in the eject mode.this resulted in the tape intermittently not being rewound into the shellall the way. tape jam then occurred. normal rewind, fast forward andplay torques were adequate. replacement with the impr
SONY	KV9000V	Intermittent vert hold	This unit would very intermittently loose vertical hold. whenin the failure mode the 100 volt line was seen to contain excessiveripple. this was caused by a thermal q601/series regulator. althoughthis is an old model, we felt it worthwhile to report d
SONY	KV25DXR	Intermittent sync in home management helper mode	This unit worked fine in all functions except the homemanagement helper mode. in this mode the picture would intermittently goout of horiz. sync.
SONY	SLHFR30	Eject button broken	Complete panel needs replacement, and is rejected underwarranty, when only one button is inoperative. panel does not appear tohave any customer abuse or misuse. -hq comments: the eject button failed as a result of a weak or voidarea in the plastic. i
SONY	CCDV8	Bad solder connection of l-sw connector	When you turn on the power sw, drum and capstan motor willkeep turning intermittently. it can be any symptom. it depends on whichsignal from l-sw is missing.
SONY	CDXR7	Wrong indication in svc manual	Pages 58 and 59, #912 is shown as the entire dc-dc converter.the converter is #904 and the cable is #912. -hq comments: we will issue a s/b.
SONY	CCDV8	No pb video, cue/review video normal	No video out in normal play, but in cue and rew ok. firstpoint signal was missing was pin 2 of ic102 on the vi-6 board. the inter-nal doc sw was being activated by wrong input at pin 18. ic101 wasproducing the wrong output at pin 9, but was not itself
SONY	CCDV8	No audio in pb of known good tape	No audio with known good tape. correct audio signal up topin 27 of ic401. noticed that pin 6 was at 0v, presumably indicating amute condition, triggered by do detector. but no dropouts were noticeablein fm signal at tp401.
SONY	CCDV8	No video, just chroma from camera only	No video, just chroma from camera only.
SONY	XR740	Intermittent muting	When installed in 1985 toyota and 1986 honda and the a/c isturned on, unit will mute no matter what mode it is in. i have suggestedputting in a larger inductor and a cap but it made no differenceaccording to the customer. -hq comments: i have heard fro
SONY	XR66	Power antenna activation	Customer installed xr-66 into 1979 cadillac eldorado. whenthe unit is on and the key is turned off, the power antenna retracts.when the cadillac is restarted the radio comes on but the power antennawill not go up. if he hits the horn or the power seat,
SONY	STRVX550	Part number for system cable 9 pin	What is part number for system cable 9 pin between str-vx550. -hq comments: the number for 6 pin (not 9 pin) cable is 1-555-054-00.
SONY	D5	Conductance of chip component glue in vco circuit	The vco was not running. problem was traced to conductiveglue beneath c608 of the vco circuit. when i attempted removal of c608 itshattered necessitating replacement.