TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1945RS	Audio hum, replaced ic102	Hum in sound, follows volume up/down. scoped output ofic102, looks like 60hz hum.
SONY	KV1515	Incorrect tuning operation	Could tune channels 2 to 9 only. vc on this unit cannot gobeyond 15v and band selector switch have no effect, station is tunedregardless of switch position. this problem was caused by a leakys075 causing a high (3.2v) on q104.
SONY	KV1515	Picture distortion	Intermittent vertical collapse, found c508 leaky.
SONY	KV1515	No low vhf	This unit could tune only h. vhf and uhf band. found q103collector to emitter leaky.
SONY	KV1515	Incorrect tuning operation	Unable to tune position #1 to the correct channel on any ofthe 3 band selections. all other positions function normally. foundthat moving band switch at position 13 while in position 1 viewing modewould cause deteriorating effect on position 1 tuning,
SONY	KV1515	No low vhf	Set would not tune above channel 2, traced to leaky vc drivertransistor.
SONY	KV1217	Vertical foldover, replaced c524	Vertical foldover with blanking spot on right upper corner andjittery picture. found c524 installed backwards during manufacturing.
SONY	KV1217	No uhf, replaced tuner	No uhf.
SONY	KV1214	Picture interference	Interference in shape of two vertical lines on left side ofscreen. waveform at input to blanker stage was distorted.
SONY	KV4000	Tuning would not lock	Will not lock on station when cold, after unit warms up willwork properly. found waveform at pin 8 of ic134 incorrect.
SONY	KV3000R	No remote functions	Upon inspection after delivery to dealer it was noted thatthere were no remote functions and only limited manual functions. powercame on immediately after engaging master power switch and set could notbe turned off except with same. the only other manu
SONY	KV2643R	Retrace lines, replaced r749	Excessive brightness/retrace lines. rv2203, rv304, rv701 haveno effect, pin 12 crt = 850v.
SONY	KV2145R	Dark picture, resolder r054	Raster goes dark with sound bars, sound normal, then normalpicture jumps back. found r054 mounted on the print side, cold soldered.
SONY	KV2145R	H tearing & flashing, resolder anode lead	R067 on mf board overheats. noticed intermittent horizontaltearing and flashing across screen. found anode lead which is a plug intype, was not making firm contact.
SONY	KV1946R	Shut down, l503 broken off	Set would go into shut-down mode immediately at turn on.i verified horizontal oscillator and b+ circuits were operating properly.i then noticed that the coil l503 was broken off of the connection onpc board.
SONY	KV1923	Tuning shifts	Channels would program correctly. if set was on channel 2and moved to channel 8 then back to channel 2, channel 2 would not comein. same with channel 8 when set was returned to this channel. thiswould also happen if the set was turned off and back on.
SONY	KV2647R	Shut down with jig, ground hvr	This particular unit shut off instantaneously when power wasturned on. it happens only when chassis was attached to the jig. most ofthe time technicians spent useless hours to find out that the ground onthe hvr was missing (usually a screw grounds the
SONY	KV2645RS	Pin cushion, add resistor in series with r809	Pincushion correction at top and bottom near the corners isalmost null. -hq comments: to correct the problem place a 15Ω 1w resistor inseries with r809 (100Ω 1w) and readjust pin phase and pin ampcontrols.
SONY	KV2643R	No channel lock, replaced c206	Except on low band this unit keeps on scanning stations.ch. 2, 4, 5 could be tuned in but slightly have weak video (slight snow).found c206 leaky causing a drop, at pins 26 and 28 to 1.7 volts insteadof 4.6 volts.
SONY	KV1546R	Vert roll, intermittent vert collapse, replaced c508	Set operates fine for 1/2 to one hour then starts to roll,then vertical collapse. found c508 improperly installed (reversepolarity).