TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1913	Channel not lock	After 15 minutes, set would go into random timed sound muteand aft drift in short spurts. trouble would only show itself whileconnected to cable system in customer's home (ch. 3) and would not show inservice shop. it was later discovered that ch. 2 is
SONY	KV1746R	Dead, replaced d007 and r123	Unit would not turn on. found d007 shorted and r123 open.
SONY	KV1746R	Dead, replaced ic1 on the "n" board	Set was dead after a thunder storm. remote did not work.relay did not activate when power button was pushed.
SONY	KV1746R	Incorrect tuning operation	An attempt is made to program a channel button. althoughreception is ok, there was no memory and once another button is selectedall buttons have lost their program.
SONY	KV1741R	Incorrect tuning operation	On this set, complaint was that ch. 5 was hard to tune in andhad a horiz. bar traveling up in pix. inspection revealed that horiz. barwas present on all channels, more noticeable with weak signal. furthertests showed that -11v supply was only -3vdc. d
SONY	KV1715R	Incorrect tuning operation	When turning this unit on it would take 3 to 4 seconds beforeit would select the last channel. then the set displayed a variety ofproblems, the picture had what looked like 60hz ripple in it with lack ofcolor sync. you could select different channels,
SONY	KV1711	No picture	This unit had excessive hum and low b+. it was evident thateither the main filter was bad or the regulator was not working. itbecame obvious that the regulator was not working. careful examinationfound r604 open, although it was not burnt. i have see
SONY	KV1547R	No low vhf	Inspection revealed that vc voltage to tuner would not vary.voltage at pin 22, ic005 was always 4vdc, should be 2.1vdc, with nosignal and set tuned in to vhf low. r074 was not soldered on one end.
SONY	KV1547R	Delay in turn on, short ic001/pins 17 & 18	I noticed that it took 4 seconds for set to come on. also,when first turned on, response light would not illuminate. collector ofq010 always had a dc level on it and a noisy square wave. pulses werealways present at pin 18, ic001. further inspection
SONY	KV1543R	Incorrect tuning operation, open ground d039/r055	When set was turned on, it was locked into address position aand would not tune out of this position. any movement of m2 board wouldclear the problem. i then noticed the junction of d039 and r055 which aregrounded at a common point of the pc board, was
SONY	KV1513	Dead	This unit kills this if ic after 3 days. replacing ic andinstalling a diode on the vcc of ic, figuring spike entering the part,with no luck. when ic was bad, no sound and picture just snow. voltageson agc pins are all wrong, but when new ic was put in
SONY	KV1204	No raster, replaced flyback	No raster or lack of width with flashing lines. after setis on for about 10 to 15 minutes the flyback transformer became hot. part# 1-439-185-00.
SONY	KP5040	Test signal interference, r3383 and r3384 connection change	I have two kp-5040s with cross-hatch interference on weaksignal stations - cures suggested in fprs have not helped. if i liftr3383 and r3384 from the 12 volt line and jump them to pin 2 of connectorba-9, and thereby remove voltage from the horizontal cr
SONY	KX2501	High pitch squeal, replaced t654	When the unit would warm up there was a high pitch squeal.
SONY	KX2501	Intermittent horizontal sync, replaced ic501	After set got warm about 5 minutes, pix would lose horizontalsync. cooling the ic501 would correct problem.
SONY	KX2501	Poor picture, replaced ic103	Customer complained of dim picture and excessive audio level.
SONY	KV9200	Parts information missing	I need assistance with the above unit. it seems that thecircuit was modified or changed during production and this was not shownon the s/m or the two existing supplements. this particular set has adiode d402 and q410, q411 added to the base of q402.
SONY	KV2650R	Set would not get some channels, replace ic001	Set would not get channels 2,3,7,8 on cable. changed ic001.set would then pick up missing channels, but was missing others. ic waschanged again and would pick up all but channel 13. set was delivered tohome and would receive all channels but 3. set r
SONY	KV2648R	Shut down, relay contacts	Set comes on and immediately shuts down with loss of b+.found relay contacts spaced too far apart. therefore there was no wipingaction to the contacts at all. i have also found this problem onnumerous other sets.
SONY	KV2648R	Dead, replace q602 and r616	Set came in dead. found convertor q602 shorted and resistorr616 open.