TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2645R	Snow picture, replaced bt981 prescaler	Unit goes to snow. substituting tuner didn't cure problem.voltages around front end seems to be at spec. tried prescaler andthat solves the problem.
SONY	KV2645R	Poor remote operation, replaced q1	Remote would operate intermittently and is usable up to6 feet from cabinet. q1 on head amp board noisy - collector voltage onq017 on md board was varying between 4 and 8 volts.
SONY	KV2601	Snow picture, replace c209	Snowy picture on all channels. uncontrollable rf, agc:measuring dc potential at pin 5 of ic201 (cx555) netted approx. 2.5vdcwith no change upon varying rf agc potentiometers. measuring c209 outof circuit yielded approx. 20 microamperes leakage.
SONY	KV1945R	Incorrect tuning operation, replaced zener d008, q006, q008	Unable to tune any vhf/uhf stations.
SONY	KV1945R	Poor remote operation, replaced c4	The range of the remote control was no more than about 8 feet. there was excessive noise seen at output of n board, remote amplifier.
SONY	KV1913	Dead	Came dead with shorted horizontal output and fuse. replaceparts, plug to variac and slowly raised line voltage. current wasexcessive showing short on the circuit, but doesn't show on theΩmeter.found bad flyback.
SONY	KV1545R	No tuning, replaced pre-scaler	No signal on any channel except sound on ch. 13 only. ifexternal voltage was introduced to vc line i could get some of the highband channels, which indicate tuner was good.
SONY	KP7220	Insufficient width, replaced ic-2003 "k" board	Unit suddenly had insufficient width to fill the screen.voltage on 115v regulator on k board was about 10 volts low.
SONY	KP5000	Poor purity	Color purity problems around edge of picture. problem was caused by flaking of phosphor edges on all three crts.
SONY	KV2645R	Incorrect operation, replaced x002	When master power switch turned off and unit allowed to cooldown, it would take approx. 2-3 hours for any function to operate afterapplying power. cooling the ceramic osc. x002 would cause unit to shutdown and all functions became inoperative.
SONY	KV2645R	Picture dark with excessive color, replaced r-751	Color overload or flaming color. color was especially extensive mostly in the red spectrum. even when the color was turned down, some overload still existed.
SONY	KV1945R	No audio, replaced open r232 and shorted q205, q206	Not audio.
SONY	KV1942R	Tuner drifts, replaced zener d2103	Tuner drifts off channels and several lights are lit at thesame time. 18 volt line to tuning circuits would be low, about 10 vdc,and problem would occur. d2103 was zenering at lower voltage causing18v line to drop.
SONY	KV1913	Dark picture	Dark picture.
SONY	KV1913	Sound distortion	After warm-up sound would distort and change in volume.
SONY	KV1714	Set locks on ch 2	Set locked on ch. 2 defective cx804 (ic033) decreasing 35vsupply.
SONY	KV4000	No tuning on vhf low	No automatic nor manual tuning on vhf low, vhf high anduhf band. found no voltages at vc terminal of tuner - resistancemeasurement showed short to ground - tracing back found short at m1 plugon m board - pin 8 shorted to pin 9.
SONY	KV2645R	Snow picture, replaced x001	Intermittently, tv reception would stop except for a verypoor channel 6, snow on all other channels. address line a always high(11.9v) regardless of channel selected.
SONY	KV2643R	Picture shifts, demagnetized crt	Graphics were shifted to the right. when unit was taken toservice shop and center-cross generator placed on set the centering wasoff approx. 2 inches to the right. all associated circuitry was checkedand found to be in proper operating condition. repl
SONY	KV2643R	No picture, replaced c607	The following parts were bad in this set: q901, q902, q601,r605 open, r609 open, r232 open, connector a-10 on pc board arcing.after all these parts were replaced, the set would come on and thepicture would blink severely, both horizontally and verticall