TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1946R	Shut down, replace ic601	Set turns off by itself after 45 minutes.
SONY	KV1946R	Sound and picture distortion, replace q051	Set would not go all the way off. when turned off, pix woulddim, sound goes off. found q051 relay drive transistor completelyburned out.
SONY	KV1945RS	Intermittent sound, replaced ic202	Unit had very intermittent sound.
SONY	KV1945R	Sound pop noise, replaced c226	Sound would pop off and on intermittently.
SONY	KV1922	No low vhf	No low band vhf-uhf ok. vhf high ok. no negative 6 volts atvhf hi terminal of tuner apply external -6 volts could tune in low band.q102 vhf hi drive had no negative voltage at base troubleshooting found-12v rectifier being loaded.
SONY	KV1746R	Intermittent shut down , replaced q901	This set very intermittently shuts down. it could run a weekjust fine.
SONY	KP7220	Picture distortion, replaced d5319	Overscan.
SONY	KP5040	Incorrect mechanical function	When closing mirror assy, motor stops intmtly during first 3or 4 inches of travel. this is more severe if even the slightest pressureis applied in a downward motion on the reflector when motor is running.the plastic pipes tend to jam severely when press
SONY	KP5040	Shut down, replaced high voltage block	Door would not open. unit would shut down.
SONY	KP5000	Out of convergence	Green would go in and out of convergence as the green tube wasarcing. also brightness level change would affect size of green pictureproducing misconvergence effect.
SONY	KX2501	Intermittent black blobs in pix, replaced t1501	Black blobs intermittently come and go and move around thescreen. the intensity and size can be varied by adjusting the videoinput level or ac input. by observing the waveforms in the horiz.circuit we found varying amounts of distortion at the secondar
SONY	KX2501	Volume level changes with pix control, replace ic101	Sound would increase when increasing picture level, decreasewhen lowering picture. adjusting sound control would have similar effecton picture level. mute control would not fully mute sound. pwm signalsfrom up, ic101 pins 2 and 3 were of the same ampl
SONY	KV9400	Intermittent color	This set was intermittently losing color. found horiz. pulsemissing at pin 20 of ic301. traced problem to c311 which was opening up.
SONY	KV9200	Retrace lines	Customer objected to three-four vertical retrace lines onlyvisible while watching two channels 9 and 32. lines appeared to sparkleas if they were being modulated with information. scoping verticalblanking pulse, noticed excessive pulse width. working
SONY	KV2647R	Black lines on the screen, replace ic501	Solid black line across the screen about 1/2 inch thick,2 inches from the top. very intermittent.
SONY	KV2647R	No color, replace ic501	No color. very low burst.
SONY	KV2645RS	No uhf, replaced prescaler bt-981	No uhf, vhf ok. all voltages and pulses present excepttp-59.
SONY	KV1943R	Intermittent sound, replaced c226	Highly intermittent audio. slight popping noise beforegoing out.
SONY	KV1923	Tuning up/down would not lock	In the program mode tuning up/down set will not lock onchannel.
SONY	KV1914	No sound	No sound. voltage at pin 21 of ic201 was low, should havebeen 5.8 vdc, was only 4.0 vdc.