TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1948R	Brightness change, cable signal problem	Going to or going from ch. 13, the brightness will change.
SONY	KV1947R	Snowy picture, replace pll ic005	Unit does not tune - only snow. no pulse output from pllchip ic005 into active filter.
SONY	KV1947R	Intermittent color, l342	This set had intermittent color from date of purchase.tapping on a board would cause color to come and go. following colorsignal path with scope revealed the loss of color at output of l342.in checking this coil withΩmeter, i verified that in fact, t
SONY	KV1946R	No vertical deflection, replace c526	No vertical sweep. there was no sign of a sync pulse atpin 19, ic501. dc voltage was ok at this point. sync pulse was presentat pin 21, ic501. found c526 to be leaky.
SONY	KV1946R	Poor vertical deflection, replace c524	This unit had only about 2 inches of vertical deflection. wefound the voltage at pin 13/ic501 to be very low (0.8v). output from thedriver was also low. we found c524 to be leaky. this is an importantpart of the vertical sawtooth generator.
SONY	KV1945RS	No picture, replaced ic006	Unit fails to tune or show any numeric display on fluorescenttube - just snow on screen. servicer replaced microprocessor. lines forreset constantly high, ic006 bad - actually labelled ic004 on that model.
SONY	KV1941R	High freq. noise in audio and video, replaced ic2101	This unit had a high frequency noise in both the audio andvideo. the tuner was locked up and all the neons were lit. we trackedthe problem to a defective decoder ic in the remote. this was a veryunusual problem as the noise was present everywhere and
SONY	KV1743R	Shut down	This unit immediately went into hv shutdown. at first theproblem appeared to be a power supply/shutdown type of problem. howeverby holding pin 12/ic501 low with a power supply and running the ac up ona variac, it became apparent that the shutdown was b
SONY	KV1545RS	Intermittent jitter in picture, replaced r235	This set had a history of intermittent pulling in the pictureand also vertical jitter. inspection of waveform at output of videodetector was fine. the waveform at base of video amplifier (q202) wasexactly like the waveform at its emitter, i.e. no ampli
SONY	KV1545RS	No tuning function, jumper jw1 not connected	No tuning. no fluorescent display of channel, tuner appearsdead.
SONY	KV1223R	Snowy picture, replaced ic005	No output was present from pin 20/ic005 (pwm out for vc).we further discerned that the prescaler was also malfunctioning.
SONY	KP5040	Picture distortion, shield wire connection changed	Vertical instability on channel 4 only. also loss of verticalsync, deflection and excessive noise only on channel 4. this symptom hasonly appeared in southern connecticut.
SONY	KV3000	Intermittent mechanical incorrect operation	Dealer informed me the doors on kv-3000 would sometimes notclose, this was very intermittent. changed resistor r606 from 180k to120k. dealer will inform me if the problem happens again (resistor onmg-2 board).
SONY	KV2654R	No tuning operation, shorted cp004	Would lock up on one channel also unable to tune stationproperly. found one of the 220pf capacitors in cp004 shorted placing 24volts on the line of the vc as well as the channel select line. there areno p/n's in the manual for cp001/002/003/004 on the
SONY	KV2648R	Beat pattern in the picture, replace vhf tuner	Beat pattern on all channels. disconnected vc and applied dcvoltage. found it only took 0.01 volts to go from a fair picture to onewith beat pattern.
SONY	KV2648R	No screen display, open q4049 and shorted d4046	Bar pattern would not operate on any function. found 9vdcmissing on output of 9vdc regulator. found transistor, q4049 opened andd4046 shorted.
SONY	KV2647RX	Too much red intensity, adj acc rv303	Excessive color intensity - too much red.
SONY	KV1946R	Overheat, leaky d012 causing r123 open	R123 overheats and eventually open.
SONY	KV1946R	Shut down, replaced ic032	Set would turn off when channel 3 was selected. found signaldistorted out of microprocessor when 3 was pressed.
SONY	KV1943R	No lock channel and volume, open c001 on m2 board	Set would change channels on its own. also sound would go upon its own. found c001 on m2 board opened.