TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2145R	No picture, resolder c534	Set would blow the horiz. output, at low voltage. i noticedh. frequency doubled. found c534 not grounded.
SONY	KV1948R	Picture distortion (slight tear), normal	A slight horiz. band/pull under conditions of varying beamcurrent. scene changes or large areas of light next to dark. this bend/pull is very slight and i have observed the same symptom on otherkv-1948r models. we have given careful attention to the b
SONY	KV1947R	Poor remote operation, replaced ic101	Intermittent (2-3 weeks) operation in remote and push-buttonfailure.
SONY	KV1947R	No vhf, replace ic002	Set had uhf operation but no vhf operation. no vc was presenton tuner. all switching voltages were correct and verified against akv-1948r. applying external dc to vc line tuned all stations.
SONY	KX1901	Lighter raster on the top	These units had a light area across the top of the screen.the first 12 to 15 scan lines after vertical blanking were lighter thanthe remainder of the raster. it looks like the units had a poor blacklevel just after vert. blanking. also these units have
SONY	KV1222R	Incorrect mechanical operation	The door assy will not stay closed due to the fact that thedoor retainer which is a plastic material, will not engage the catch onthe door securely in order to keep the door closed. this condition isprevalent on at least a dozen sets or more at the acco
SONY	KV1221R	Shut down, replaced r001	After warm-up (or after simply plugging in and not turningon for 1/2 hour or so), the unit could not be powered up. if unit ison, it will then not turn off. remote or manual same. ic001 was bad andthe relay drive transistor as originally suspected.
SONY	KV1215	Dead, replaced l309	While i was servicing the unit using an external dc powersupply, i noticed the absence of audio. inspection revealed no 18vbeing supplied to the sc board. resistance of 18v line to groundmeasured about 1kΩ, should be about 180Ω. i then found l
SONY	KV1207	Dead	12v line was being grounded by r221 lead touching ground.
SONY	VTX1000R	Incorrect tuning operation	The customer complaint was the memory worked fine with theexception that it would not remember more than one channel beginning withthe number 3. it would remember any channel beginning with 3 but notmore than one.
SONY	KX1901	Noise lines on the screen	There were several lines in the raster, about 2 inches down from the top, looked like retrace lines. these were present only whenthe set was cold after warm up the lines would disappear.
SONY	KV2649R	Fm station received when operating in uhf mode, ic002	Fm music is received when a uhf station is selected. vl pinat tuner remains at +11 volts regardless of station selected.
SONY	KV2647R	Snowy picture vhf, replaced vhf tuner	When switching to any low band vhf channel, the picturewould become snowy. readjusting rf agc control would eliminate theproblem. then, changing channels again, the pix would be snowy again.this cycle could be repeated over and over again.
SONY	KV2647R	Picture distortion, replace c-508	The symptom is that the raster will erratically demonstrateshort vertical sweep. it is very difficult to isolate the problem to anyparticular component due to symptom being intermittent.
SONY	KV2645RS	Jail bars, replaced c539	Jailbars faint under normal viewing conditions. problembecomes obvious when camera fades to gray, or picture and brightnesscontrols are placed at minimum. jailbars are then observed in graduallylightening shades of gray from left to right across the cr
SONY	KV2645RS	No last channel memory, replaced leaky d-26 on md board	Last station memory is lost when the set is turned off.
SONY	KV2645RS	Noise lines on the screen, replaced yoke	Lines visible at left side of screen, one inch wide andvertical. all channels exhibited the lines.
SONY	KV1945RS	Dead, wire short to ground	Dead. talking to customer, we found that it was intermittent.finally the set failed to operate and it acted like high voltage shutdown problems becuase you could hear the high voltage come up and then godown. the key point here is that there were no ch
SONY	KV1945RS	No picture, replaced q004	This unit intermittently loses vc voltage. we found q004 thermally intermittent.
SONY	KV1945R	Parts compatibility, damper diode	The parts list show d510, d509 as being a gh3f (damper diode).this diode will only last a minute or two, before shorting. the originaldiode we removed does not resemble a gh3f. i feel there is an error withthe parts list. we can put in a regular recti