TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2145R	White h band on the screen, r520 increased in value	After ten minutes of operation, this receiver displayed aone-half inch white horizontal band at the top of the screen. verticalsize and linearity were not affected.
SONY	KV2142R	Snowy picture, replace d2214, q2224, q2220 & uhf tuner	Snowy picture on all channels except ch. 2. the reason youwould get a clear picture on ch. 2 is due to the low voltage used onch. 2 coming through the uhf tuner.
SONY	KV1952R	Picture distortion, c544 open	Set came in with narrow picture, pincushion distortion andvideo smearing. the 200 volt line measured about 140 volts.
SONY	KV1948R	Vertical roll on weak signal ch., resoldered r581	Vertical roll on weak signal level. no problem on strongvideo signal.
SONY	KV1547R	Vhf channel fade out	After 30 min. to 1 hour of operation, low vhf channels fadeout.
SONY	KP5040	Intermittent mechanical operation, poor ground connection	Intermittent door opening. s953 on the motor: one side ofswitch was not tight due to no threads.
SONY	KP5020	Poor focus after warm-up	After warm-up, picture would go out of focus. found redpicture tube focus shorting inside tube. this caused blue and green togo out of focus, since all three tubes (focus) are connected to the sameblock.
SONY	KX2501A	Beat pattern in the picture, re-routed cables p2 and p3	There was a beat pattern in the form of a 1 inch vertical lineabout 2 inches in from left side, on ch. 7 only. moving the ac cordwhere it was connected to the d board would increase or decrease theproblem.
SONY	KV5200	Raster with retrace lines	Set came in with all white raster with retrace lines. audiowas ok.
SONY	KV2654R	Picture up/down button stuck, replace s004/005/006	Picture up button was stuck. therefore volume up/down andpicture up/down or channel up/down would not work. found picture upbutton was worn. this switch was spring loaded in rather than out.
SONY	KV2649R	Dark picture, open r541 and shorted c531	Dark picture, slight retrace lines. no screen voltage tocrt g2.
SONY	KV2647R	No color, replace ic-501	Picture was dark and also had loss of color. scoping ic501pin 15, horizontal sync pulse was only 6 vpp - should be 11vpp. i haveseen other sets that displayed intermittent dark picture or change of hueonly. all are related to ic501 sync output. the s
SONY	KV2647R	Vertical bars on the screen	This unit had several vertical bars on the left side.
SONY	KV2647R	Mechanical damage, q601 lead	Leads of q601 are breaking due to mechanical stress. duringmanufacture, the leads are being stretched tightly before soldering.as the heat sink flexes during shipping, the leads break.
SONY	KV2643R	H flagging on the top of the screen, replaced ic501	This unit had slight horiz. flagging at the top of the picturewhen using the still/slow features on an sl-2700. all other modes (offair, cable) worked fine as did other betamax and vhs power supplys. the onlyproblem was with the still/slow features on the sl
SONY	KV1952RS	Dark picture and retrace lines, shorted c548 and open r555	Dark pix-retrace lines very faint. no screen voltage tog-2 of crt.
SONY	KV1945RS	Sound distortion, replaced leaky c116	Intermittent, uncontrollable sound. remote inoperative.indicator light on at all times. all manual functions worked fine exceptpix and sound.
SONY	KV1930R	Picture distortion, replaced ne701 on "c" board	When the brightness and contrast controls are turned up(max. beam current), the picture intermittently flashes and produceslarge horiz. dark lines. we found ne701 on the crt board to be the cause.
SONY	KV1913	Dead	This unit initially was found to have a shorted regulator,regulator driver and power module. after replacement we found the b+ tobe low, about 105v. we found neon nl601 in the power supply to be thecause.
SONY	KV1713	Snowy picture	In the last 2 months the tuner was replaced three times,found c217 cap leaky. pix would go to snow.