Question about Sony KP-48V80 48" Rear Projection Television

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Sony tv model no. KV - 19 APR 2

Pls. help me fix this sony tv. only reddish horizontal line appear on the screen. pls tell me what to check or repaced, the vertical IC is UPC1488H. i already replaced all electrolytic capacitor around the vertical IC but still i doesnt work.

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This is for a different model, but I had thin horizontal lines in red and had to adjust the tube for red. You may have a similar adjustment on your set.

http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html

Posted on Aug 14, 2008

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The probable defective part is the vertical IC. If changing that does not resolve the problem, check the capacitors in the same circuit. Also, check for the proper voltages at the vertical IC. If the IC is not being fed its power, it won't work either. I don't have a listing for your specific model. If you can post the vertical IC part number (LA7837 for example), I can list the voltages per pin.
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1 Answer

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Aside from the parts you mentioned check the vertical connection to the yoke (usually yellow and green wires), it may have a cracked solder joint or it could be burned. Also check the yoke for a broken vertical winding.
If the line is yellow with no other colors you may also have a bad color gun or drive transistor. If all color guns are working the line should be white.

Mar 14, 2008 | Televison & Video

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