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Re: horizontal lines on lcd screen
-Try connecting the display to another computer, if the follows the display chances are good its a problem cable inside or more likely the LCD panel itself going bad.
If the problem stays with the computer:
-Try reseating your video card.
-Unplug, inspect and reattach your video cable. Check both ends if possible and pay special attention to any bent pins.
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unfortunatly, horizontal lines on an lcd tv, almost always mean a bad lcd panel. if it is out of warranty, it will be really cost prohibitive to replace the panel. if the set is only a year old or so call sony customer support and ask for a concession for the part.
On the KDFE55A20 this sounds like a bad Q-Box. I would get an estimate from a Sony authorized servicer as this part may be quite expensive. On the 55A10 model this may be the B-Block and is also quite expensive. Getting an on-sit estimate would be the first step I suggest. Again go with an authorized Sony servicer. Call Sony or go to Sony.com for customer service. Good Luck