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A single set of horizontal lines could indicate damage, a graphics system failure, or loose internal video cables. Broken signals from cables or graphics hardware creates impurities in reproducing an image on an LCD screen, conditions that often manifest in the form of vertical or horizontal lines of color.
Sounds like you pulled the TV apart, good luck. Hope you earthed yourself. You could try a replacement t-con board. if that was the problem. http://electronicshelponline.blogspot.com.au/2012/06/how-to-replace-faulty-tcon-board.html
Diana, did you ever find a solution? My Toshiba (same model) is about 2 years old and it started getting these 4 horizontal lines spaced pretty far apart and a double image at bottom. When I lightly tap the top of the TV, they went away. But now that is not working. Please let me know. Thanks. Jeff
there is no virus. the problem is the screen. you need to replace it with new screen or let if fix by a technician. they will replace the vertical and horizontal transistor. or so.
horizontal circuit problem .. vertical double image or horizontal.. check screen voltage and focus setting on board. CAUTION: EXTREME HIGH VOLTAGE. QUALIFIED SERVICE PERSONELL ONLY .. serioius high voltage..
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