Is it possibly overheating. Tv's like humans need a rest period. If the Tv is always on, it could be overheating. I know some laptops will auto-shut off because overheating. If it is close to a wall, try moving it away to see if that helps. Also, make sure it is not near any liquid source as this may cause short outs...hope this helps.. best of luck
SOURCE: 52" Sony Bravia TV has a thin Blue line down left
A line on an LCD screen can be cause by the screen itself going bad or the T-con board. The T-con board the attached to the screen on the backside and covered by a heatshield. If you get teh part number from it you can find it online from one of the many retails that might have it. Like www.interliquidparts.com
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