In most of the case, the problem is the main board, you may try the below procedure to fix the problem:
Re-Flow Soldering Procedure for Main Board
1.Pre-heat your kitchen oven to 385 degree (No more than 400 degree);
2.Put the main board on a card board (like a pizza box board) in the oven;
3.Heat it for 10 minutes (No more than 10 minutes);
4.Turn the oven off & leave the door open, at this moment, do not touch or move the board until it colds down to the room temperature.
5.Install the board in the TV & try it out.
SOURCE: T.V. turns off unexpectedly
there may be some problem in the power device section on the main board.......the power ic`s will not be functioning well due to heating
SOURCE: Random Turn-Off on KV-34HS420
Hello there,
7 times blinks shows that Horizontal Deflection Circuit doesn't work properly.
I think, its not big fault and can be resolve in low cost at nearest Sony repair shop.
SOURCE: Samsung LN32A330 turns itself off after 5-10 minutes of being on.
its usually the 2200 microfarad cap on the power board that stops working. its really easy to replace and its only a 5 dollar repair part. use a 2200 mF cap rated around 25 volts instead of the usual 10 volts. samsung is famous for bad caps. if the cap feels buldged than this is the problem
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