A series of 40 inch LCD HDTVs by Sony.

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7 red blinks ,3 second gap, repeated when switched on

No ability to switch on, only 7 red blinks that repeat. This is a 200 mh KDL 40 HX 700.

For a few days power off completely allowed normal function, now no ability to power on.

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7 red flashes- main board over heating, can be short on power board or main logic board

I'd open it and look for a burned spot. I'd go for the power board first.

Possibly a cold solder joint.

Here's a video on identifying a cold solder: https://www.youtube.com/watch?v=h5_dBMuJ...

Here's one on repairing it: https://www.youtube.com/watch?v=5dG0fwE7...

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