I'm seeing many people are having the same problem. I was wondering if the other problems just happened out of nowhere? My tv was perfectly fine, worked great. I dusted it off one day and now it won't turn on. I get the standard power on sound but it then goes in standbye mode and blinks in 2 beat phases. I read that it is power supply. I just thought it was wierd how it just all of a sudden did this. Anyhow, any information would be awesome. Thanks!
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Blinking led in sony tv is its self dioganising function. 7 blinks by it means the horizontal output voltage increased above 33k.
You have to check the power supply stage of you tv. Normally in sony tv dry soldering can happend in the power supply stage. It will lead to unregulated voltage output from the power supply. Resolder all the points in the power supply section it will solve your problem.
I suspect a power board failure but to be sure i would have to know how many times your light is blinking as there is a code to it. please repost with number of blinks. This is a common problem with this brand of sony televisions as far as I can tell from what i have been reading online. If you are still under warranty you should contact Sony. If you need further help from an expert please let us know the number of blinks.
I would try a power drain: Unplug the TV's power cable so the TV is not grounded to the house. Then press and hold in the TV's own power button for one minute to drain the capacitors. Plug the TV back in and see what happens. If the TV will still not turn on, I would say you have a problem with the TV's mainboard as a dead power supply will not light any LED's for you.