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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.
When fails to turn on: if you get a front LED blink of 4, 6, or 7 x, then pause, then likely power supply IC is intermittent with temperature. A lot of shops will want to replace the whole board for hundreds more, though. So ask a shop if they can fix this problem to component level 1st recommended.
The Power Supply/ Deflection Board is called the "D" Board. Replacing this Board should fix your problem. You can try to order one from Sony at 1800-222-SONY. If it is not available, you will need to send it to Sony for them to rebuild it. That will cost around $400.00 or so.
I hope this helps,
we have the same porblem. We just unplug ours and wait a couple of weeks while watching another tv plug and un plug it will eventually come on then we dont turn it off again it only goes off if the power goes off.
the power supply is a switched mode. you need to take your tv to a w/shop, and let them check the following.
powersupply rectifier diodes, power trasistor lekage,
diodes, zener diodes,
if a 90-110 volts to the line trasistor,
a line transistor be checked.
the tv simple problem