The stand by light blinks seven times.I have unplugged the tv for over night, even for days at a time. How ever sometimes it will turn on. When it does turn on the picture is fine and the tv works good.
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Here's my suggestion , unhook all the external components to the TV
and leave the TV unplugged for more than a few minutes (a
day/overnight). The next day plug the TV into the wall outlet (not the
powerstrip) without anything hooked up to it, and turn it on. See if it
comes on. Sometimes unplugging for a few minutes/hours is not long
enough for it to reset itself.
KV-32HS510 and KV-27HS420, seven times blink error code shows problem in Horizontal deflection circuit.
There are many possibilities like dry solder joints, weak capacitors, Horizontal transistor short or flyback transformer fried etc.
If you have little experience of TV repair and good solder skills and have necessary tools to test / check defective parts, then you can make it. you also need to have related service manual to see board location, schematics and part numbers.
My T.V. wouldn't turn on. The standby light was flashing six times, then four, then seven...I called Sony and they told me to unplug it for a couple of minutes, then try it again...didn't work....BUT, I have found a solution:
Try unpluging your T.V. for 4 hours+, then turn it back on. Worked for me! It's called a "hard reset" by sony. I had my T.V. unplugged for the whole day though.