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Blink 6 times unable power on, but ok after many hours

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I’ve a Sony KLV-40S400A that won’t turn on with 6 blinking lights.

The strange thing is if left unpowered on for many hours -12hours, it can power on.

During immediate intervals, 99% chance can’t power on. On with luck after repeatedly power off/on mains then is successful.

Have replaced with another power board from China, which is likely recycled. But the same.

Would anyone able to diagnose what’s likely cause? And why it can turn on after many many hours?

Thank you

Attached pics of the power board. Appreciate if can point to which component likely cause this issue.

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@antecpro that sounds like a capacitor issue on the power supply. Post some images of your boards with your question so we can see what you see. Use this guide Adding images to an existing question for that. Make sure that you have a multimeter so we can hopefully guide you in determining if your power supply functions properly.

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Hi @antecpro ,

I think that the power board is not the problem. You would have to be very unlucky to get the exact same fault condition with a replacement power board, that presumably was guaranteed to work.

A 6 blink error code for your Sony model TV indicates a backlight / inverter problem

Here is a link to the relevant page in the service manual for your TV

It is hard to read but is states:

Number of times STANDBY LED (Red) flashes:

6 times BACKLIGHT/INVERTER ERROR Confirm if input to Q9008 is about 3.3V

Unfortunately this copy of the manual does not have a circuit diagram so you will have to find the location of Q9008 and test from there. I cannot locate it in the picture of the power board you posted so it most probably is on another board, (inverter board perhaps?) but then again my eyes aren't what they used to be.

Hopefully this is of some help.

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