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55SJ8500 won't turn on. red blinking light

I have a 55 in LG TV. Similar to other threads related to screen not powering and on red light blinking 3 times. After that the red light disappears for about 10 min and then returns. Any attempt to turn back on yields the same result…light blinks 3 times then goes away.

I’m relatively inexperienced when it comes to this type of stuff but willing to mess with things to try a fix. I’ve seen several posts concerning capacitors replacements but also some other posts indicating the issue could be coming from multiple sources.

Where would you recommend problem shooting first?

Update (06/26/2019)

I got the back off. Here are the pics of the two boards.

after taking the back off I plugged unit back in. Screen came on but was not responsive. Unplugged and plugged back in. Now red light. I do have a green light flashing on the power board.

Update (06/26/2019)

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I added pictures but they don’t seem to want to post. :(

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Bob Heath pictures posted properly. thanks. Let's see what we got....

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I just tested the cable linking the two boards at each of the pins. I got the expected values as stenciled on the board. I’m using an analog meter, so the stand by power appears to between 3 and 4 volts.

I tired earlier tonight and got nothing on any of them but perhaps I was not probing correctly.

I be gone back to confirm a few more times. I’m now getting all of the expected values.

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Following up on this thread…any suggestions?

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So you checked the voltages on your connector on the power board and those all checks out. Your stby voltage sounds good. That would mean your power board is okay.

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Bob Heath  right now it does sound like a power board issue. We would need to see what boards your TV has. I have not seen bad capacitors in a while. Samsung was the bigger offender with bad caps. LG has issues with poor backlight arrays. It will help if you can post some pictures of your boards and layout etc. with your question. Remove the back from your TV and take some good pictures. Post those with your question iFixitでの質問に画像を追加する方法. check the connector that has the cable from the power board to the main board. All the voltages should be stenciled on your power board. Check the standby voltage first. No standby voltage=bad power supply. Let us know what you get.

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Replaced the main board. Working good as new now.

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Bob Heath さん、ありがとうございました!
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