red power blink of 3 times pauses and keeps repeating the 3 blinks.

I’ve got a Toshiba model 55wx800u doing the same thing. I’ve tried all the tricks to reboot etc. I can’t read the graph at bottom of the article. Can you repost the graph. I’m getting 3.2 volts at the AC detect power-sig and power tv pins at pj91. Getting 12 vdc on pj90. Tries to start up but power, power button blinks blue about 12 times and then I hear a click on power supply and it repeats itself before finally going into a red power blink of 3 times pauses and keeps repeating the 3 blinks. I replaced the main board but didn’t fix. Same symptom after putting in main board. I did notice after replace main board a blue light appears on board when I’m attempting to start tv. Light on main board goes off once front power switch starts blinking. I had ordered the power supply board but the company didn’t ship the power board do to no supply but sent me the main board. I can hear clicking every time the power up tries over and over about 3 -4 times before going red blinking mode.

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@mharnes does the picture on the bottom of my answer not enlarge for you, if you click on it? Let me know if that works. If not I convert your comment to a question and we can try and work on it with you.

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Your graph enlarges but is blurry. I replaced both the main board and the ps board. Problem is the same. I’m getting all my out voltage from ps board 3.5, 5 and 12 volts. I also get a tiny green dot to light up on the main board when I turn set on with remote. I hear and feel the ps relay clicking and it attempts about 5-6 times before going back into a red power switch flashing 3 times pause then flashing again and again until on turn of tv and restart. I’ve been told and my research says it’s either ps or main but I have replaced both. Could it be the IO board? No sound or picture. Any way to send a 2 minute video of issue? Marvin, mharness3@live.com

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Anyway for Me send a 2 minute video of tv.

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@mharnes you can add a short video to your QUESTION. Just edit it and use this guide Adding images to an existing question Treat your video like you would insert a picture.

Also, post some picture of all of your boards.

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It doesn’t allow an edit when I click on option on my post …only has 3 choices which is permalink, history and subscribe.

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