Chosen Solution
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.
