Samsung UE43J5500 No red light despite PSU testing good

[madyoyo]

Hi everybody.

I have a Samsung UE43J5500 with a bad main board: No red light, and zero reaction from the remote or the power button. The PSU seems ok: 8.6V when plugged in, 12V and the backlight turning on when disconnected from main board. I also found 3.3v at the ir receiver, the power button also seems ok (i get 1.8v at the key_input1 test point, and it drops to zero when the button is pressed.
Is there anything i can try before tossing this board? I'm running out of ideas

[madyoyo]

Re: Samsung UE43J5500 No red light despite PSU testing good

i've found a schematics for this main board: https://www.electronica-pt.com/esque...ileinfo/82533/

Everything is done inside the microcontroller, so it's basically dead
Its more than likely it was killed by a power surge, being powered on all the time