3 
3 LG OLED TV no picture no sound but turns on
LG 55EC930T
The TV still can be turned on by the remote or the power button. I can hear the click from the powerboard and the red LED on the mainboard will be on. But no picture no sound. My nintendo switch can turn on the TV via HDMI as it normal dose.
Tried disconnecting speaker, control button and remote receiver one by one noting worked.
Tried disconnected the T con board. The power can be turned on for 2 second and then it will restart it self. And the power stay on for another 2 second before turning off.
Bought a mainboard and put it in, but issues are same.
Tested the power suppy board. The power to the mainboard showed in the pictures. The power to the T con board are all 25.1V for the 24V pins and -1.2mV for the GRD pins.
Is there anything I can do? Many thanks.
更新 (2020年09月20日)
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Hi, my TV is oled model 55eg 910t. The led standby turns on, but the command I give does not turn on the TV.
The power on and drw on system is checked and safe.
The optical LED on the main board does not light up and also (7200 dl (LED) does not turn on on the main board.
please guide me.
Thanks: Bahram
из pars_eng37@yahoo.comn
My LG TV is showing not program,I can't use the remote the buttons on the TV is not responding
из osmanbah1151990
@osmanbah1151990 This is an old thread. you should start your own thread and post as much info about your TV (make, model, etc.), what it does, and what you have tried.
из bill