Re: LG 55EC930V OLED - 3 Second Power No Display

Respected colleague,
who can help in finding the error with LG OLED 55ec930v, which is talked about a lot here, but I did not come across a similar error.
The TV cannot be turned on (only 3sec power no display).
When I use only -power on the service remote the TV will not start every time, and when it starts, the picture is perfect for 2-3 minutes, after which it darkens and turns off.
Has anyone had a similar malfunction and how did they solve it?