Quick update for everyone who gave me their advice. I left the TV without a cover for another 10 days, replaced the broken cooling pad on the motherboard, cleaned the LVDS connectors with isopropyl and it is working properly again. It has worked for over 15 hours with no sign of a problem.
Thank you all for your advice.

Hi, it's mostly between 20-25°C. It was standing for a few days, but with the casing on, so there was only restricted airflow. I will try letting it stand for some time with the covers off in the sun and then try again.

There was some oxidation on the upper part of the mainboard that I already cleaned, but that didn't cause any shorts (checked the caps and the transistors). I will attach a picture. Everything else looked good. Obviously, I don't know how it looks underneath the BGA. The only other mentionable thing would be that the thermal cooling pad from the MB chip crumbled off....

Ok, thanks everyone for the recommendation. I will let it stay for a week and hope for the best....

Hello,

I'm trying to fix a TV that got damaged by rain (open window during a storm).

The TV at first would start up and work completely normal, with no lines on the screen or anything. But after about 30 seconds, it turned itself off. After it shut itself down, starting it up directly afterward is no longer possible.

The standby light is red and it blinks once on the power-on command by the remote. The relay also does not click anymore when plugged into the wall.

Standby voltages are all present and stable, approximately 13V for the 20V line...

Hello, I'm trying to learn how to repair TV's ...