Hello again everyone, its been a long time since COVID, but im back at it again with this TV it just failed and I found my own post and decided to do an update

The TV was working great for about gosh 4-5 years, recently it started flickering on HDMI input then recently the VOLUME keeps going up on its own.

Now the damn thing doesnt even turn on anymore seems like its failing its diagnostics and not starting up so i managed to find the correct repair manual from a russian website, NO thanks to google or GEMINI they are absolutely useless they promote buying a new TV or...