Screen comes on for 3 seconds, then all black with audio.

[Justin_209]

Every time i turn on my tv the screen comes on clearly for around 3 seconds then goes black.

LG Electronics 60UB8200 60-Inch 4K Ultra HD Smart LED TV (2014

 

[Turbo_]

Every time i turn on my tv the screen comes on clearly for around 3 seconds then goes black.

LG Electronics 60UB8200 60-Inch 4K Ultra HD Smart LED TV (2014

honestly, I can't tell you for sure what it is but I work with live production and one of our iMacs did the same thing and it turned out to be a fried motherboard. doubt your tv has a fried motherboard though lol.