Question TCL 55s403TAAA no video. Audio and blacklight work

[Faulttbreaker]

Hello,

I my TCL tv isn't showing a picture however there is audio and the backlight work. I have replaced the t con board and main board hoping this would solve the issue. Is it possible to check where the problem area is with my digital multimeter?

http://imgur.com/a/oVPCQvk