LCD Screen Mystery: Why is it Showing a White Grid ?

We're baffled by this strange behavior on our LCD screen. it's displaying a slow-motion white grid pattern, and we can't figure out what's causing it. We've tried to change the TCON Module.
If you have any idea what might be wrong, please share your thoughts in the comments.
We;re hoping someone in the community can help us solve this mystery.

Видео LCD Screen Mystery: Why is it Showing a White Grid ? канала labinside