Hello! The source voltages reach the main board well?
yep all the voltages well
Then the problem is in the main board, the information is not coming to the screen, it can be a problem in the line of the LVDs or micro.
I already checked and it's ok, I also checked the flexes that come to the screen, nothing too, I also tested the black data cable. screen .....
It is not main board, if not it would not have sound, or would not turn on, for me it is a problem of the t-con.es my personal opinion.