Black screen, with slow flashing white LED

Black screen, with slow flashing white LED

I have this exact issue, I have replaced all boards, Main video, power board, and T-conn, but i'm now stuck where this question left off. Black screen, with slow flashing white LED. My tv is the XBR65x850C, but having the exact same issue.

ANSWERS:

Did you ever solve the problem? I am having the same issues. I’ve replaced the power board and main board, but still only get the white flashing LEDs from the remote. At a loss as to what to do next