Hi. I inherited one of these in a non-working order.
The unit powered on. Backlight on, but no picture or sound.
After a bit of reading on here and the internet in general, and some YT vids, I came to the conclusion it must be the T-con board. I think I even did some voltage tests to confirm this. Unfortunately, I didn't take note of the power LED diagnostics.
I order an exact replacement from AE for about $11. Ordered a second from a different seller for about the same.
The first one arrived and I just installed it. Initially it blinked the red LED 5 times. I reseated the cables to the T-con board and powered again.
No backlight this time - just Continuous alternating orange(amber) and green light. I can't find any reference to this in the service manual or on the web.
What did I mess up?