I am experiencing the same issue. The repair shop years ago looked at it and could not figure it out.

I decided to give another go at this but I am missing the flex cable that connects the LCD screen to the board behind it. It is a 3 inch cable very basic lcd type cable. I have no idea the part number or anything. I downloaded some manuals but they do not display the parts.

Anyone know the parts catalog for this? Of if anyone has a dead unit that can sell me that part. I can take a pic if needed of what I need.