KD-55X8005C no power when LVDS cable is plugged into main board

hi

i have a SONY KD-55X8005C and last week all of a sudden it went off with no power, i replaced the power board and t con board and had constant green/orange blinking

ive done the latest update via usb update which seemed to go ok but after it had finished it wouldn’t power again.

after tinkering around i have found out that if i disconnect the LVDS cable from the main board all powers up, backlights lit up sound etc but obviously no picture

i actually now think my original power board and tcon are ok because i have tried with both of them again and getting the same.

could it be the LVDS cable or the main board

any suggestions would be greatly appreciated

thank you