I have a switch lite that the arrow control pad reads in all directions but the left. connector lock just above the power connector was off, and I put it back on. I don’t see any bent pins but maybe there is one. putting that back on has returned the backlight so I think that might be my issue, but looking for other ideas before I swap the connector out.
did you test for continuity from main board to L board?
make sure you disconnect battery.
I actually got this working last night. I harvested a connector off a donor board and it works as intended now. it must have had a shorted pin in there. before I swapped it if I unlocked the ribbon cable the button would start working but backlight would stop.