Chosen Solution
A while back we had a technician working on a Surface Pro 3. He did a dumb and did not isolate the battery before connecting the new display and fried the backlight on the device. We tried multiple confirmed working displays and all yielded the same result: no backlight. It would seem that the problem is board-level. I am attempting repair, but since there seem to be no available boardview or schematic files available for this device, I am at a loss for where to start troubleshooting. Has anyone attempted this repair or have insight into this problem?
I don’t have experience with these devices, other than an old water damaged Surface and there is essentially no information out there so I feel your pain. Hopefully someone more informed will come around but in the meantime, can you take a good quality picture of the area near the screen connector(s)? I can take a quick scan to see if there is anything obvious.
@refectio
Thank you for the response. Here’s what we’ve got. I’ve done a solid visual inspection of the board and see nothing obviously wrong. I have also tested continuity to ground on all display pins, and have that info, but since I have no schematic or board view that doesn’t give me a whole lot to work with either.
I had this same problem. It was the bridge plate between the LCD display cable and the main board. I replaced it and the backlight is working now.
