Hardware 3DS XL - Strange Issue With Top Screen

3kidsinAustin

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Been a longtime lurker here, great info that has helped me with several console and handheld repairs. I am looking for some help on a 3DS XL that I picked up recently - has symptoms that are making me scratch my head. Purchased unit with a broken hinge, bad digitizer, and faulty top screen. Have new parts on the way.

The top screen backlight powers on, but no image. Lower screen looks fine, and the unit boots up without difficulty. Here are steps I've taken so far in attempts to diagnose:

1) Checked cable connections for top screen, camera, and speakers. Removed and reinstalled with connectors fully seated.
2) Left camera cable disconnected, in case that was causing a fault for the top screen.
3) Installed a new top screen (main cable only into motherboard).
4) Disconnected and reconnected wifi chip.

All the steps above resulted in the same issue - backlight on, but no image on screen.

I have not yet opened the top shell, only because I figured I would wait until the new housing arrives to help me remember how it all goes back together.

Any guidance would be greatly appreciated!
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