Monitor shows up in system prefs but no video
I noticed a bit of a burnt electrical smell this morning when I first un-slept my MBP then no video from the Thunderbolt display. The Thunderbolt display *does* show up in Preferences > Displays, just no picture/video.
1. Pugging it into several different AC power sources, swapping the power cable out. Still no picture.
2. A different macbook pro as a video source. Still no picture.
3. Plugging a MBP into it with a separate thunderbolt cable. Still no picture.
So I'm wondering:
Does the fact that the TB display shows up in Displays on the MBP suggest/confirm that the PSU is OK? Does the fact that it shows up in Displays on the MBP suggest/confirm that the logic board is OK?
I'd like to be able to order parts before disassembling it.