Lynx II black screen, but sound and buttons okay

[MAC-42]

I picked up a couple of broken Lynx IIs recently to see if I could make a working one from the parts. The first one I obtained was in really good cosmetic condition, but when I put a game in, all I got was a black screen--all of the pixels were active and were black--with the backlight on. No sound, no apparent response to button inputs. The second one I found looks like it has been dropped. Partially shattered faceplate over the LCD, bits of the case cracked. When I plugged a game in it, though, the screen came to life--well, half of it; the other half looks to have been damaged in the fall--and sound came from the speaker and the buttons responded. I took a guess that the "clean" Lynx had had its chipset blown to kingdom come, and that by swapping the board from the "dirty" Lynx in, all would be well. Well, I got sound out of the clean one after the swap and the buttons respond to input now, but the screen is still all black. Not blank, like nothing is happening at all, but rather, as I say, all of the pixels are lit up black. Does this indicate a bad LCD? I'm guessing, as the board has now been swapped out with what appears to be a known working board, that the problem doesn't lie there. I'm new to the Lynx--I ended up with a Gameboy as a kid, but always loved the Lynx from afar. So, any ideas or help would be appreciated. Thanks.

[GadgetUK]

There are two different revisions of the Lynx 2, and the screens are not interchangeable. That said it could be that the screen is faulty, but I think it's more likely you've got 2 different types there.

[LX.NET]

What are the revision numbers on each of the boards?

[MAC-42]

Both boards are Rev. A boards. As I mentioned, either board will make the "clean" Lynx power up with this dark screen; the transplant board, however, actually seems to get a response from the system in terms of sound and input. (Can't actually get a visual confirmation of button pushes, obviously, but I hear the appropriate sounds when things are pressed.)