I've got a) an SLCD logic board and b) an SLCD Nexus One with logic board error. Obviously I would like to make a working phone with these two.

The problem is that although the assembled phone turns on, the SLCD screen remains black. First I thought that the screen does not work at all, but then I found out that I can see a faint image with a flashlight. So the problem is that there is no backlight.

The strange thing is that I have another Nexus One, so I verified with the other logic board that the SLCD screen works just fine, including the backlight.

Do you have any idea how can it be that an SLCD logic board doesn't turn on the backlight on the SLCD display? Did you ever encounter this problem?