A30 Boots To Monitor But No Display On LCD

[fuzzypup]

I purchased an A30 motherboard assembly on eBay that boots fine to an external monitor but will not show display to a known good LCD. The LCD appears to be powered as the Thinklite is energized with Fn+PgUp but no sign of anything on screen. I have tried setting bios display to Both, CRT and LCD with no change.

Any other trouble shooting I could try to find the problem.

[fasterbybike]

Have you checked the cable ?

[rkawakami]

Could be the ribbon cable or the motherboard. If the complete lid assembly (LCD, cable, inverter) works on another system, then that basically leaves the motherboard. On a hunch, take a close look underneath the screw hole in the middle, back of the keyboard (where the "Y" shaped brace goes). Does it look like this:

http://www.kawakami-ca.com/ibm_a31p/

If that area is undamaged, then you may have a problem with the video chip being disconnected from the motherboard or defective. I would also download a copy of PC Doctor for DOS for the A30 from here:

http://www-307.ibm.com/pc/support/site. ... MIGR-41920 (diskettes)
http://www-307.ibm.com/pc/support/site. ... MIGR-56222 (CD)

and run the Video tests.