8820 - Works, but no display
 

I have an 8820 which dropped pretty hard a while back. It connects fine to the computer and the alarms go off when they are supposed to. Only, there is no display.

I have replaced the LCD to no avail. It is plugged in just fine, and I can't find anything obviously wrong with the PCB.

I know this is getting real technical and deep, but if anyone has recovered from this sort of scenario, any help would be appreciated.

Thanks!

There might missing or detached components as you said it been drop. Its pretty much hardware problem.