Got a Fluke 88 meter. The only the that lights up is the bottom of the screen, nothing else. Can anyone tell me what's wrong or have any solutions to fix it?

 

Try changing the battery/batteries.
The user manuals for your meter are available from the Fluke website, here:
http://www.fluke.com/Fluke/usen/Support/Manuals/default.htm?ProductId=56148

Fluke's page for your DMM:
http://www.fluke.com/fluke/usen/digital-multimeters/fluke-88v.htm?PID=56148

 

Some LCD to PCB interfaces use a partitioned conductive rubber like strip that makes electrical connection with contacts on the LCD glass and the circuit board. They depend on careful alignment and some sort of clip to hold it in place. It is possible if your meter uses that type of interface it could only need physical adjustment. But I dont know if the 88 is that way.