No graphic display

If blank, or some segments missing, it can be the connector to the main board, (usually a ribbon) or it can be the rubber connector electrode that links the lcd glass to the circuit board connectors. If you have the inclination, and patience, and a steady hand, and are confident... (alot of "and's" there ;-) you can take it apart, remove the LCD display, take it apart (usually by bending a few metal tabs, the thing will come out, and if you gently separate all the layers it will come apart fairly easy. Then you will see the rubber edge connector that goes to what looks like clear glass (but it actually makes contact there) to drive the segments. What you need to do is gently clean the rubber (both sides) and the gold board contacts (leave the glass display conmtacts part alone) then re-assemble the thing and you may get your display back. This symptom can happen to some LCD displays left in extreme temperature cycle enviorments, or other harsh conditions... or a garage for a few years.. You never know ...

If this does not bring it back, check the cconnectors for dirt (if face is detachable, I don't recall on that exact model if it is or not).

and then go further to the driving circuitry on the board.