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When you can see a faint image on the screen and the display is
black, the the problem is a backlight problem. This can be caused by a faulty
inverter board or a faulty CCFL lamp. For replacement parts
please check out these WEB sites :-
Usually it is the lcd inverter going bad...if you do a search for your model # and lcd inverter and see if you can find any...also you will be able to very faintly see what is on the screen althought it looks black...if that doesn't work then i may be the backlight in the lcd and a new screen may be needed.
Hope this helps
The contacts of the LCD are probably oxidized because of its age. With the unit out of its care, carefully remove the LCD from its retaining mount. Use rubbing alcohol and a clean q-tip to clean the contacts of the LCD and the small "rubber-like" strips that contact both sides of the LCD. Also, remove the strips and clean the other side and the contact on the main circuit board. Then reassemble.
*Note, if you live in a cold climate, freezing of the LCD could also cause this problem. In that case you must purchase a replacement LCD from Fluke.