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Most likely the LCD inverter has gone bad. This is the part that provides power to the back-light of the display. In order to replace it, you'll have to get the part number of the LCD. Be aware, they used different LCD in the same size display. It will require removing the bezel and removing the screws that hold the LCD in place so you can get to the back to read the part number of the LCD. The inverter shouldn't cost that much, but if you have a shop do the repair, you're looking at $125-$175. good luck.
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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.