How to Repair LCD ! Raster ok but no display

AD card (Analog to Digital Card)

Raster ok on the main panel, but no display

• check Data cable and its connector and check video driver supply and video amplifier for missing

• If it is ok then check Bus cable attached between AD Card to RGB driver Card and check AD card supply for adjust contrast finally replace AD card

Any color Missing (RED)

check Data cable for loose contact or break.

Adjust color the help of menu and check bus cable for break  or loose contact between RGB driver to main panel and check any protection component short use on RGB driver card 

Finally Replace RGB driver card. 

 

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Display Fluctuate Problem