Black Screen, Led Green, And No Osm Present - NEC MultiSync LCD2080UX -BKA Service Manual

2.2 Black Screen, LED Green, and No OSM Present

Is 18V available at CN2A1 Pin 10,11,12.13?
Is 3.3V available at CN2A1 Pin 4?
Is fixation 0V available CN2A1 Pin 3?
NO
YES
Is there a DATA input available at the input circuit (In
such cases as IC551/IC552 pin 8)?
YES
NO
Is 3.3V available at IC401 VDD3.3?
Is 2.5V available at IC401 VDD2.5?
NO
YES
Is 130MHz inputted into IC401 W13?
Is 125MHz inputted into Y13?
However, clock is not continuance because spectrum
diffusion irregularity hangs.
NO
YES
Is the pulse input into IC401 C1?
Check peripheral circuits of IC804 or the power supply.
Check peripheral circuits of IC551/IC552.
Is CN551 inserted properly?
Check the power supply.
Check peripheral circuits of
X402, IC403.
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