Image Is Unclear - NEC MultiSync LCD1920NX User And Service Manual

3.2 Image is unclear

Are image still unclear even though [H-SIZE]
and [FINE TUNE] are adjusted?
NG
Is the display used in the ENLARGE mode?
NG
Replace the connection cable that is extended
toward the PC.
NG
Check waveforms on L20, L21, L22 (Is the R,
G, B signal sourceclear?).
OK
END
* For the auto-sync processing of H/V-POSITION, H-SIZE, and FINE TUNE, it is
necessary to use images in the outermost periphery of the video activity area.
During adjustments, use images of full-screen display by WINDOWS.
OK
YES
OK
Failure point
Normal
Failure point
1) Change to resolution of 1280x1024.
2) Adjust [SMOOTHING] function.
Normal
6-7