NEC LCD2080UX - MultiSync - 20.1" LCD Monitor, Service Manual

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5-9
7) The same inspection should be carried out also for INPUT2 (DSUB).
1.5.5 HSYNC Threshold Changeover Check
1) Enter Signal 32 from INPUT1. (1-dot m Outer frame screen)
2) Display the OSM menu, move it to the POSITION tab with the
3
and
4
keys, and press the SELECT key.
3) Adjust the cursor to H.SIZE with the
3
and
4
keys, and operate the + key to shift the H.SIZE by +4 steps.
4) Move it to SMT 2.7V/3.3V in the second tab of the FACTORY mode and make a modification of 1
→
0.
Confirm that the vertical stripes are shifted by about 1cm at that time. (The amount of shift depends on
the type of signal source.) Return it to 1 after the completion of inspection.
1.5.6 SOG SYNC correction Check
1) Enter Signal 33 from INPUT1 and make an SOG connection. (1-dot m Outer frame screen)
2) Move it to SOG SYNC PEAKING in the second tab of the FACTORY mode and make a modification of 0
→
1. Confirm that there appears a phase shift. (The amount of phase shift depends on the type of signal
source.) Return it to 0 after the completion of inspection.
1.5.4
1.5.6
1.5.5