NEC PowerMate V486 Series Service Manual page 116

4-10 Maintenance and Troubleshooting
Problem Symptom
Monitor malfunction Unable to synchronize display.
Wavey display.
Blank display.
Communication No or bad data when
error communicating.
Table Section 4-3 Problems and Solutions
Solution
1. Adjust the monitor's
synchronization knobs.
2. Check that the monitor's
resolution matches the video setting
or the video driver used (see
Section 1). The NEC SVGA Monitor
supports up to 1024 x 768. Most
monitors don't support resolutions
above 640 x 480 (VGA monitors).
3. Check that the utility is not
selecting a refresh rate/resolution
that is not supported by the monitor.
4. Check that the driver used
matches the capabilities of the built-
in video controller and DRAM.
1. Check that the computer and
monitor are not near motors or
electric fields.
1. Check that built-in VGA (see
Section 2) or optional video board (if
installed) is enabled.
2. Check that the monitor power
ON/OFF switch is ON.
3. Check cable connections
between the AC power supply and
monitor.
4. Adjust brightness and contrast
controls on the monitor.
5. Check cable connections
between the monitor connector and
the system board (or optional video
board).
6. Replace system or video board.
7. Replace monitor.
1. Check cable connections
between system board and device.
2. Check that the interface port is
selected.
3. Test or replace device and
interface cable.
4. Replace system board.