Display Problems - Compaq AP400 Maintenance And Service Manual

4-8 Diagnostic Tools

Display Problems

This section identifies some quick checks for display-related problems.
Problem
Screen is blank.
Graphics colors are wrong.
Characters are dim.
Monitor does not function properly when used with the
energy saver features.
Blurry display or requested resolution cannot be set.
Table 4-5
Solutions for Display Problems
Possible Solution
1. Monitor is not turned on and the monitor light is not on. Turn
on the monitor and check that the monitor light is on.
2. Screen save has been initiated. Press any key or move the
mouse to light the screen. Wait a few seconds for the
screen to be active.
3. Check the cable connection from the monitor to the
workstation and check the grounded AC outlet.
4. The brightness needs adjusting. Adjust the brightness
control.
5. The QuickBlank feature has been enabled through Security
Management. Run Computer Setup and disable the
QuickBlank feature.
6. The energy saver feature has been enabled. Press any key
or type the password. Wait a few seconds for the screen to
become active.
7. The RGB (Red, Green, Blue) input switch on the back of the
monitor is incorrectly set. Set the monitor's input switch to
75 ohms. If there is a sync switch, set it to External.
8. If a fixed-sync monitor is used, be sure that the monitor can
accept the same sweep rate as the resolution chosen.
9. Check that the graphics adapter is fully and properly
inserted in the PCI or AGP slot.
1. If the BNC cable is used, make sure that the Red, Green,
and Blue BNC cables are connected to the corresponding
monitor connectors.
2. Be sure the monitor's RGB inputs are set to 75 ohms.
1. Adjust the monitor's brightness and contrast controls.
2. Check that the video cable is securely connected to the
video card and monitor.
3. Set the RGB switch (and sync options, if available) to 75
ohms, with the sync set to External. Refer to the
documentation included with the monitor.
A monitor without the energy saver feature is being used
with energy saver features enabled. Disable the monitor
energy saver feature.
If the graphics controller was upgraded, the correct display
drivers may not be loaded. Install the correct display
drivers included in the option kit.
Continued