Solving Screen Problems - HP ProSignia 120 Maintenance And Service Manual

Solving Screen Problems

IMPORTANT: Conduct all tests on a working monitor. If the recommended actions do
not solve the problem, replace the display. If the problem persists with a new display,
replace the system board.
Problem
Characters are dim.
Screen is blank.
Computer screen is blank and
the screen on an external
monitor displays information.
Screen is blank and the
power/suspend light is
blinking.
Screen is blank and the
power/suspend light and the
battery light are blinking.
External monitor does not
display information.
Small red, green, or blue spots
appear on the computer CTFT
display.
Table 2-26
Solving Screen Problems
Probable Cause
The brightness or contrast
control (if applicable) is not set
properly.
Computer screen is in direct
light.
Display is damaged.
QuickLock/QuickBlank was
initiated.
Screen save was initiated after
the Power Management
timeout period.
Brightness or contrast needs
adjusting.
Screen has overheated.
Display was switched to the
external monitor.
System initiated Suspend.
System has entered a critical
low-battery condition.
External monitor was
connected after the computer
was turned on.
The external monitor signal
cable or power cord is not
properly connected.
Small spots, called on-pixels,
often appear on CTFT screens.
Compaq limits the number of
these on-pixels to 0.003
percent.
Recommended Action(s)
Adjust the control(s) with the hotkeys: Fn+F9
and Fn+F10.
Tilt the display or move computer.
Replace the display.
Enter the password to exit
QuickLock/QuickBlank.
Press any key or click the mouse.
Adjust the control(s) with the hotkeys: Fn+F9
and Fn+F10.
If computer is in direct sunlight, move it and
allow it to cool.
Press the Fn+F4 hotkeys to display
information on the computer screen.
Press the suspend button to exit Suspend.
Enter the power-on password if prompted.
Immediately connect the computer to an
external power source or replace the battery
pack.
Press the Fn+F4 hotkeys to switch to the
external monitor.
Ensure that the cables are properly
connected.
No action is required.
Continued
Troubleshooting 2-31