Display Self-Test
Display Self-Test
Before performing this test, be sure you are familiar with the information under
'Display Considerations'.
NOTE:
Before replacing a display, check the following
- 8506 and 8508 displays must be connected to an image adapter.
- 63xx and 85xx systems support either 63xx or 85xx displays.
- 85xx systems with an XGA-2 adapter support 95xx displays.
- 95xx systems support either 63xx, 85xx or 95xx displays.
If the screen is rolling, replace the display assembly.
If that does not correct the problem, replace FRUs in the following
order until the problem goes away:
- Display adapter (any type)
- System board
- Bus adapter (if used)
If the screen is not rolling, do the following:
- Power-off the computer and display.
- Disconnect the display signal cable.
- Power-on the display.
- Turn the contrast to its maximum position.
- Turn the brightness control to the center (or maximum) position.
Check for the following conditions:
- You should be able to vary the screen intensity by adjusting the contrast and brightness control.
- The screen should be white or light gray, with a black margin (test margin) on the screen.
NOTE: The location of the test margin varies with the type of display. The test margin
might be on the top, bottom, or one or both sides.
If you do not see any test margin on the screen, replace the display. If there is a test margin on the screen, replace the FRUs, in the following order, until
the problem goes away:
NOTE: Certain adapter failures can cause video problems. Before replacing any FRUs, remove any option
adapters to see if the problem disappears.
- Display adapter (any type)
- System board
- Bus adapter (if display adapter is used)
- Display
NOTE: During the first two or three seconds after the display is powered on, the following might occur
while the display synchronizes with the computer.
- Unusual patterns or characters
- Static, crackling, or clicking sounds
- A 'power-on-hum' on large displays.
A noticeable odor might occur on new displays or displays recently removed from storage.
These sounds, display patterns, and odors are normal, do not replace any parts.
If you are unable to correct the problem, go to 'Undetermined Problem'.
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