External Display Self-Test

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

External Display Self-Test

External Display Self-Test

If the display problem occurs only when using an external display, use the following instructions to correct the problem.

Note: Before you replace a display, check the following list to see if it is connected correctly.

8506 and 8508 displays must be connected to an Image Adapter/A or an Image-I Adapter/A.
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.
ThinkPad models support either 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:

Video card
Display adapter (any type)
System board
Bus adapter (if used)

If the screen is not rolling, run the display self-test as follows:

Power-off the computer and display.
Disconnect the display signal cable.
Power-on the display.
Set the contrast to its maximum position.
Set the brightness control to the center detent position.

Check for the following conditions:

You should be able to vary the screen intensity by adjusting the contrast and brightness controls.
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 a test margin on the screen, replace the display. If there is a test margin on the screen, replace the system board.

On ThinkPad Models 700, 700C, 720C, 720C, do the following:

Video card
System board

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