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Service Hints & Tips

Document ID: GSMH-3DBG94

TP Dock II - External Display Diagnostics

Applicable to: World-Wide

SYMPTOM:
The screen is rolling on external display

SOLUTION:
Test another external display on the Dock II. If the other display does not have the same problem. Replace the defective display.
If both displays have the same problem replace parts in the following sequence:

If the external display is attached to Dock II:
- Main card of Dock II

If the external display is attached to a display adapter installed in the Dock II:
1. Display adapter
2. Main card of Dock II
3. Riser card of Dock II

If the screen is not rolling, do the following to run the display self-test:
1. Turn off Dock II and the external display.
2. Disconnect the external display signal cable from Dock II
3. Turn on the external display.
4. Turn the contrast control to its maximum position.
5. Turn the brightness control to its center detent position.

Check for the following conditions:
The screen should be white or light gray, with a black margin as described below:
- 2-20 mm (0.08 - 0.79 in.) wide on one or both sides
- 2-50 mm (0.08-1.97 in.) wide on the top, bottom, or both sides
- For other test patterns, see the appropriate display manual.

The screen contrast and brightness controls should vary the intensity of the screen.

If the external display does not meet these specifications, replace the external display.

If the external display meets these specifications, replace FRUs in the following order one at a time until the problem is corrected.

Note:
If the replaced parts did not resolve the problem, put the original parts back in the Dock II. Do not replace non-defective parts.

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	14-01-97
	Last Updated	10-08-98
	Revision Date	07-08-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad Docking Stations
	Machine Type	3546
	Model	001
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes