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.

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:
  1.  Video card
  2.  Display adapter (any type)
  3.  System board
  4.  Bus adapter (if used)

If the screen is not rolling, run the display self-test as follows:
  1.  Power-off the computer and display.
  2.  Disconnect the display signal cable.
  3.  Power-on the display.
  4.  Set the contrast to its maximum position.
  5.  Set the brightness control to the center detent position.

Check for the following conditions:

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:

  1.  Video card
  2.  System board

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