Keyboard Clock Line Failure

Keyboard Clock Line Failure

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Explanation: The clock line is one of the control lines between the keyboard and the keyboard controller that interfaces the keyboard to the motherboard.

Diagnosis: There is a problem either with the keyboard or with the keyboard controller on the motherboard.

Recommendation:

  • Troubleshoot the keyboard. Make sure that the keyboard is properly connected to the computer and/or reseat the plug into the back of the computer and then restart the system. If necessary, disconnect the keyboard and move it to another machine if possible to test it. If something has been spilled on the keyboard, discard it and replace it.
  • Troubleshoot the keyboard controller by attaching a keyboard from another machine. If the problem goes away, it’s the keyboard, if it doesn’t, then there’s a problem either with the port where the keyboard attaches to the system or the keyboard controller on the motherboard.
  • If none of the above resolves the issue, troubleshoot as a motherboard failure and replace the motherboard.

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