Swapping modules that might be defective with others known to be good is generally an ideal way to find the module responsible for the problem. A failure symptom is rarely caused by more than one module, so you will not usually need to replace more than one to correct a particular failure.
After you replace a module, the notebook will normally be in a confused state and lock up when you apply power. If this happens, press the reset button: this turns the notebook off, so that you can restart it in a known state.
Verifying the Repair
Before returning the repaired notebook to the customer, verify the repair by running the following tests:
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•Function Tests. Run tests that check the repaired function, such as those in
•Failed Tests. Run any other tests that failed during troubleshooting.
Troubleshooting and Diagnostics | Service Manual |