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OptiPlex 5050 Tower Owner's Manual

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Power Supply Unit PSU Built-in Self Test BIST

This system supports a new Power Supply Unit (PSU) Built-in Self Test (BIST). BIST can now be performed by simply connecting the AC power cord to the PSU.

Troubleshooting with BIST

  1. Turn off the system.
  2. Disconnect the power cord from the PSU, and wait for 15 seconds.
  3. After 15 seconds, connect the power cord back to the PSU.
    • If the LED stays on for 3 seconds and turns off, it indicates that the PSU is functional. Continue with troubleshooting steps for other devices.
    • If the LED does not turns on, it indicates a hardware failure. The failed component can be PSU, system board, or any other device.
Power supply unit

Steps to confirm that PSU is defective

  1. Disconnect the power cord from the PSU.
    • CAUTION: Ensure that you take adequate safety precautions before accessing the internal components of your system. See the disassembly instructions in the Service Manual for procedure to access the PSU and its cables.
  2. Disconnect the PSU cables from the system board.
  3. Connect the power cord to the PSU.
    • If the LED stays on for 3 seconds and turns off, it indicates that the PSU is functional. Continue with troubleshooting steps for other devices.
    • If the LED does not turns on, it indicates a PSU failure. Dispatch PSU only.

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