Service Guide

Power Supply LED errors

Use the Power Supply LED information in the following section to troubleshoot power supply problems.

Minimum configuration requirements: The minimum configuration required for the DC Power LED to come on is:
  • Power Supply
  • Power Backplane
  • Processor/PCI Board (With pins 2 and 3 on J23 extension cable connected together to bypass the power switch.
  • Processor/PCI Board (Verify that Processor/PCI Board and System Board are properly connected together.

Table 13 describes Power Supply LED errors and actions.

Table 13. Power Supply LED errors and actions
AC Power LED DC Power LED Description Part/Action
Off Off No power to system or ac problem Suspected part:
  1. Power Supply
  2. Power Backplane
  3. Power ac Inlet Box

Suggested action: Check ac power to system

On Off Standby mode or dc problem Suspected part:
  1. Power Supply
  2. Power Backplane
  3. System Board
  4. Processor Board

Suggested action:

  1. Check processor board cable connector, J33. Move jumper on the J32 extension cable to pins 2 and 3 to bypass power control. If the DC Good LED comes on, press Ctrl+Alt+Delete. Watch the screen for any POST errors. Check the System Error Log for any listed problems. If the system powers up with no errors:
    1. Power Switch Assembly
    2. System Board
  2. Remove the adapters and disconnect the cables and power connectors to all internal and external devices. Power-on the system. If the DC Power LED comes on, replace the adapters and devices one at a time until you isolate the problem.
On On Power is OK N/A

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