Problem Cause Possible Solution
●
If the power supply fan spins and
the BIST LED illuminates (see
Testing power supply
on page 68), the power supply is
good. Replace the system board.
●
If the power supply fan does not
spin or the LED does not illuminate
(see
Testing power supply
on page 68), replace the power
supply.
Solving power supply problems
This section presents power supply troubleshooting scenarios.
Testing power supply
Before replacing the power supply, use the Built-In Self-Test (BIST) feature to learn if the power supply
still works.
To test the power supply:
1. Unplug the AC power.
2. Remove the internal power supply cables from system board (you do not need to remove power
supply from chassis).
3. Plug in AC power and verify the following:
●
If the green BIST LED on the rear of the workstation is illuminated and the fan is spinning, the
power supply is functional.
●
If the green BIST LED is not illuminated or the fan is not spinning, replace the power supply.
See the Rear panel components section of this service guide to locate the BIST LED on this workstation.
Table 11-2 Power supply problems
Problem Cause Solution
Power supply shuts down
intermittently.
Power supply fault. Replace the power supply.
Table 11-1 Minor problems (continued)
68 Chapter 11 Diagnostics and troubleshooting ENWW
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