Solving power supply problems
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.
Disconnect all internal power supply cables from the system board.
3.
Plug in AC power.
●
If the green BIST LED (illustrated below) on the rear of the workstation is illuminated and the
fan is spinning, the power supply is functional.
●
If the green BIST LED (illustrated below) is not illuminated or the fan is not spinning, replace
the power supply.
Figure 5-1
Table 5-4
Power supply problems
Problem
Power supply shuts down
intermittently.
108 Chapter 5 System diagnostics and troubleshooting
Testing power supply with BIST LED
Cause
Power supply fault.
Solution
Replace the power supply.
ENWW