HP ET115AV HP xw4400 Workstation - Service and Technical Reference Guide - Page 120

Solving power supply problems, Testing power supply

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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 Testing power supply with BIST LED Table 5-4 Power supply problems Problem Cause Power supply shuts down intermittently. Power supply fault. Solution Replace the power supply. 110 Chapter 5 System diagnostics and troubleshooting ENWW

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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
Testing power supply with BIST LED
Table 5-4
Power supply problems
Problem
Cause
Solution
Power supply shuts down
intermittently.
Power supply fault.
Replace the power supply.
110
Chapter 5
System diagnostics and troubleshooting
ENWW