HP Xw8400 HP xw8400 Workstation - Service and Technical Reference Guide - Page 121

Solving power supply problems, Testing power supply

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Table 5-3 Minor problems (continued) Problem Cause Possible Solution ● If the power supply fan spins and the BIST* LED lights, then the power supply is good. Replace the system board. ● If the power supply fan does not spin or the BIST* LED does not light, replace the power supply. Solving power supply problems Testing power supply Before replacing the power supply, use the BIST feature to determine if the power supply still works. To test the power supply: 1. Disconnect AC power to the workstation. 2. Disconnect all internal power supply cables. 3. Plug in AC power. a. If the green BIST LED on the rear of the workstation is lit and the fan is spinning, the power supply is functional. b. If the green BIST LED is not lit or the fan is not spinning, replace the power supply. Figure 5-1 Power supply Table 5-4 Power supply problems Problem Cause Power supply shuts down intermittently. Power supply fault. Solution Replace the power supply. ENWW Troubleshooting scenarios and solutions 111

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Problem
Cause
Possible Solution
●
If the power supply fan spins and the BIST*
LED lights, then the power supply is good.
Replace the system board.
●
If the power supply fan does not spin or the
BIST* LED does not light, replace the power
supply.
Solving power supply problems
Testing power supply
Before replacing the power supply, use the BIST feature to determine if the power supply still works.
To test the power supply:
1.
Disconnect AC power to the workstation.
2.
Disconnect all internal power supply cables.
3.
Plug in AC power.
a.
If the green BIST LED on the rear of the workstation is lit
and
the fan is spinning, the power
supply is functional.
b.
If the green BIST LED is not lit
or
the fan is not spinning, replace the power supply.
Figure 5-1
Power supply
Table 5-4
Power supply problems
Problem
Cause
Solution
Power supply shuts down
intermittently.
Power supply fault.
Replace the power supply.
Table 5-3
Minor problems (continued)
ENWW
Troubleshooting scenarios and solutions
111