HP Xw9300 HP xw9300 Service and Technical Reference Guide - Page 144

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. Disconnect all internal power supply cables. 2. Plug in the AC power. • If the green BIST LED on the rear of the workstation is lit AND the fan is spinning, the power supply is functional. • If the green BIST LED is not lit OR the fan is not spinning, replace the power supply. Table 5-24 Power Supply Problems Problem Cause Solution Power supply shuts down intermittently. Power supply fault. Replace the power supply. Workstation powered off automatically and beeps and blinks RED two times Processor thermal protection 1. Be sure that the workstation air vents are not activated: blocked and the cooling fan is running. A fan might be blocked or not turning. OR The CPU heatsink assembly is not properly attached to the processor. 2. Open the access panel, press the power button, and see if the fan on the heatsink spins. If the fan is not spinning, be sure the heatsink cable is plugged into the system board header. Be sure the fan is properly seated or installed. 3. Replace the CPU heatsink. 4. Reseat the CPU heatsink and verify that the fan assembly is properly attached. 144 System Diagnostics and Troubleshooting

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System Diagnostics and Troubleshooting
144
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.
Disconnect all internal power supply cables.
2.
Plug in the AC power.
•
If the green BIST LED on the rear of the workstation is lit AND the fan is spinning, the power supply
is functional.
•
If the green BIST LED is not lit OR the fan is not spinning, replace the power supply.
Table 5-24
Power Supply Problems
Problem
Cause
Solution
Power supply shuts down
intermittently.
Power supply fault.
Replace the power supply.
Workstation powered off
automatically and beeps and
blinks RED two times
Processor thermal protection
activated:
A fan might be blocked or
not turning.
OR
The CPU heatsink assembly
is not properly attached to
the processor.
1.
Be sure that the workstation air vents are not
blocked and the cooling fan is running.
2.
Open the access panel, press the power button,
and see if the fan on the heatsink spins. If the
fan is not spinning, be sure the heatsink cable is
plugged into the system board header. Be sure
the fan is properly seated or installed.
3.
Replace the CPU heatsink.
4.
Reseat the CPU heatsink and verify that the fan
assembly is properly attached.