HP Xw6600 HP xw6600 Workstation Service and Technical Reference Guide - Page 121

Solving power supply problems, Testing power supply,

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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. 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 is not illuminated or the fan is not spinning, replace the power supply. Figure 5-1 Testing power supply with BIST LED Table 5-3 Power supply problems Problem Cause Solution Power supply shuts down intermittently. Power supply fault. Replace the power supply. Workstation powered off automatically and the Power LED flashes red 2 times (once every second), followed by a 2-second pause. Processor thermal protection 1. Ensure that the workstation air vents are not blocked activated. and . A fan might be blocked or not 2. Open the access panel and press the workstation turning. power button. OR 3. Verify that the system fan is running. The processor heatsink fan assembly is not properly attached to the processor. 4. Verify that the processor heatsink fan spins. If the heatsink fan is not spinning, ensure that the fan cable ENWW Customer Self Help 111

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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.
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 is not illuminated
or
the fan is not spinning, replace the power supply.
Figure 5-1
Testing power supply with BIST LED
Table 5-3
Power supply problems
Problem
Cause
Solution
Power supply shuts down
intermittently.
Power supply fault.
Replace the power supply.
Workstation powered off
automatically and the Power LED
flashes red 2 times (once every
second), followed by a 2-second
pause.
Processor thermal protection
activated.
A fan might be blocked or not
turning.
OR
The processor heatsink fan
assembly is not properly
attached to the processor.
1.
Ensure that the workstation air vents are not blocked
and .
2.
Open the access panel and press the workstation
power button.
3.
Verify that the system fan is running.
4.
Verify that the processor heatsink fan spins. If the
heatsink fan is not spinning, ensure that the fan cable
ENWW
Customer Self Help
111