Solving Power Supply Problems; Testing Power Supply - HP Xw6600 - Workstation - 2 GB RAM Technical Reference Manual

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
Table 5-3 Power supply problems
Problem
Power supply shuts down
intermittently.
Workstation powered off
automatically and the Power LED
flashes red 2 times (once every
second), followed by a 2-second
pause.
ENWW
Testing power supply with BIST LED
Power supply fault.
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.
Cause
Replace the power supply.
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
Solution
Customer Self Help 111