Solving Power Supply Problems; Testing Power Supply - HP Z800 Maintenance And Service Manual

Table 6-1 Minor problems (continued)
Problem

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. Disconnect the AC power.
2.
Remove the power supply.
3. If necessary, disconnect the PCIe power cable from the graphics card.
4. Plug in AC power and verify the following:
If the green BIST LED 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.
●
See the Rear panel components section of this service guide to locate the BIST LED on this workstation.
Table 6-2 Power supply problems
Problem
Power supply shuts down
intermittently.
ENWW
Cause
Cause
Power supply fault.
Possible Solution
LED does not illuminate (see
supply on page
supply.
Solution
Replace the power supply.
Troubleshooting scenarios and solutions
Testing power
225), replace the power
225