IBM Power AC922 8335-GTW Handbook page 33

Problem analysis, system parts, and locations
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Does the problem persist?
If
Then
Yes:
Continue with the next step.
Note: Steps 1 - 4 resolve most problems. Ensure that you carefully check steps 1 - 4
before you continue with the next step.
No:
This ends the procedure.
5. Is a single memory DIMM, power supply, or voltage regulator over heating?
If
Then
Yes:
Replace the over heating item. If your system is an 8335-GTC, 8335-GTG, 8335-GTH,
8335-GTW, or 8335-GTX, go to "8335-GTC, 8335-GTG, 8335-GTH, 8335-GTW, or
8335-GTX locations" on page 25 to identify the physical location and the removal
and replacement procedure. This ends the procedure.
No:
Continue with the next step.
6. Is a processor over heating, but the other processor and the graphics processing units (GPUs) are not
over heating?
If
Then
Yes:
Check the thermal interface material (TIM) between the cold plate and the processor
that is over heating. Go to Removing a system processor module from the 8335-GTW
or 8335-GTX system and complete the steps to lift the cold plate off the processor. If
the TIM pad is damaged, replace the TIM pad. To replace a TIM pad, go to Replacing a
system processor module in an 8335-GTW or 8335-GTX system and complete the
steps for removing and installing a new TIM pad. This ends the procedure.
No:
Continue with the next step.
7. Is a GPU over heating, but the other GPUs and the processors are not over heating?
If
Then
Yes:
Replace the thermal interface material (TIM) between the cold plate and the GPU that
is over heating. Go to Removing the graphics processing unit from a water-cooled
8335-GTW or 8335-GTX system and complete the steps to lift the cold plate off the
GPU. Then, go to Replacing the graphics processing unit in a water-cooled 8335-GTW
or 8335-GTX system and complete the steps for installing a new TIM pad. If the
problem is not resolved, replace the GPU. For instructions about replacing a GPU, see
Removing and replacing a graphics processing unit in the 8335-GTW or 8335-GTX.
This ends the procedure.
No:
Continue with the next step.
8. Replace the cold plates. For instructions about how to replace the cold plates, see Removing and
replacing the cold plates in the 8335-GTW or 8335-GTX.
Does the problem persist?
If
Then
Yes:
Go to "Contacting IBM service and support" on page 24. This ends the procedure.
No:
This ends the procedure.
Beginning troubleshooting and problem analysis 19

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