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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 8878 and 8879," on page 23 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
System-error log message
QA Cache 1.8V Power Good Fault
QA Vcc PLL Power Good Fault
QB Cache Power Good Fault
QB Vcc PLL Power Good Fault
Remote Login Successful. Login ID:
Resetting system due to an unrecoverable error
SAS Backplane Configuration is incorrect.
SCSI 1.8V Power Good Fault
Single fan failure
142
IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide
Action
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
1. Reseat the microprocessor tray.
2. (Trained service technician only) Reseat the microprocessors.
3. Reseat the microprocessor VRMs, if any are present.
4. (Trained service technician only) Replace the microprocessor
tray.
Information only
Check the following light path diagnostics LEDs for faults:
Note: Make sure you re-enable the memory in the
Configuration/Setup Utility program. See, "Memory problems" on
page 94.
1. Microprocessors
2. DIMMs
3. Memory card
4. Microprocessor tray
5. I/O board assembly
1. Reseat the SAS power/I2C cable (from the SAS board to the
PCIX board).
2. Replace the SAS power/I2C cable.
3. Replace the SAS backplane.
4. Replace PCIX board.
1. Reseat the I/O board.
2. Replace the I/O board.
Replace any missing or failed fans or power supplies.
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