12V Bus Faults - IBM eServer 445 xSeries Hardware Maintenance Manual And Troubleshooting Manual

12v bus faults

These bus faults generally prohibit an orderly shutdown of the server. If the server
fails, the indicator lights on the front of the server are not lit, and the server will not
power-down using the power button:
1. Disconnect power cord from power source, wait 20 seconds, and reconnect.
2. Turn on the server.
3. Check error logs for one of the following error messages and take the indicated
Note: See Chapter 8, "Parts listing, Type 8870," on page 249 to determine which components are replaceable
by the customer, and which components should be replaced by an IBM field service technician.
Error message
12v A bus fault
12v B bus fault
12v C bus fault
12v D bus fault
12v E bus fault
12v F bus fault
12v G bus fault
12v H bus fault
actions.
FRU/action
1. VRM on I/O board
2. I/O board
3. Top power board
1. Memory VRM on SMP Board 2 (top)
2. SMP Board 2 (top)
3. Top power board
1. Microprocessor VRM 1 on SMP Board 2 (top)
2. Microprocessor VRM 4 on SMP Board 2 (top)
3. SMP Board 2 (top)
4. Hard disk drive (DASD) card
5. Top power board
1. Microprocessor VRM 2 on SMP Board 2 (top)
2. Microprocessor VRM 3 on SMP Board 2 (top)
3. SMP Board 2 VRM (J44)
4. SMP Board 2 (top)
5. Top power board
1. Center plane VRM
2. VRM on PCI-X board
3. Center plane
4. PCI-X board
5. Top power board
1. Memory VRM on SMP Board 1 (bottom)
2. SMP Board 1 (bottom)
3. Top power board
1. Microprocessor VRM 1 on SMP Board 1 (bottom)
2. Microprocessor VRM 4 on SMP Board 1 (bottom)
3. SMP Board 1 (bottom)
4. Top power board
1. Microprocessor VRM 2 on SMP Board 1 (bottom)
2. Microprocessor VRM 3 on SMP Board 1 (bottom
3. SMP Board 1 VRM (J44)
4. SMP Board 1 (bottom)
5. Top power board
Chapter 7. Symptom-to-FRU index
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