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Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the
power distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of
an overcurrent condition. To diagnose a power problem, use the following general procedure:
Step 1.
Turn off the server and disconnect all power cords.
Step 2.
Check for loose cables in the power subsystem. Also check for short circuits, for example, if a
loose screw is causing a short circuit on a circuit board.
Step 3.
Check the lit LEDs on the operator information panel (see “Light path diagnostics” on page 129).
Step 4.
If the check log LED on the light path diagnostics panel is lit, check the IMM event log for faulty
Pwr rail and complete the following steps. Table 15 “Components associated with power rail
errors” on page 158 identifies the components that are associated with each Pwr rail and the
order in which to troubleshoot the components.
a.
Disconnect the cables and power cords to all internal and external devices (see “Internal cable
routing and connectors” on page 179). Leave the power-supply cords connected.
b.
For Pwr rail A error, complete the following steps:
1. (Trained technician only) Replace the system board.
2. (Trained technician only) Replace the microprocessor.
c.
For other rail errors (Pwr rail A error, see step b), remove each component that is associated
with the faulty Pwr rail, one at a time, in the sequence indicated in Table 15 “Components
associated with power rail errors” on page 158, restarting the server each time, until the
cause of the overcurrent condition is identified.
Table 15. Components associated with power rail errors
Pwr rail error in the IMM event log
Components
Pwr rail A error
• Microprocessor 1
Pwr rail B error
• Microprocessor 2
Pwr rail C error
• Adapter (if one is installed) in PCI riser-card assembly 1
or HDD/ServerRAID-H1110 (if they are present) installed
in the rear two hard-disk-drive kit
• PCI riser-card assembly 1 or rear two hard-disk-drive kit
• Fan 1
• DIMMs 1 through 6
Pwr rail D error
• Dual-port network adapter
• Fan 2
• DIMMs 7 through 12
Pwr rail E error
• Hard disk drives
• DIMMs 13 through 18
Pwr rail F error
• Adapter (if one is installed) in PCI riser-card assembly 1
or HDD/ServerRAID-H1110 (if they are present) installed
in the rear two hard-disk-drive kit
• PCI riser-card assembly 1 or rear two hard-disk-drive kit
• Fan 4
• DIMMs 19 through 24
158
Lenovo System x3650 M4 HD Installation and Service Guide
Summary of Contents for System x3650 M4 HD
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