Solving Power Problems; Solving Ethernet Controller Problems - IBM System x3500 Service Manual

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, System x3500 Type 7977," on page 41 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
Vtt Power Good Fault

Solving power problems

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:
1. Turn off the server and disconnect all ac power cords.
2. Check for loose cables in the power subsystem. Also check for short circuits, for
3. Remove the adapters and disconnect the cables and power cords to all internal
4. Reconnect all ac power cords and turn on the server. If the server starts
If the server does not start from the minimum configuration, replace the components
in the minimum configuration one at a time until the problem is isolated.

Solving Ethernet controller problems

The method that you use to test the Ethernet controller depends on which operating
system you are using. See the operating-system documentation for information
about Ethernet controllers, and see the Ethernet controller device-driver readme file.
Try the following procedures:
v Make sure that the correct device drivers, which come with the server, are
v Make sure that the Ethernet cable is installed correctly.
v Determine whether the hub supports auto-negotiation. If it does not, try
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IBM System x3500 Type 7977: Problem Determination and Service Guide
Action
1. (Trained service technician only) Reseat the microprocessors.
2. Reseat the microprocessor VRMs, if any are present.
3. (Trained service technician only) Replace the system board.
example, if a loose screw is causing a short circuit on a circuit board.
and external devices until the server is at the minimum configuration that is
required for the server to start (see "Solving undetermined problems" on page
161 for the minimum configuration).
successfully, replace the adapters and devices one at a time until the problem is
isolated.
installed and that they are at the latest level.
– The cable must be securely attached at all connections. If the cable is
attached but the problem remains, try a different cable.
– If the Ethernet controller is set to operate at 100 Mbps, you must use
Category 5 cabling.
– If you directly connect two servers (without a hub), or if you are not using a
hub with X ports, use a crossover cable. To determine whether a hub has an
X port, check the port label. If the label contains an X, the hub has an X port.
configuring the integrated Ethernet controller manually to match the speed and
duplex mode of the hub.