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 power cords.
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.
3. Remove the adapters and disconnect the cables and power cords to all internal
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
110 for the minimum configuration).
4. Reconnect all power cords and turn on the server. If the server starts
successfully, replace the adapters and devices one at a time until the problem is
isolated.
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.
Power supply LEDs
The following minimum configuration is required for the power supply status LED on
the power supply to be lit:
v
Power supply
v
Power backplane
v
Power cord
The following minimum configuration is required for the server to start:
v
One microprocessor
v
One 512 DIMM
v
One power supply
v
Power backplane
v
Power cord
The power supply has one LED. When the minimum configuration is present, the
power supply status LED displays either green or amber, and is either lit or flashing.
The following table describes the conditions that are indicated by various actions
and colors of the power supply status LED:
Table 12.
Color
Condition Description
Action
none
OFF
No ac power to the power
supply
Make sure that the power
supply is receiving ac power
from a known good source.
Green
Lit
AC power is present and the
power supply is operating
correctly.
None
Green
Flashing
AC power is present but the
server is turned off. The power
supply is producing 5v standby
power.
Turn on the server when you
need it to run.
108
IBM System x3610 Type 7942: Problem Determination and Service Guide
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