IBM System x3550 Type 7978 Problem Determination And Service Manual

Contents

v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 3, “Parts listing, Type 7978 and 1913 server,” on page 89 to determine which components arecustomer 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 atrained service technician.System event/error log message ActionCPU n non-critical over temperature warningn = the microprocessor number 1. Make sure that the fans are operating, that there are noobstructions to the airflow, that the air baffles are in place andcorrectly installed, and that the server cover is installed andcompletely closed.2. (Trained service technician only) Make sure that the heat sinkfor microprocessor n is installed correctly.CPU n non-recoverable over temperature fault 1. Make sure that the fans are operating, that there are noobstructions to the airflow, that the air baffles are in place andcorrectly installed, and that the server cover is installed andcompletely closed.2. (Trained service technician only) Make sure that the heat sinkfor microprocessor n is installed correctly.3. (Trained service technician only) Replace microprocessor n4. (Trained service technician only) Replace the system board.VRD 1 critical over voltage fault 1. (Trained service technician only) Reseat microprocessor 1.2. (Trained service technician only) Replace the system board.VRD 1 critical under voltage fault 1. (Trained service technician only) Reseat microprocessor 1.2. (Trained service technician only) Replace the system board.VRD 2 critical over voltage fault 1. (Trained service technician only) Reseat microprocessor 2.2. (Trained service technician only) Replace the system board.VRD 2 critical under voltage fault 1. (Trained service technician only) Reseat microprocessor 2.2. (Trained service technician only) Replace the system board.Microprocessor VTT Power Fault. 1. (Trained service technician only) Reseat microprocessor 1.2. (Trained service technician only) Replace the system board.Solving power problemsPower problems can be difficult to solve. For example, a short circuit can existanywhere on any of the power distribution buses. Usually, a short circuit will causethe power subsystem to shut down because of an overcurrent condition. Todiagnose a power problem, use the following general procedure:1. Turn off the server and disconnect all ac power cords.2. Check the power-fault LEDs on the system board. See (“Power problems” onpage 52).3. Check for loose cables in the power subsystem. Also check for short circuits, forexample, if a loose screw is causing a short circuit on a circuit board.4. Remove the adapters and disconnect the cables and power cords to all internaland external devices until the server is at the minimum configuration that isrequired for the server to start (see “Solving undetermined problems” on page86 for the minimum configuration).84 IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide