IBM 72335LU - System x3850 M2 Installation Manual

Also see for 72335LU - System x3850 M2: User guide

Contents

v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide 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.Lit light pathdiagnostics LED withthe system-error LEDalso lit Description ActionCPU A microprocessor has failed, ismissing, or has been incorrectlyinstalled.1. Make sure that the microprocessors are installed inthe correct sequence; see “Installing an additionalmicroprocessor” on page 19.2. Check the BMC log or the system-error log todetermine the reason for the lit LED.3. Find the failing, missing, or mismatchedmicroprocessor by checking the LEDs on themicroprocessor board.4. Reseat the following components:a. Failing microprocessorb. Microprocessor board5. Replace the following components one at a time,in the order shown, restarting the server each time:a. (Trained service technician only) Failingmicroprocessorb. (Trained service technician only)Microprocessor boardVRM A dc-dc regulator has failed or ismissing. 1. Check the BMC log or the system-error log todetermine the reason for the lit LED (for a VRM).2. Find the failing or missing VRM by checking theLEDs on the microprocessor board.3. Install any missing VRMs.4. Reseat the following components:a. Failing VRMb. Microprocessor associated with the VRMc. Microprocessor board5. Replace the following components one at a time,in the order shown, restarting the server each time:a. Failing VRMb. (Trained service technician only)Microprocessor associated with the VRMc. (Trained service technician only)Microprocessor boardChapter 6. Solving problems 63