Knowledge Article: ID B04428000: Voltage regulator fault.

Description

A fault occurs on the CPU voltage regulator on a blade server.

Causes

A variety of causes could influence the voltage to exceed a high threshold or to fall below a low threshold:

• Obstructed airflow
• Bad component, such as an IO card, a voltage regulator module, a blade expansion unit, or other component
• Bad power supply
• AC outlet not supplying the correct voltage and current

Implications

Address the CPU voltage regulator at your earliest opportunity. If the CPU voltage regulator continues to fault, the system might shut down.

Resolutions

If the call home to IBM was successful, you can expect a service call from IBM. In the meantime, perform these steps:

1. If the voltage problem is occurring on multiple blade servers, look for other events in the event log related to power and resolve those events.

   Note: If voltage problems are occurring on multiple blade servers in the same power domain, the problem might be in one of the power modules that power that domain. Log in to the advanced management module to see the power modules that are associated with each power domain. Replace the power modules, one at a time, to see if the problem resolves.

2. Check the change history for blade server service processor firmware and BIOS for any issues related to this problem. If so, update the blade server firmware and BIOS.
3. (Trained service personnel only) Replace the system board.

Additional information

To find additional troubleshooting help, visit the "IBM Support & downloads" Web site, select "BladeCenter" for "Browse products for support" panel. At "Support & downloads quick start" page, select your product for "Choose your products", and "Troubleshooting" for "Choose your page", then select "View your page" for "See your results". To narrow the results, search with keywords that are related to this article, such as "fail", "Chassis", etc. in the "Search support" field at the right panel.

To find the replacement part number (or the FRU number) for the component replacement, visit the "BladeCenter and System x Product Information - Servers" Web site, select your product from "IBM BladeCenter products" table. Then select "System service parts listing" for your product.