Knowledge Article: ID B0A07AC02: 1.8V standby under recommended voltage

Description

The voltage of the standby power module in the blade expansion module has reached or fallen below the recommended voltage threshold.

Causes

There could be a variety of causes that could influence the voltage to exceed a high threshold or fell below a low threshold:

• obstructed airflow
• bad component such as IO card, voltage regulator module, Blade expansion unit, etc.
• bad power supply
• AC outlet not supplying the correct voltage and current

Implications

The Voltage event occurs when the state of a system voltage sensor changes with respect to a manufacturer-defined threshold. The cause of the voltage problem should be identified and addressed at the earliest opportunity.

Resolutions

1. Check the event log for other under voltage events. If the under voltage problem is occurring on all blade servers, look for other events in the log related to power and resolve those events.
   Note: If the under voltage problem is occurring on all 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 is resolved.
2. Reseat the blade server, the blade I/O expansion module (if installed), and the blade expansion module.

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 download the latest firmware or drivers, visit the "Fix Central" Web site, select "BladeCenter" for "Product Group" (from the pull-down lists), select your product for "Product" (from the pull-down lists), select your product machine type for "Product" (from the pull-down lists), and select your operating system for "Operating system" (from the pull-down lists). You can refine the search by selecting the category of the download of your interest from the "Refine results" list.

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.