Article ID : 00014150 / Last Modified : 11/06/2018

A high frequency noise is heard when using battery power.

    IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.

    Follow this procedure to resolve the issue.

    1. Download and install the BIOS Update Utility (AIBSYS-00235840-1040.EXE) update.

      NOTE: This BIOS update will allow the CPU C3/C6 function within the BIOS menu to be enabled or disabled.

    2. Restart the computer.
    3. At the initial SONY screen, press the F2 key to enter the BIOS setup utility.
    4. In the BIOS setup utility window, press the ARROW keys to navigate to the Advanced tab.
    5. On the Advanced tab, press the ARROW keys to navigate to CPU C3/C6 Support, and then press the Enter key.
    6. Press the ARROW keys to highlight Disabled, and then press the Enter key.
    7. Press the F10 key to exit the BIOS setup utility.
    8. In the Setup Confirmation dialog box, press the Enter key to save the changes and exit.

    NOTE: Disabling the CPU C3/C6 function may cause the battery to have shorter battery life.