Motherboard Tray Battery Replacement#

Caution

Static Sensitive Devices: Be sure to observe best practices for electrostatic discharge (ESD) protection. Ensure that personnel and equipment are connected to a common ground, such as wearing a wrist strap connected to the chassis ground and placing components on static-free work surfaces.

Motherboard Tray Battery Replacement Overview#

This is a high-level overview of the procedure to replace the motherboard tray battery of the NVIDIA DGX™ B300 system.

  1. Confirm the battery is not functional.

  2. Purchase a CR2032 battery.

  3. Power off the system.

  4. Label all motherboard cables and unplug them.

  5. Slide out the motherboard tray.

  6. Remove the lid.

  7. Remove the motherboard air baffle.

  8. Remove the motherboard stiffener.

  9. Replace the battery.

  10. Install the motherboard stiffener.

  11. Install the motherboard air baffle.

  12. Install the motherboard lid.

  13. Slide the motherboard tray into the system.

  14. Connect all the cables.

  15. Power on the system and update the date in the BIOS and the BMC.

Identify a Failed Battery#

When the battery fails, some of these symptoms might occur:

  • Invalid configuration will appear on your screen.

  • Setup appears on your screen before booting.

  • Press F1 to continue appears on the console.

  • A Clock Error or Clock message appears on your screen.

  • The system clock loses time and date.

Contact NVIDIA Enterprise Support to confirm that the battery is the right component to replace.

NVIDIA does not provide the CR2032 battery, which can be found at a convenience store. After you purchase a battery, perform the following procedures.

Prepare the System for Replacement#

Caution

Wear an ESD strap during any procedure that involves touching electronic components.

  1. Power off the system.

  2. Pull the motherboard from the chassis and remove the lid and the air baffle.

    For more information, refer to Motherboard Tray - Removal and Installation.

Remove the Motherboard Brace#

  1. Unlock the motherboard brace by turning the locking pins 90˚.

    _images/dgx-b300-mb-brace-unlock.png

  2. Lift the brace off the motherboard.

    _images/dgx-b300-mb-brace-lift.png

Replace the Battery#

  1. Release the old battery by unlatching it from the holder.

  2. Replace it with the new battery, ensuring the positive side faces to the right. Make sure the new battery locks into place.

    _images/dgx-b300-replace-battery.png

Install the Motherboard Brace#

  1. Position the motherboard brace in its slot.

    _images/dgx-b300-mb-brace-insert.png

  2. Secure the brace by turning the pins on either side 90° until they lock, as shown below:

    _images/dgx-b300-mb-brace-secure.png

Power On the System and Confirm the Replacement#

  1. Install the air baffle and the lid.

    Refer to Motherboard Tray - Removal and Installation for more information.

  2. Return the motherboard to its regular position.

  3. Connect all the cables and power cords to the motherboard tray.

  4. Power on the system.

  5. To restore the date on the system, manually set the date using NTP:

    sudo date [MMDDhhmm[[CC]YY][.ss]]

  6. Set the system’s date and time to match the hardware real-time clock:

    sudo hwclock -w

  7. Reset the BMC:

    sudo ipmitool mc reset cold

  8. Log in and run nvsm show health:

    sudo nvsm show health

  9. Confirm that the time and date on the system are updated.