# RB5 mainboard power

Source: [https://docs.qualcomm.com/doc/80-88500-5/topic/RB5-mainboard-power.html](https://docs.qualcomm.com/doc/80-88500-5/topic/RB5-mainboard-power.html)

Connect the +12-V power adapter. The board boots up with one of the following options:
      
- Using the **PWR** button
- Plugging in a USB Type-C cable
- Setting the `CBL_PWR_N` DIP switch to the ON position

      To view the bootup message logs, plug in a microUSB cable into the debug port and use a serial terminal (such as PuTTY) or wait for 5–10 seconds for the green light beside the power plug to illuminate. To reboot the device manually, hold down the **PWR** button for at least 20 seconds.
      
Note: If you plug only the USB Type-C cable, the green LED keeps flashing and the device does not boot. Ensure to connect the power adapter.

**Parent Topic:** [RB5 mainboard](https://docs.qualcomm.com/doc/80-88500-5/topic/rb5_mainboard.html)

Last Published: Nov 25, 2025

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