Khadas VIM3 - 12V went into SPDIF

Hi all.

My mate asked me to help fixing his VIM3 that was used in his car.
Accidentally he sent 12V on SPDIF.

I’am really good at soldering anything, but would appreciate your experienced help with hints on what to check on the board.

From what I can see now - 0.8V, 0.9V, 1.1V on RAM, 3V3 and 5V are all present. USB voltage is also present.

Can’t see any obvious shorts on any caps or heat spots with an infrared cam.

If I press F button 3 times at boot - blue LED flashes with either 1-2-2, 2-2-2 or 2-2-1 patterns.

Any help is greatly appreciated.

would really appreciate a comment from someone on the engineering team - what does pin 13 connect to? Is it going straight to the CPU? Which parts should I check if 12V were pushed into pin 13?

@in-sympathy If a complete current loop was not created, then there is a chance nothing may have happened.

The SPDIF pin is connected directly to the SoC. Does your board boot normally, and is anything displayed when only a screen is connected ?

Hi, thanks for getting back to me on this.

Absolutely nothing is being displayed, however:

  1. From what I can see now - 0.8V, 0.9V, 1.1V on RAM, 3V3 and 5V are all present. USB voltage is also present.

  2. If I press F button 3 times at boot - blue LED flashes with either 1-2-2, 2-2-2 or 2-2-1 patterns.

Can you try to burn new firmware to the board ?
https://docs.khadas.com/products/sbc/vim3/install-os/install-os-into-emmc-via-usb-tool

https://dl.khadas.com/products/vim3/firmware/android/vim3-android-9-64bit-v241023.img.xz

please check my above messages regarding this

When putting the device in burn mode it should be recognised on your PC, if not you may have possibly damaged the the SoC on the device, and may need after sales support.

Well since it doesn’t get recognized and white LED is not on - I guess SoC is indeed damaged. Thanks, maybe I’ll try to get a new SoC and replace it