Phantom 3 Standard - no video feed - WM321 video encoder board issue?

Cuboides commented 3 months ago

Hi all,

I just recently bought a second hand P3 standard and have the following issues:

firmware update required cannot be performed as says no SD found
camera controls in the app (DJI go) are grayed.
the app does not show any video feed.

Note

the drone can fly fine.
no issues with connecting remote or wifi
SD SanDisk extreme 32GB properly formatted FAT32
the gimbal seems fine, does the dance at startup and goes up and down with the remote scroll
I removed the encoder board and tested the volts in the various service pads, all good.I also connected the board with UART using U0TX/RX service pads. The Amberalla chip is unresponsive,

If anybody can help further as I am at a stall. Thank you

Cuboides commented 3 months ago

Hi both

Hope you are well. Would you have any suggestions for the next step?

Not sure what to do next. I started a topic as well on phantompilots but not resolved.

https://phantompilots.com/threads/p3s-how-flash-gimbal-circuit-board.154123/

@mefistotelis @danieltroger

mefistotelis commented 3 months ago

You made a new repository just to make an issue asking for help? I guess you wanted to just create an issue in https://github.com/o-gs/dji-firmware-tools project, but it went wrong?

Anyway, while I did messed with the Ambarella FW a bit, and made a tool to extract and modify it, I never had a need to manually reflash its FW.

For workshops with proper BGA soldering equipment, the simplest method is probably to take the NAND chip off the board, flash with a programmer, then solder it back. For less invasive methods, I listed them on the wiki: https://github.com/o-gs/dji-firmware-tools/wiki/Firmware-m0100#flashing

I was mostly interested in P3X/P3S and that is what the Wiki mostly describes.

If you need more details, find someone who actually did reflashed the Ambarella. It was used in many action cams, check the forums about that. DJI did modified the SDK Ambarella provided, but the general structure and boot system remains the same. There are also some repair guys on dji-rev.com, Mattermost invite is somewhere on Github.

You can use dji-firmware-tools to extract Ambarella FW, its bootloader and other partitions, from the whole DJI FW package. You have to figure out what and how you need to flash to the NAND. If you can't see any messages on UART, I guess bootloader.

Cuboides commented 3 months ago

Hi Mefistotelis,

Apologies about the wrong publication section.

Thanks for your suggestions!

Cuboides / Phantom-3-Standard---no-video-feed---WM321-camera-encoder-board-

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