Solved mine!
I had this problem too! Gimbal starts up normal as usual, green breathing light and all. But :
- Can't control the GoPro at all from the mobile phone,
- Can't control the GoPro (start stop record) from the remote
- Can't rotate the GoPro (gimbal) up or down.
= Together means, Gibal (and attached GoPro) are taking zero external commands while internal commands (stabilizing) works fine.
= Also the Gimbal can't talk back as the remote correctly states "no gimbal found".
I switched to a 2nd gimbal, and still same symptoms, so that means it is a problem in the drone somewhere...
Starting from the connectors I worked my way up, expecting a lose wire at the pcb or something.
Turned out it was not a lose wire, but really really bad soldering!
The place where the gimbal data wires meet the solo-main pcb had a soldering bridge between 2 wires (luckily 1 data and 1 gnd, so no real harm done most likely).
Here some footages :
This is interesting* as the older Solo has much nicer (not great, but ok) soldering. See here my older Solo :
On my new Solo you can clearly see the soldering bridge error made by using to much solder, and/or not enough heat, and/or not enough flux. This can be fixed pretty easy by using a soldering iron and some flux or solder removal tools. Afterwards my gimbal is 100% functional!
May it help many more people =^.^=
*PS. Kinda interesting as I started speculating why the quality was so different, got lots of idea's including assembly dates after 3DR gave up on Solo X3.