Having the same issue.
Batteries are fully charged - green lights on all four batteries
Batteries are installed in proper position - polarity correctly following diagram.
Gimble will not power up when pressing and holding the power button.
GImble will not power up when pressing and holding joy stick and power button simultaneously.
Gimble will not power up when plugged into AC via USB-C cable
We last used the gimble on 5/15 (approximately 10 weeks ago) without issue.
Please advise as to how to repair
Just went through the same issue with them a few months ago. If you're in the states, their solution will be to offer you 30% off a new one. Their claim was that it wasn't cost-effective to ship it to China since no one in the US repairs them. Ours had been out of warranty for about 90 days when it bricked.
All four batteries were red prior to charging
From the time you last used it until now, were the batteries stored in the gimbal?
I have had my own battery issues with the gimbal but never to where my gimbal wouldn't turn on.
The batteries were stored in the carry case - not in the gimbal.
Is someone from the Moza support team able to offer any insight here?
We connected a 12-volt power supply to the DC input next to the USB-c port on the gimbal. We did not have a 14-volt power supply.
The external 12-volt DC power was enough to power the gimbal into Boot Mode only - it did not fully power-on. We then took a closer look at the batteries.
As I mentioned earlier, all the batteries charged fully in the charger, turning the indicator from red to green as each finished charging. Nothing unusual here.
We loaded the charged batteries back into the charger a second time. This time we noticed only 3 of the 4 indicator lights came on as green when the batteries were loaded into the charger.
One battery flashed red for a second in the charger before turning the indicator green.
We then purchased a new set of Moza batteries from B&H photo. Charged the batteries over several hours until the red indicator lights on the charger turned green.
We installed the new batteries, pressed and held the power button and the gimbal turned on as usual.
Again, the original batteries gave no obvious sign of failure.
- hope this helps others.