I checked the ECS just by my eyes, and I'm not sure there are any solder pieces/scrap falling on it. So I bought another ECS (spent a couple of days to get it)and checked with smoke stopper, and it showed green and it sounds great.
After welding XT60 and the motor and capacitor, still showed green.
Connected with FC, still showed green.


Finally, I connected with DJI FPV air unit and pressed the smoke stopper button, it still showed green at first, but a few seconds later, it showed red.....


Should I buy another DJI FPV air unit?

Nope you are good. Smokestopper have a max amp draw limit and if you go over that it trips. In this case when you have your dji uint connected together with the esc, it trips.
The Vifly smokestoppers have an extra button to increase the amp draw limit. If you push that before pushing the on button it will likely stay alive .

(08-Sep-2023, 03:22 PM)fpvapnea Wrote: Nope you are good. Smokestopper have a max amp draw limit and if you go over that it trips. In this case when you have your dji uint connected together with the esc, it trips.
The Vifly smokestoppers have an extra button to increase the amp draw limit. If you push that before pushing the on button it will likely stay alive .

OH MY GOD!! YOU ARE RIGHT!!!!!!
Thanks you!!!
I can go to sleep so well~
good night~~

Thanks for your response, when I connected to Betaflight, it showed "no valid receiver signal is detected".

Long time ago I burned my quad and left it for a long time.
I wanted to fix my quad. motor FC ESC all broken.
So I bought new motor FC ESC and capacitor.

I'm sure remote controller connected air unit, because both showed green, camera is fine as well. I  also can play Liftoff with my remote controller.

Should I buy a new DJI FPV air unit(without camera)?
and when I watch DJI FPV goggles, there is a quad icon on the bottom-left corner, Does that mean signal or battery? and why is undulate?
I changed another battery but still undulate.
and when plugging the battery, a few seconds later it will show lower battery on the bottom-right.

need help~

oops, I'm stupid, after setting port and setting ARM mode, I can unlock motor with remote controller.
I think because of connecting Betaflight, the goggles show low-power mode.
I disconnected Betaflight and it worked fine.