Jim Lewis
 lvl.1
Flight distance : 3166 ft
United States
Offline
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I had the same problem. Smart Controller would not turn on (I just had it on a few hours earlier). I plugged it in with its official charging cable and AC adapter. Held the Power button down for ~30 seconds and it turned on. The battery had ~43% charge (~same as it had when I turned it off a few hours earlier).
What I had been doing previous was charging the Smart Controller using a Li-ion battery pack and using the official USB cable for the Controller to connect to the 5V/2A output of the battery pack with the Controller OFF. According to DJI Tony's post in another thread, this is fine: https://forum.dji.com/forum.php? ... =180443&pid=1752630. The controller had been charging VERY slowly at 5V and only about 0.4 A and appeared to shut down normally. The reason that I was doing this is that I wanted to fully cycle the 25000 mAh battery pack to "initialize" it (it's brand new) and since the Smart Controller has a 5,000 mAh battery, that was a good way to help fully discharge the battery pack before charging it to 100% again to hopefully maximize its capacity.
I haven't read all the posts in this thread yet. My main problem now is I have to do the "Hold down Power button 30 seconds" each and every time I want to get the Smart Controller to turn on and once on, all the Battery LED's are flashing all the time. Perhaps it's time to reset the Controller. At this point, I'd have to disagree with DJI Tony's post, which I referenced just above in another thread, that it's OK to charge the Smart Controller with 5V/2A output instead of the 12V output from the official power adapter and cord.
Edit_Update: Actually, maybe the 2nd time's the charm. After powering it up again with the 30-sec Power button hold, letting it charge for a while, and shutting it down, it now appears to power up with the usual Press-Release-Press and Hold ... Fingers crossed it's righted itself.
Further Note: On using the Li-ion battery pack, the 5V/1A port seems to work better than the 5V/2A port for charging the Controller. With the 1A port, the input current measured with a digital USB multimeter that seems to be pretty accurate shows 1.13 A output delivered to the Controller vs. ~0.4 A via the 5V/2A port!???
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