ST16 not booting

xptek · Jul 12, 2018

Its my first post so please dont shout if anyone has had the same problem, I've looked and cant find any answer.

I've had the typhoon since it came out, cant say I've flown more than 3 hours though.
Anyway I plugged the st16 into charge last night and when it was all green I removed the usb lead and left it till i came home from work since i was planning a flight tonight.

I went to switch it on and nothing, no fans no light nothing, so i plugged the charger back in and after a few seconds the fans came on then went off again, no screen nothing, then it seemed to into a mini loop it would start to boot then said entering DOX mode enter reboot command and switched off again.
it is now just doing nothing, it sometimes starts the fans then it goes off again and repeats.

I gather its just a brick now, I havent done any firmware updates or anything with it.
Has anyone else experienced this?
Thanks in advance for any info

rdonson · Jul 12, 2018

Do you have another ST16 battery to try???

xptek · Jul 12, 2018

No I've just ordered a replacement so when it arrives tomorrow I'll give it a try

Murray Martz · Jul 13, 2018

Also, try using a phone charger instead of the Yuneec one. Another thing that may work, is using your laptop or PC to charger the ST16. The battery may have for some reason gone lower in voltage than it should be, causing it not to charge. The laptop/PC USB port may trickle it back to a working battery.

Steve Carr · Jul 13, 2018

Right. Check the battery with a voltmeter. It should be 4.2 volts at full charge.

If the battery is good there is a method to attempt to un-brick it. But before doing so you really need to know if the battery is the cause.

hueman · Feb 25, 2019

Help! Same problem... well... similar...

Ran the ST16 battery fairly low (stupidly perhaps - 8/9%) but promptly turned off and plugged in to recharge.
Charging symbol (battery) wasn't showing, no response on tapping screen either.

Then it turns itself on, shows yuneec logo, fans on then all off again, and repeats until i unplug it.
Then I got the system recovery screen shown in the photos below a couple times but there are no volume up/down or power buttons which is what it says to use to either scroll or select the options given which are: Reboot (Hilighted) / Update / wipe... / wipe...

So now I've shut it down, taken the battery out in hope that it might just reset itself and recover.
I'm afraid of trying anything else at this time, I've not long had it back from warranty repair as the wifi board was shot last time.

Anyway, @Steve Carr (or anyone else out there) you mention theres a method to resolve this, any info on this please?

Cheers!

Mrgs1 · Feb 25, 2019

I'm sure I read a while back some ST16s would run the battery down and the only solution was to be sent back to yuneec, and some people had to have new controllers.

RPR · Feb 26, 2019

Leave it charging as mentioned, don’t panic. Even if your RC goes into a brick mode after deep hibernation, the ST16 or ST16s is pretty easy to recover.

Steve Carr · Feb 26, 2019

hueman said:
So now I've shut it down, taken the battery out in hope that it might just reset itself and recover.

The best solution is to charge the battery with a hobby type battery charger that has a setting for charging a 3.7v lithium battery. The connector on the battery is an EC2. I'm guessing the battery is somewhere around 3.2 volts and it won't charge properly in the ST16 until you can get the battery voltage closer to 3.7.
Do you have a hobby store nearby or any friends who have RC cars? They will likely know how to charge this battery.

Mrgs1 · Feb 26, 2019

Mrgs1 said:
I'm sure I read a while back some ST16s would run the battery down and the only solution was to be sent back to yuneec, and some people had to have new controllers.

ST16 battery discharges when turned off

I went out the other day and the battery was discharged. It was 75% when last used. I disconnected the battery, reconnected and then it acted like it wouldn't charge. In reality the battery so discharged it took many hours to get back to fully charged state. Thursday it did the same thing...

yuneecpilots.com

hueman · Feb 26, 2019

Steve Carr said:
The best solution is to charge the battery with a hobby type battery charger that has a setting for charging a 3.7v lithium battery. The connector on the battery is an EC2. I'm guessing the battery is somewhere around 3.2 volts and it won't charge properly in the ST16 until you can get the battery voltage closer to 3.7.
Do you have a hobby store nearby or any friends who have RC cars? They will likely know how to charge this battery.

I have an RC charger but it doesn't have this output or connectors.

Anyway, I left it overnight and plugged in to charge this morning.

Hallelujah, it's charging now, albeit slow as heck! But, it's now in the yellow and fingers crossed it'll charge up fully.

I'm assuming these batteries are made up of 3 or 4 - 18650 batteries (the type e-cigs use) - i have reconditiond these seperately, even 'jump started' dead ones so they could accept charge again.

However, since i currently only have the 1 st16 battery i didn't want to risk anything and today is awesome weather (finally) so I am keen to get out flying.

I'll be ordering another 1 to have as spare or 2 if this ones shot.

I'll post results here when done. Thanks all.

EDIT: Now it's in the white!