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One of my propellers won't stop running.

Hi guys, I am new to this but I am desperate for help..

I have a UDI 818S drone which I have been enjoying right up to today. I had a bit of a rough landing and now one of the props will not stop spinning. All the other three operate perfectly well but the fourth spins at full speed as long as the battery is plugged in, even when the drone is switched off. I have searched around on the internet but can't find anyone with a similar problem, I'm sure it's a switch issue but I would appreciate some help with a diagnosis..

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Chris, I don't know where you can get the board, but I see that Pfaff below has steered you to some resources for that.

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I had the same problem after the quad hit a wall. I decided to unscrew the bottom before throwing away the quad. I found a broken wire. I resoldered it and the quad work's fine.

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Chris, here is the problem with that propeller always running. The motor is driven by what is called a pulse width modulated circuit which simply switches the power on and off, varying the on-time to control speed. The switching drivers are configured in a circuit called an H-bridge. These are basically just transistors of a certain type that switch fast and consume little power on their own, which are arranged to direct the current in the correct amount and direction for each motor.

Here is the bad news. The only way a motor connected to this type of H-bridge can run without being driven by it's intended circuit, is if the transistors are shorted. They could possibly short out if the motor was stalled for a time and the power was still being switched to the motor through the H-bridge. The motor in this case would draw more current than the transistors in the bridge could handle.

The switching absolutely has to occur normally for the motor to possibly run under control. Your drone has a circuit board which contains the four drivers to the four motors. You will have to replace that board because you can't just fix one of the drivers even though the other three work fine. Those big fat wires from each motor lead directly to the driver board making it easy to identify.

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Thanks for the speedy response, so to be clear, I need a new circuit board? Do you know if this is readily available and at what cost? I'm a complete newbie.

Many thanks.

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@tucks , Chris , Just to add to Damian's good answer, replace the PC board, link #1 below shows a dismantled copter showing the PC board and connectors,etc., and the other links show where the board may be purchased from, You can also do a google search to hopefully get better pricing. You may need the actual part # off the board assy. to be sure you are getting the correct part. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=BUghqOSF...

https://www.aliexpress.com/store/product...

http://www.rc-helicopter-spare-parts-onl...

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Thanks a lot guys, I will give these a try at the weekend and report back

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Personally I would work over the board with a soldering iron looking for a cold solder joint. But I'm cheap. Here's how to do that:

https://www.youtube.com/watch?v=5dG0fwE7...

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Just charged my battery and tried to hook it up but the propellers were going fast even with the power switch off is the switch bad or is the board the culprit? Todd from Va.

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I would look at Damians answer above.

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I had the same issue, my drone props keep spinning, it happend after crash, actualy drop from trees and i catch the drone safely, but after that.. The propeller keep spining even swith off.

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I have a E58 Eachine onboxed and this problem is the same, i called dealer but he does not accept, says i must have crashed it...

I think i will have to change the mainboard, or does anybody have a clue?

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Chris Tucker estará eternamente agradecido.
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