Introduction: Fix Your QuadCopter

Picture of Fix Your QuadCopter

One of the hot toys this Christmas was quadcopter drones. They are an awful lot of fun for a great price, and are a lot more fun to learn to fly than larger (more expensive to crash) models.

If you are having repeated problems with broken or bent props, prop guards can help.

Prop Gaurds:

Due to their inexpensive construction and very inexperienced pilots, there are bound to be some breakdowns. In this tutorial I will explain how to replace stripped screws, broken or bent propellers, repair broken LEDs, broken clasps, broken wires, and stop the battery from shorting out the gyroscope.

If your quadcopter if flying unstably, making buzzing noises, not fully lighting up, not charging, flying with a mind of its own, one propeller is not spinning, it is loosing screws, or its shell will not stay closed this is the instructable for you.

For this tutorial you will require:

- A set of small Philips screw drives (my quadcopter required a pH0)

- spare propellers (extras come with most models)

- a hot glue gun

- clear tape

- a soldering iron and fine soldering tip

To open your quadcopter, first remove the four screws on the bottom of the case, then remove the clips near each rotor.

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Step 1: Bent Propellers

Picture of Bent Propellers

It is very common to bend the propellers of your quadcopter, because they are made to be soft as not to hurt people or cause damage to other objects.

Bent propellers are characterized by loss of lift from one propeller (if concave) or a buzzing sound similar to a mosquito and reduced performance (if convex).

Place your quadcopter on a flat surface and observe the propellers at eye level. simply apply pressure to the propellers to bend them back into shape. NOTE: Less is more, repeated bending will severely weaken the propellers leading to cracks or fractures.

Step 2: Replace Broken Propellers

Picture of Replace Broken Propellers

To replace a broken or severely bent propeller simply pull vertically near the center of the propeller then press the new propeller onto the shaft of the rotor.

Make sure that you replace the propeller with the correct replacement as there are A and B propellers which rotate in different directions to increase the stability of your quadcopter.

Replacement Propellers:

NOTE: Repeated removal and replacement of the same propeller can cause the propeller to no longer friction fit and come loose during flight.

Step 3: Stop Battery Shorts

Picture of Stop Battery Shorts

The insulation between the bag battery and the circuit board of most mini quadcopters is very easily dislodged. If your quadcopter will no longer charge, has extremely short battery life, or flies sporadically and seems to control itself once turned on you may be having shoring issues.

After removing the case and the piece of insulating plastic from beneath the battery I attached the piece of insulation to clear tape, then wrapped the battery in clear tape to prevent any short circuits.

Step 4: Re-Attach Broken Wires

Picture of Re-Attach Broken Wires

If one propeller no longer spins, first turn the quadcopter on and rotate it in different directions, the propeller which is highest should slow down or stop, if the propeller spins when it is the lowest, but will not spin while level check the insulation around the battery to see if it is a shorting issue.

If the propeller will not spin at all check the wires connecting the motor to the circuit board. If one has become detached use a pair of forceps to hold the wire and use a liberal amount of heat with a fine tipped soldering iron to melt the solder and re attach the wire.

Replacement Motors:

NOTE: only add solder if necessary and make sure to use fine grade "high tech" solder as it has a lower melting temperature to avoid frying components and melting wires on compact circuit boards.

Step 5: Replacing LED's

Picture of Replacing LED's

If one of the LED's comes loose from your drone, the most important step is finding the original LED because it is smaller than a grain of rice (approximately 1mm by 1.5mm). If you cannot find the diode you can buy micro LED's for a few cents from commercial electronics stores.

Make sure to note the diode direction markings on the back of the diode and the circuit board (make sure they point the same direction when you place it on the board!)

You will notice that if you place the diode when the motor is still in place it will be pulled in by the magnetic field of the brush-less motor, so the motors must be dropped.

Next using a pair of forceps carefully place the LED back onto the contacts then melt the solder with a fine tipped soldering iron.

After the solder has cooled make sure to turn on the drone to test the LED's before putting the case back together as minor adjustments may be necessary.

Step 6: Replacing Removed Screws

Picture of Replacing Removed Screws

You hay have noticed small amounts of silicone on the tips of the screws when you removed them, hot glue is a readily available substitute. Make sure that the hot glue is VERY hot as you do not want it clumping. After reattaching the clips near each rotor, liberally dip each screw tip in hot glue before reinstalling. This will also help to precedent screws from coming dislodged during flight.

Step 7: Broken Clasps

Picture of Broken Clasps

If the clasps that hold the outer casing together break, the upper and lower shell can be held together with small elastics such as used for braces or for holding wires and headphones in their packaging.

NOTE: Make sure to counterbalance the elastic or the quadcopter may have balance issues.

Step 8: Back to the Skies

Picture of Back to the Skies

Hopefully this tutorial has helped to fix your quadcopter, if you are having issues understanding a step or have questions/suggestions feel free to comment below or message me.

Have a great day and fly safe! :-)

If you enjoyed this instructable, make sure to see how you can turn your mini quadcopter into a flying F-14 Tomcat!

PS Above is a thermal video of my quadcopter taking off.


LonwaboM (author)2017-12-12

Hi, one of the four motors doesnt work, but if I turn the quadcopter upside down it works. Before this discovery I thought of a broken wire, etc. but I dont think thats the reason. Any advise, please.

4804311532 (author)2017-11-06

My drone's power button fell out, any solutions? I need all I can get!

4804311532 (author)48043115322017-11-06

power switch* (Its not a button)

ecy0000 (author)2017-04-26

Hi, I have a MJX Bugs 3 quadcopter and one of the propeller stopped working after it fell out of the sky. I do not see any physical damage and I have tried to open it up to compare it to working propeller but I do not see any difference either. I do not know what's wrong and what to do.

Maker Saga (author)2017-02-24

Well written and handy! Here's a few more tips in case you want to add them (kinda sorta already covered):

1. Gyro recalibration for Floureon H101 and Eachine H8 Mini (maybe additional models too):

On a flat surface, move both sticks down and to the right. You're all set once the drone stops flashing.

2. Make sure you have the correct type of propeller on the correct motors. If one or more propeller blows air the wrong way, switch it out for the opposite type of propeller. Clockwise (CW) vs counterclockwise (CCW) motors and propellers.

3. Hair stuck around propellor shaft is the most common issue in our experience!

4. Dirt or sand in gears:

Use a dental braces soft pick to remove sand or dirt from gears.

5. Drone fell in puddle:

Soak drone in bowl of dry rice or silica dessicant packets. Using a fan or wind instead may cause corrosion.

6. Motors overheating:

Some 7.4v toy drones uset motors designed for lower voltages, this is incorrect and may cause the motors to overheat and eventually fry. ( for this one I don't know a solution to this, maybe the author has an idea)

Hopefully this comment is helpful in some way!

ralphjolly (author)2017-01-23

Howdy. How do you find out what motor to buy when replacing them?

I have a quadrone pro and the motors have no writing on them.

Is there a standard size?


Maker Saga (author)ralphjolly2017-02-24

The diameter of the shaft hole on a propellor is usual a standard size of some sort in my experience. You could search your drone brand and model name followed by "replacement propellors" or "spare propellors". I usually order my spare props on

Ariyaaa (author)2017-01-04

Hi one of my Clips below the propeller broke of i have the top of it than i super vlued it than my drone wasnt flying properly what do i do?

paladin66 (author)2016-12-27


can Someone help to connect
Saitek Joystick X56 + Scherrer Tx700 Pro + Rx700 LR +PSU
in order to fly a quadcopter ?

And if it is impossible
How to connect the TX700 Pro and the Quanum V52 Ground Control System, please?


shani26 (author)2016-12-19

hi there, I have a quadcopter with FPV built into the RC after a crash the quad no more fly, and i could no engage the motors, however the FPV still works.

I have ordered a new receiving board i though it could be that maybe?? help!! I need my drone back! ta.

jfudger (author)2016-01-09

hey one of my motors is not strong enough to lift the one side, and no longer can lift off the ground. do you happen to know any fix?

kylev30 (author)jfudger2016-12-13

Maybe its because of the wings and they're probably not in the right order.

Just4Fun Media (author)jfudger2016-01-09

Is the one propeller spinning slower then he rest or just producing less lift?

jfudger (author)Just4Fun Media2016-01-09

its not producing enough thrust. it was working for a few days but now whenever i try to fly it at max power, the drone launches to the side with the weaker motor.

Just4Fun Media (author)jfudger2016-01-09

Have you tried swapping the prop with the motor diagonally opposite?

If the thrust issue moves with the prop, it is likely a bent or cracked propeller. If the thrust problem persists check the connections on the motor and circuit board. Frayed wires or broken solder connections (that are only held together by friction) can cause reduced (or non existent) thrust.

Have a great day! :-)

BaganS2 (author)2016-09-28

hi, i have a problem with my cx 10, one of the motor is not working after crashed. i thought because of the broken motor, i tried to change with the new one but it still not working. i dont know what is the problem, can u please help me...

Just4Fun Media (author)BaganS22016-09-28

Did you change the motor and the wires? Or just the motor?

If you have a continuity tester I would test each wire and across the motor (to check for breaks and shorts).

The wires on the motors commonly break is crashes.

Have a great day!

BaganS2 (author)Just4Fun Media2016-09-28

I've check all the motors, they work. I think something broker with the board, but i dont know which part.

I've try to replace with brand new motor and cable, but this side of motor (cw) never working even it's new motor.

Just4Fun Media (author)BaganS22016-12-09

It sound slike you may have burnt out a motor controller on the main board.

You can always buy a new mini quadcopter and keep this one for spare parts, or buy a new control board.

All the best,


SeanA68 (author)2016-10-03

Just installed micro warehouse motors in my JXD392 and now it randomly cuts off on full batteries, do you have to use bigger batteries when u upgrade motors? Need help please, thx in advance!!!

Just4Fun Media (author)SeanA682016-12-09

You should check the power draw of your motors.

I upgraded my quadcopter to more efficient motors (same electrical draw fro more rotational power).

If you selected motors which draw more power, you may be pulling more current than the control board can supply. You can either upgrade your control board or upgrade to more efficient motors.

All the best,


VeronikaB7 (author)2016-04-01

how do i fix a circict board two legs broke off

Did the circuit board fully break or did the contacts (leads) just separate from the board?

Dustin Rogers (author)2016-04-14

I just got a CX-10C the other day. It's my first quad and I've been having a blast with it. One modification I made that has helped tremendously is to color/paint the front half of the housing (top and bottom) black to help me with orientation. I just used a Sharpie. Despite it's super light weight, I do the majority of my flying outdoors and the tiny LED's aren't visible in daylight. The contrast of black/white makes orientation really easy to determine, even with the quad 15' in the air.

DakLak (author)2016-02-07

BENT PROPS, if commercially moulded - not 3D - can sometimes be returned to their original profile by very, very, gently heating them in an oven - whilst you monitor their resurrection through the viewing window.

Leave them alone and they might melt!

Leathaldose (author)2016-01-24

to bad there is no such thing as terrible drone pilot fixing.

Hambone22 (author)2016-01-10

What quadcopter is that

jtackkett (author)Hambone222016-01-11

I found one of these at MicroCenter.

Just4Fun Media (author)Hambone222016-01-10

It is a Cheerson CX model quadcopter,

It is comparable to a "Pocket Drone" or RAGE nano drone.

Have a great day! :-)

jtackkett (author)2016-01-11

Thanks. I got one of these at MicroCenter and after just a few hours of flying, I broke one of the propellers by constantly smashing into the ceiling. I couldn't figure out how I was supposed to remove the prop and replace it with one of the extras. Thanks for the 'ible.

About This Instructable



Bio: I am an inventive photographer, Pilot, and MacGyver. I love building and modifying things to aid in my adventures. Check out my Website! Have a ... More »
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