How to fix Hubsan X4 transmiter

My Hubsan X4 (H107) had developed a problem synchronizing with transmitter (tx to rx). Since I had to disassemble it completely and solder broken battery cable I wasn’t optimistic that I could fix it. But I knew the quadcopter was flying after my repairs, so I kept thinking that the problem may lay somewhere else.

I suspected the transmitter. Symptoms below were appearing in random order:
* Hubsan X4 established link to transmitter (LEDs on), but does not react to throttle
* Link is established, but drops immediately – LEDs flashing on quad-copter or LED flashing on transmitter
* Red LED flashing quickly on the transmitter

I tried all the usual IT magic: turn it off and on again, shake, press all buttons in random order and combinations etc. with no result. I tried to do the factory reset and recalibration – the transmitter did not respond to that. I needed to think outside of the box. And then it hit me!

The solution was (drumroll…) to change the batteries in transmitter.

The Hubsan X4 transmitter has a battery status build in, but it seems to be broken – it was showing more the batteries still have 3/5 of the juice while the batteries were clearly dead.

Facepalm

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7 Replies to “How to fix Hubsan X4 transmiter”

  1. I’ve taken apart my hubsan 3 times and resoldered my power chords 3 times before reading this. My batteries also said the were mostly charged but was the reason for me disconnecting.. Thank you and your hat picture is exactly how I feel. I thought I could trust the onscreen monitor. Guess that’s what I get for paying 40 dollars for an awesome toy. Thank you

  2. OMG thank you x10000000 i was about to go crazy trying to figure this out. YOU DA MAN for posting this solution. Obviously the battery indicator on the controller is sh!t

  3. OMG, I had just got my quad stuck so high in the tree. I had to use the hose to get it down, but then the throtle didn’t work anymore. I thought it was stuffed. I had very little faith this was the issue but it worked !!! Thank you so much !!!

  4. This comment made my day. I struggled several days with binding to the copter. The radio control displayed all the info but did not enter binding or calibration modes. This entire time battery showed 3 out of 5. I reassembled the drone, reassembled the radio control, in the process, had to resolder a tiny LED light wire with a huge 100W soldering iron and burned my sofa because of forgetting to turn it off. And the issue was in FRICKING BATTERIES!!

    Huge thanks from Ukraine, bro. This should be #1 link in google for searching problems with binding.

  5. I also would like to thank you for this wonderful information. I had only used mine for a few hours then put it up for a few days and then could not get the drone to fire up. I put all fresh batteries in it and it is fine now. Thank you for this…. Karen

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