Question about SYMA Toys industrial New Syma S107 Radio Remote Control Helicopter

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My s107 bottom blades wont rotate top ones fine

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There are two versions of the Syma S107. The original and BEST version is the one that has the rectangle slot on the throttle, with a ball on the right joystick. The 'cheaply made for Christmas 2010' models have an inferior build quality. Most of them have wobble problems, mainly caused by an off-centre flybar.

If you have a transmitter with a ball on the left AND the right of the joystick bases, then you have a cheap and nasty model. Also, the cheap 'CMFC2010' model has a round charging socket instead of the correct Syma square. The plug on the cheap one is also a round coaxial plug/socket affair.

I have had (and returned) four of the later Christmas models now as they all had different faults. However, I exchanged one for a 'real McCoy original' Syma and after four charges, it took off on its own (no signal from transmitter as it wasn't on) and went berserk. Then it just lost all motor functions, like a drunk student.

It goes back to ModelZone tomorrow for a refund as I still have the S031. My next little heli will be a Blade MSR.

Posted on Feb 12, 2011

  • MeAndMyBrain Feb 12, 2011

    There is a good chance that the power output transistor has blown. There are three, one for each motor. They are also controlled by the microprocessor so even that could be defunct. The only way to tell is to put a resistance test meter on the terminals of the motor (where the wire goes to the PCB). You will need to unsolder one of the wire connectors from the board though, otherwise you will get a reading through the circuit board, fooling you into thinking that the motor is fine.

    If your S107 is old, then it may pay to just buy another one (but read above!) and use the broken one for hardware spares (blades, prop, boom etc).


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Dear Bmjjhh,

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