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Solved ESC problems

#1
Hi I just bought the tiny trainer and all the electronics after a couple flights I started having problems with the motor. The motor would just go back and forth after some research I discovered it month be the mofets I opened up my esc and saw that this one connector was soldered wierd is this supposed to be like thisl
1ED8399C-180A-465B-AA9C-23F9B9BCE0CC.jpeg
 
#6
well if you have any experience with soldering i would have a go but otherwise just opt for a new one, its probably damaged if you have tried to use it already and they are only about $9
 

DamoRC

Well-known member
Mentor
#7
So I would check a couple of other things first.

Although the soldering job on the ESC is horrible, its not necessarily wrong. These mosfet chips tend to have one side as a common drain. On the other side, three of the pins are common source and one pin is gate. From a little googling, it looks like the pins that are bridged are the common drain, so they are all connected internally in the chip and there is no problem with the pins being bridged with solder.

Things to check are the bullet connectors (both on the motor side and the ESC side). These can break but the heat shrink hides the break so, holding the wire, give the bullet connector a nice tug.
 
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DamoRC

Well-known member
Mentor
#9
It could be a bad ESC as you have suggested.
I agree with @DamoRC, it could also be a bad solder joint on one of the bullet connectors. Give them a tug to see if they will pull of the wires.
Yep - no denying it could be the ESC is shot, but its likely not because of that solder joint on the MOSFET.

Here is a pic of a now defunct 25A ESC I have. The nine chips in a 3 x 3 array on the left are the P-FETs - note how the drains (top pins on rows 1 and 2, bottom pins on row 3) are all tied together with a trace or solder. Also the source pins on the other side of the chip are also tied using a pretty thick solid wire. The only pins that are isolated are the gate pins. Same goes for the array of N-FETs on the right hand side, drains are tied, sources are tied, gate is separate.

DSC_0204.JPG
 
#10
ok, thanks, ill check all the joints I resoldered the battery connector but it still doesn't work I'll check with my local hobby store and see if they have the part. I suck at soldering so ill probably just destroy it more if i try
 

FDS

Well-known member
#11
Did you check the connections to the MOTOR? One of those could be a dry joint and that would stop the motor working.
 

Mikes

New member
#16
Once my motor was doing the jittery thing and I was real disappointed because I thought had blown an ESC but it ended up being that I had too long of motor screws and one was touching the copper windings in the motor.