You could check resistance, in each direction, between the three legs and report here. That might shed some light.

 

You could check resistance, in each direction, between the three legs and report here. That might shed some light.

Hi guys,
I made a video please check if you can check. I hope i did it correct, still learning how to use a multimeter.

Oh and thank you Albert, and Bertus, your help is much appriciatedThank you.

It looks like a new Mosfet?Just a really stupid question perhaps, that working mosfet, what is it doing? Nothing? If so could i swap them?

 

Ideally you need to take the fet out of the pcb to test it, if its shorted both ways between D and S terminals, one test you can do with the iron plugged in is measure the voltage across the Ntc terminals while the iron is heating up, it should be decreasing.

 

Ideally you need to take the fet out of the pcb to test it, if its shorted both ways between D and S terminals, one test you can do with the iron plugged in is measure the voltage across the Ntc terminals while the iron is heating up, it should be decreasing.

Thanks for explaining let me try

 

Hi guys,
I made a video please check if you can check. I hope i did it correct, still learning how to use a multimeter.

Oh and thank you Albert, and Bertus, your help is much appriciatedThank you.

It looks like a new Mosfet?Just a really stupid question perhaps, that working mosfet, what is it doing? Nothing? If so could i swap them?

I suspect that the one which gives low readings in all directions is faulty (the one which gives no beeps may be OK).
You need to remove the beeping one and check it again.

 

the mosfet on the controller board is shorted it is a small 8 pin mosfet, gate signal is from the PID, to pin 4, the two mosfets on the power supply board is ok since it only serves as a 24volt supply via red and black cable, test the 8 pin mosfet for continuity it should not be shorted.

 

Yes, most likely the MOSFET. It's possible for a wiring error in the iron to cause that kind of problem, but if it worked before that is unlikely. I guess there could be a loose wire or bad connection with the tip.