Re: Transistor ID

Best not to jumper out anything to do with battery supply or charging. You don'y indicate whether battery charge is present or maintained.

Replace bad parts first.

Check charging status first.

RL

El 30/01/2024 a las 21:45, Mike H escribió:

If you short the gate to the drain the MOSFET becomes a current source and will burn in a while. The problem is in whatever part drives the gate (the left prong).

Since when can you just replace an N-channel MOSFet with an NPN transistor? Especially since the OP has 'rudimentary knowledge' and no schematics.

Arie

The transistor may be defective, or just lacking a signal on the gate to turn it on. Mosfets tend to be high resistance between all pins when tested in pairs. It would not be a good idea to permenently bypass it as it could cause damage to the motor, or battery if it has one. I suggest remove your short circuit and see if a voltage appears between the source and gate pins (see the datasheet others have drawn your attention to) when the vacuum is switched on. If not, maybe the mosfet isn't the primary problem. FWIW, they usually fail short circuit when the do fail, but then rusting is an unusual failure mode.

Remove the jumper you added. Clean the circuit board with isopropyl alcohol and a tooth brush, scrubbing gently. Make sure it's dry before testing. The rust you see may be rust, but it might also be crud. The alcohol scrub will remove crud if it's there - but not rust. But in any event, electronics that you are trying to repair after it was left out in the rain should always be cleaned of any crud on the circuit board.

Once the cleaning is done, if the problem is still there, you can proceed with some of the steps others have mentioned.

Ed