Electrical help needed

[ganesh]

Hello chaps,

I plugged in my cordless drill battery charger this morning and was met with a slight popping sound followed by no action, I swapped the fuse in the plug for a new one and exactly the same happened. So I opened it up and found the following:

If you look in the centre you can see a couple of burnt out resistors.

Corresponding burn marks on opposite side.

Heat marks on inner plastic casing.

Would these be the cause? If so I'm guessing it would be a relatively easy fix for someone with some soldering skills? I.e. Not me.

Thanks all.

 

[bitslice]

The failure rate for resistors is almost zero.

That big MOSFET in the middle is probably blown, taking the resistors with it.
It's repairable if you can get the parts and you know how to fault find or a spare board is on eBay.
But I'm not sure I'd bother for a drill.


If I knew the model and the normal output then I'd probably gut the insides and bodge in another battery charger circuit. They are all much the same and cost pennies.

You can see how cheaply made these things are, solder blobs and flux residue everywhere.

 

[Unicorn]

The failure rate for resistors is almost zero.

That big MOSFET in the middle is probably blown, taking the resistors with it.
It's repairable if you can get the parts and you know how to fault find or a spare board is on eBay.
But I'm not sure I'd bother for a drill.


If I knew the model and the normal output then I'd probably gut the insides and bodge in another battery charger circuit. They are all much the same and cost pennies.

Id also imagine its the MOSFET iv not seen a resistor fail and cause too much damage before, Usually caps are the ones to cause bit of a pop and make a burn or two

 

[Caged]

Drill chargers are dirt cheap compared to the actual drill or the batteries. I'd just buy a new one. No point trying to fix it and destroying a battery.

 

[ganesh]

Thanks for the advice chaps, looks like a new one is £26 so i'll just go for one of those.