Fixed my drill

Discussion in 'The DIY corner' started by frakncylons, Apr 1, 2020.

  1. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    Fried the MOSFET doing stuff I shouldn't have been doing. Works like a champ again.

    IMG_20200401_175851994.jpg
     
    Nebowictz, ES44AC, JimB and 3 others like this.
  2. Jabroni

    Jabroni Active Member Supporting Member

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    Porter cable? Howd you diagnose ?

    Fixing your own stuff is satisfying. Good work!
     
  3. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    It's a Makita, the white series comes with smaller batteries I think.

    I have an electronics background and a hunch told me the FET was bad, it's kind of where the rubber meets the road.

    A quick test with a meter confirmed this.

    Thanks, it is always nice to figure stuff out :)
     
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  4. Jabroni

    Jabroni Active Member Supporting Member

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    Ah. Cool! Looked light gray, which is why I assumed pc.
     
  5. GoWolfpack

    GoWolfpack Member Benefactor Charter Life Member

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    Looks like you've been watching a bunch of AvE videos. Way to go on the fix, I don't think I would have attempted that repair.
     
  6. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    AvE is the man.

    Most of my drive to fix things came from not having money to replace them in the past. I mean, I still don't have the money to replace things, but I didn't in the past either.
     
  7. ECNC

    ECNC Member

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    Nice fix! What does "FET" stand for?
     
  8. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    Field effect transistor
     
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  9. Red Marley

    Red Marley Authorized person Charter Member Supporting Member

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    What is a MOSFET and how does one go about repairing it?
     
  10. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    Bought a new one at digikey and soldered it in.

    Edit- in the picture, I have a screwdriver pointing to it. It's basically an electronic switch.
     
    Last edited: Apr 3, 2020
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  11. ECNC

    ECNC Member

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    Now that I know what FET is and what it does ( I just googled it) I wonder how many drills I have thrown out because of that transistor.
     
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  12. noway2

    noway2 Senior Member Charter Life Member

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    Let me guess, too much load while holding it a less than full speed putting the FET in the linear region (instead of saturation) where you have both decent Vds and a fair amount of Ids?
     
  13. Schattenreiter

    Schattenreiter Member

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    Aww now you're just showing off. :p
     
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  14. frakncylons

    frakncylons Negative, I am a meat popsicle. Supporting Member

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    Oh there was lots of Ids, that's for sure.

    Starter went out on the mower. The Makita started it up two weeks ago fine, but it gave up last weekend.
     
  15. noway2

    noway2 Senior Member Charter Life Member

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    Doh! (said in my best Homer Simpson voice).