From: ehsjr@verizon.net   
      
   On 1/30/2024 3:45 PM, Mike H wrote:   
   > I am trying to repair my Milwaukee M18 vacuum; model 0880-20. I left it   
   outside, it rained, and the rest is history.   
   >   
   > I have only a very rudimentary knowledge of electronics from building   
   Heathkits 45 years ago. That being said I am not afraid...   
   >   
   > Using my multi-meter as a continuity tester, I discovered a transistor that   
   got rusty from the rain and does not appear to be functioning.   
   >   
   > Can't seem to post a photo but it has 3 lines of text:   
   >   
   > IRF1404   
   >   
   > IOR P446D   
   >   
   > TONH   
   >   
   > Google search has not yielded any results. I do not have a schematic. The   
   vac is powered by a 18V lithium battery.   
   >   
   > In my testing I discovered if I connect a jumper between the left prong and   
   the center prong, the vacuum seems to operate normally. If that is safe to do,   
   I am happy to just solder a piece of wire between those prongs and call it a   
   day..   
   >   
   > Mike   
   >   
   >   
   >   
   >   
   >   
   >   
      
   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   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)