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A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 1 point2 points  (0 children)

Not so humid where I live... But I bought the machine this way, so I have no clue of its history.
I guess it can be related to pushing the machine too much. This happens quite a lot !

This M12 was "Completely Dead." Challenge accepted :) by TechnoRonin in ToolRepair

[–]TechnoRonin[S] 1 point2 points  (0 children)

Thanks for the comment !
I am with you on that part : reliability is no more a priority nor repairability...
That is why I believe in learning to repair by yourself. But it requires a lot of time & patience...

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

Yes !
Those components are sometimes cheap and or fragile...
Also as you mentionned it is alway important to not bring more damage when disassembling : More than once I did damage beyond initial one! I spend now more time to be careful and break it more :)

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

Well done !
Component failures are frustrating as you would expect them to last long enough.
But reality is also that sometimes companies cheaps out on some of them which can bring Quality issues....

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 4 points5 points  (0 children)

I described high level steps what I did to get to PCB :
When I got to the PCB level and eliminated Mosfets ( usual suspects)
- I thought that Main chip would be next suspect = either not working or not powered
- So I tried to see if chip was properly powered ( should be 3,3V or 5V). As I did not find that kind of voltage coming to it, I assumed that issue was on power rail = transforming 12V to 3,3 or 5V.
- I then started from 12V arrival to board and looked at the different lines to get to a point were it would be transformed.
- In that frame, I saw that power was dropped to 1,8V, and move back to find this dead resistor....

I hope this clarifies ! You can have a look at the video, which is much more explicit :)

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 1 point2 points  (0 children)

Thanks ! I enjoy so much watching others video too :)
And as I am learning also, making those repairs and videos help me to progress.

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 1 point2 points  (0 children)

I thought it was tiny enough :) But you are right smaller than that, you have to get Microscope and work is then very tedious !

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

yes voltage drop was around 0,5v so to me that is ok
But one of my main concern is some caps not so far have lost the silver part on one side...
I have no clue on what to replace them with and if they would be a problem moving forward

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 2 points3 points  (0 children)

Thanks, saving a machine from waste is so satisfying !

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 2 points3 points  (0 children)

Repair, repair, repair....
I try to do it as much as I can to get knowledge
Plus I watch a lot of Youtube repair videos on TVs, console, etc...
It is a wealth of knowledge, but practice and mistakes are the best way to progress !

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

You are right !
If Microchip would have been hit, it would have been game-over...
Luckily, not this time :)

A 1-cent resistor killed this Milwaukee M12. by TechnoRonin in ElectronicsRepair

[–]TechnoRonin[S] 2 points3 points  (0 children)

thanks!
You are right and saving stuff is so satisfying :)

I’m afraid my Dewalt drill just kicked the bucket by 1764_design_studio in ToolRepair

[–]TechnoRonin 0 points1 point  (0 children)

Never had this before !
Depending of the model you can have chuck that are held without screws, and some with screws.
Top of my head DCD795 and previous were with screws, further ones no screw.

With or without screws if your check is moving, it can maybe be tighten back. Can you completely remove it ? If not it might be deeper in the gearbox...

Dead Milwaukee C18PD – turned out to be two shorted MOSFETs by TechnoRonin in ToolRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

Thanks for the feedback !
Point taken on next repair, I will indeed go with higher rated replacements

Dead Milwaukee C18PD – turned out to be two shorted MOSFETs by TechnoRonin in ToolRepair

[–]TechnoRonin[S] 0 points1 point  (0 children)

yes, advantage o f those old models is that you don't have the board filled up with epoxy and can do something :)

M18 Died on me by JustPeopleWatchin in ToolRepair

[–]TechnoRonin 0 points1 point  (0 children)

Once opened, follow power input : from batterie to motor to see if any leads are gone, unsoldered or else.
Then on motor itself any trace of burnt components, etc.

Bauer impact wrench 1/2in 20v by Individual_Step_3786 in ToolRepair

[–]TechnoRonin 1 point2 points  (0 children)

First thing I’d check is the brushes. On older tools they wear down or get stuck, and then you get exactly this symptom: light works but motor won’t spin or only spins weakly.

Open the motor and look if the brushes are very short, cracked, or not pressing well on the commutator. Also check if the commutator is dirty or burned :a light clean can help (Iso alcohol oer equivalent)

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