Tricky Repair of Power Driver for CNC Machine


Designing and building something from scratch is one thing. But repairing fried electronics is a much different type of dark art. This video from [Mike's Electric Stuff] is from more than a year ago, but we didn’t think you’d mind since what he accomplishes in it is so impressive. He’s got a burnt out pick and place hybrid power module which isn’t going to fix itself.

The power module construction includes a part that has chip-on-board-style MOSFETs and the circuitry that goes with them enclosed in a black plastic housing. It’s kind of like a submodule was encapsulated using the same plastic as integrated circuits. After cracking it open it appears the bonding wire has burnt away. [Mike] connects a jumper wire to one of the board traces in order to use an external MOSFET. This is much easier said than done since the module substrate is ceramic designed to dissipate heat. We’re amused by his technique of melting the jumper into the plastic housing to protect it from the heat sink that goes over the package. In the end he gets his CNC running again. This may not be the best long-term fix but he just needed to continue running until a proper replacement part arrives.

Oh, one more thing: the Metcal vacuum desolderer he uses in the video… do want!

[Thanks Buddy via Reddit]


  1. Whatnot says:

    I always though ceramics were good at NOT conducting heat.

  2. zaprodk says:

    Heat SYNC ?!

  3. fartface says:

    This is what it is like to have the proper tools. And you can get a lot of the real bench and rework tools on the used market. I love my hot air rework so I can do BGA and other large PITA devices without resorting to hokey methods.

  4. Francois says:

    routing the wire trough the melted plastic housing was clever!

    Nice work!

  5. static says:

    To call these repairs hack, would be criminal. Simply amazing work and skill level.

  6. sneakypoo says:

    You know why I hate watching his videos? Because he makes me feel like a drooling moron…

  7. Drake says:

    Gotta love the Hand CAM

  8. Rich Grise says:

    Heat sink, not heat sync. It’s the opposite of a heat source, not a synchronizer of heat.

    – Rich Grise, Self-appointed Chief
    Internet Syntax Police

  9. Sven says:

    Why do hackaday post these incredibly old videos as articles? This is 16 months old…

  10. KleenexCommando says:

    Metcal vacuum desolderers – suck. no pun intended. Having used plently of solder suckers, including the metcal and cordless plunger types, They all tend to go unused and wick wins out. They just never work as well as good solder wick does. From getting clogged up after a joint or two to tips erroding and loosing vacuum almost as fast. I did myself a favor forever ago and got rid of the metcal and freed up bench space and a power port on my metcal supply for a second pencil.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Get every new post delivered to your Inbox.

Join 96,656 other followers