this post was submitted on 08 Jan 2026
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Reverse engineering the driver board from an ultrasonic cleaner with a short circuit. (infosec.pub)
submitted 2 months ago by sima214@discuss.tchncs.de to c/askelectronics@discuss.tchncs.de
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I got a used ultrasonic cleaner with liquid damage for almost nothing and I am trying to repair it. So far I've confirmed that the board has a short circuit between live and neutral somewhere after the relay. Also, while reverse engineering it, I noticed something that seems weird. When the relay closes, it adds C3 in parallel to C2, both feeding the logic circuitry.

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[–] tehmics@lemmy.world 16 points 2 months ago

Have you tried putting it in an ultrasonic cleaner