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Reverse engineering the driver board from an ultrasonic cleaner with a short circuit. (discuss.tchncs.de)

submitted 4 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 0 points 4 months ago

Have you tried putting it in an ultrasonic cleaner

[–] umbrella@lemmy.ml 0 points 4 months ago* (last edited 4 months ago)

i think it'd be useful to isolate the issue and get it working again first. the circuit is simple enough you can test almost everything individually.

are those wet logic gates and diodes working correctly?

[–] Voodoo3dfx@lemmynsfw.com 0 points 4 months ago

Have you tried unsoldering the tiny bridge rectifier DB1 and meter the four diodes within it?

[–] Mpatch@lemmy.world 0 points 4 months ago

Well I would start of by testing the shit stained components on back bottom right. That looks to be the most significant amount of damage.

Or you can do it the good old read the smoke signals. And force power in to by putting a bigger fuse and letting the part that's fucked burn up and show you the way. But you kina only have one chance at it.

What is the load on the relay?