Post An0JBwQl5mWC4VdMEC by mauvedeity@mastodon.social
(DIR) More posts by mauvedeity@mastodon.social
(DIR) Post #AmzAi7SWWxewnTlh6e by foone@digipres.club
2024-10-14T04:20:14Z
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I'm not an expert on DC power supply design, but I'm gonna go out on a limb and say "well there's your problem"
(DIR) Post #AmzAuJE8bTM0lmqsds by foone@digipres.club
2024-10-14T04:22:48Z
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@krishean I can't smell it and I have the subject right in front of me! anosmia is sometimes a perk
(DIR) Post #AmzBJBZkBkrmHKouP2 by foone@digipres.club
2024-10-14T04:27:20Z
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I think it's that voltage regulator/mosfet right in the middle.
(DIR) Post #AmzBVuHFoXt0OTEmci by nblr@chaos.social
2024-10-14T04:29:38Z
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@foone Oh! Built in self-diagnostics has colored the area in black.
(DIR) Post #AmzBoECwS5QbQ3xNcO by foone@digipres.club
2024-10-14T04:32:56Z
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You. What are you?UTC 10N65KL... Unisonic Technologies 10A, 650V N-Channel Power MOSFET. There we go.
(DIR) Post #AmzCMh9HMBGZ1Xg86C by foone@digipres.club
2024-10-14T04:39:13Z
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The plug going out the left is the DC side, so this is a problem on the AC side of the power supply, which is the part I'm no good at. It definitely seems to be concentrated around that MOSFET, but those caps next to it look like they took the brunt of the damage. Maybe they were the source of the problem? If one of them failed-short it might have shorted to ground?This was plugged into a UPS (not a very good one, but one!), I'm surprised it didn't beep when this blew up.
(DIR) Post #AmzCc0Q5zNb58VqSZ6 by foone@digipres.club
2024-10-14T04:41:57Z
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I looked up the replacement, which says it's a "AC/DC Switching Power Supply Transformer 29V/24V 2A Adapter with AC power wall cord"okay I'm not happy with the voltage being a plus or minus! generally when you buy a DC power brick they tell you what volts you get, you know?
(DIR) Post #AmzCtnCPsj2RLUvbsW by ChartreuseK@social.restless.systems
2024-10-14T04:45:09Z
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@foone I suspect it's for an electric scooter/moped thing. And 24v would be the battery nominal voltage, for 2x 12v lead acid batteries. So 29v would likely be a reasonable charging voltage for that.
(DIR) Post #AmzEYgJ2VzctnI5TKS by moppi@chaos.social
2024-10-14T05:03:43Z
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@foone it has send his magic sparks !!!
(DIR) Post #AmzEkCcugjlnDgsQQy by foone@digipres.club
2024-10-14T05:05:50Z
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Anyway I bought a replacement. Just not from them.
(DIR) Post #AmzFCaUFZObLKUMMHQ by jaykass@mastodon.online
2024-10-14T05:10:55Z
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@foone looks like some spilled ice cream
(DIR) Post #AmzVx8oTsOCANV2iO0 by Gunde@mastodon.nu
2024-10-14T08:18:34Z
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@foone Well, think you are right 👍
(DIR) Post #An0JBwQl5mWC4VdMEC by mauvedeity@mastodon.social
2024-10-14T17:30:16Z
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@foone what are its pronouns?
(DIR) Post #An1nqrJUDMaxrAcSGW by nroach44@mastodon.social
2024-10-15T10:48:35Z
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@foone That FET will be the "chopper" that turns the AC->HV DC into 30+KHz AC (dry the wets etc.) input to the small transformer. If just that FET is blown up, it probably just failed short and blew up from the diode bridged AC.Prooobably should have popped a fuse first though.