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This toasty boy is the least of the problems of this board. They violate a lot of clearance rules between line voltages and low voltage DC – which ends up on the USB connector :/ 1
This toasty boy is the least of the problems of this board. They violate a lot of clearance rules between line voltages and low voltage DC – which ends up on the USB connector :/
This is a DC motor speed controller – the toasted part specifically, as pointed out by a champ on a discord, is a current sensor. No clue why that failed, but the board has a lot of other issues.
We’re at the point where will be probably be reporting them to market authorities because it’s just not safe to install 0.4 mm or so clearance between 230V and DC ground (https://imgur.com/a/gAmRpKf). In a metal shop full of metal dust everywhere. With an uncoated board in an enclosure that might just stop chips, but is definitely full of conductive dust.
We got that board as a replacement for the antique older one which is also broken. The older one is not especially nice either in terms of current Standards, but it has no connection to the rest of the dc world and the schematic is around, so it’s what I’m fixing now. Probab just some leeky caps that ruin the DC motor acceleration ramps