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Power supply ripe for the picking
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jumpinmp:
Hey everybody. I came across this post trying to troubleshoot the HM310P I just got from Aliexpress. The unit came nonfunctioning, and it's been a pain messing with the store's customer service that I purchased the unit from.

My board looks identical to another board that somebody from this thread posted up on Sigrok.

I just picked up soldering a couple months ago, but that's as far as my knowledge goes at the moment.

I was wondering if somebody could help me identify a few components that I want to replace.

Here is the original photo posted to Sigrok: https://sigrok.org/wimg/8/8c/Hanmatek_HM305P_inside_power_front_left.JPG

Here are some photos on Imgur: https://imgur.com/gallery/C5Kkau2

1.)D19 - half missing diode

2.)C10 - blue capacitor, looks like it's bad or somebody touched it with a soldering iron while touching up U3; it has what looks like a melted line from top to bottom

3.)U3 - part looks OK probably, but there's quite a bit of flux around it.

I'd like to replace those 3 parts, but I'm not quite sure what to replace them with to try and get my new machine working. Any help would be greatly appreciated.

Thanks,
Ryan

edit: I've figured out what C10 (https://www.digikey.com/en/products/detail/murata-electronics/DE2E3SA222MA3BT02F/10699838) and U3 (https://www.digikey.com/en/products/detail/everlight-electronics-co-ltd/EL357N-G/2675528) are. I think.

I'm still not sure about D19. I think it might be something like this https://www.digikey.com/en/products/detail/nextgen-components/LL4148/14288085?s=N4IgjCBcoLQCxVAYygMwIYBsDOBTANCAG4B2aWehA9lANogCcYYADCyALqEAOALlCBABfEUA, but who knows.

Another thing I noticed is I have a couple of stacked resistors on R41 that appear to be touching the capacitor on C56. The top resistor is a 1003. I'm not sure about the bottom resistor yet.
https://ibb.co/d77cSXN

In the next couple of days I'm going to order some parts from digikey and have a go at it. I don't have high hopes, but wish me luck, lol.
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