Repairing cheap power supplies!
Published 2017-05-05
Parts
π Inrush limiting NTCs s.click.aliexpress.com/e/qNR7eMV
π Replacement transistors s.click.aliexpress.com/e/rB2BAAE
π10A power supplies s.click.aliexpress.com/e/EEu7yba
π20A power supplies s.click.aliexpress.com/e/JmYvRFI
Tools used (some are better versions of the tools I use)
π Proxxon mini vise geni.us/vise
π Knipex needle-nose pliers geni.us/KnipexPlier
π Knipex wire strippers geni.us/KnipexStripper
π Knipex flush cutters geni.us/KnipexFlush
π Wire crimping set geni.us/CrimpSet
π Soldering station geni.us/Soulderang
Product links are affiliate links - I may earn a commission on qualifying purchases (at no extra cost to you)
π₯ All my video gear toms3d.org/my-gearPlease do not attempt these repairs if you are not confident about your electronics skills. It is impossible to explain every detail in a video, so please proceed at your own risk.
π§ Check out the Meltzone Podcast (with CNC Kitchen)! Β Β Β /Β @themeltzoneΒ Β
π Enjoying the videos? Support my work on Patreon! www.patreon.com/toms3dp
All Comments (21)
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no telling if the 20a power supply is fixed without at least putting a modest load on it for a while.
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Sometimes you get electrolytic capacitors drying out due to high temp. Also the PWM IC can get damaged when the power mosfets go short circuit. Love your 3d printer channel - I have learned a lot. Thanks Tom!
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You only replaced the switching MOSFETs without checking anything else to find WHY they failed? Amazing.
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I was convinced he knew what he was doing until he failed with the 10A model.
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"Uh-oh the car doesn't start, tried turned the key twice. Well, the car is broken.. throw it away.."!! ;p
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Definitely would love to see more videos like this! My 3d printer build experience allowed me to fix my 500 dollar computer monitor by taking it apart and re-soldering the power connections. I've gotten 3 more years outa that monitor thanks to knowledge like this.
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I really liked this video, Tom. Not just the content (killer, as always) but the style, the pacing, the scene editing choices. It felt very "I Like To Make Stuff" and it felt like you were really able to convey more to your audience.
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Just send the defective one to BigClive, he loves that stuff ;)
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Love the speed, focus, and clarity. Great vid!
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You are by far my favorite 3D printing YouTuber to watch. Thanks Tom.
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You gave up to easily on the 10A supply!
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Great video! And love that lamp and paint job, super clean and techy.
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Best idea ever... if you post a video asking for help, probably get very few suggestions... post a video where you FAIL and everyone is in a hurry to jump on your failure and show you how good they are by telling you what you did wrong... now you have a bucket full of suggestions to try! Love it!
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Very cool LED light fixture. Have you thought about making a quick video about how you made it?
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Just an advice: it's always better to discharge the high voltage capacitors with a 100-470 kohm resistor. This way you're saving the capacitor from excedingly high currents through it.
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Thomas, I'm impressed much better than when you sometimes do wiring live !!!
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Wow that's such a cool ceiling lamp!
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I'd love to see more of your ceiling light. That is so cool.
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Thanks for finally deoxidizing and retinning the soldering iron tip at 4:40 or so. LOL Good, fun repair video, thanks again.
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Also a good thing to check and fix with these chiinese models is the grounding, I've had multiple ones with ground not connected to the casing..
