12V Power Supply Repair

Very fine video showing all what is required from carefully opening the small box to examining the internal circutry, finding the faulty component and performing the repair and finishing the repair job.All done with very fine images and good explanatiations during the work.

This was so much fun to watch and discover these problems with you. I've had devices that came back to life once the shorts had been resolved just from cleaning the PC board. It also looked like R10 had been rusted at the bottom, but that's great you found it as a cap that was messed up. Great video, 5 years old and one of the best. Few people have a camera set up to allow the viewer to inspect components visually with the tech.

I don't know much about electronics but as a doctor I've sewn plenty of fingers and thumbs back together. That knife!!! Apart from the scary bit I really enjoyed it. Thanks.

This is the first video as to where I can at least see all of the parts for myself. Thank you for that info as well on what you used. Now if many, many other u-tubers would follow with your example then they would probably grow to millions of fan based customers wanting to learn electronics. Good video all in all as well.

Lovely Video. Thanks for all the trouble shooting steps you have taken to arrive at which component was at fault! Cheers

I wish you would have shown how to test all the components that you said you tested and they were good. Thanks for the video.

Whenever I troubleshoot power supplies and other electronic equipment I always suspect any electrolytic capacitor that is mounted close to a heat source, such as a heat sink. In this video the capacitor that failed is mounted right next to what looks like a FET or some other transistor mounted on a heat sink. The heat generated by this component dries out the capacitor and hastens it's demise. I see this all the time in power supplies in LCD TVs, computers, etc. Sometimes you can actually see the capacitor bulging on the top or bottom as the heat caused it to swell up and fail. Most of the time you can simply replace the capacitors to fix the problem, however on occasion the defective capacitor(s) will cause other components to fail which can be more difficult to troubleshoot and find replacements for.

Thanks for the video John. It just goes to show how a device can be rendered useless by one failed component. We all come across this sort of thing every so often and just pitch the device into the bin without even trying to fix the real problem. This makes me think of all the electrical stuff I've thrown in the garbage when it could have been fixed by replacing a $2 part.

Excellent video close-ups! Best I've seen on YouTube!

Dear JW, I always enjoy your informative videos.......Please keep up the good work..MUCH better than what is on TV nowadays !!!

Great video as always .Keep the good work sir .You are the best teacher .I have learned a lot from you 😁

Those are normally sonically welded (as you discovered). If you think that there's a screw lurking under a label, it's better to just give it a couple of pokes with an x-acto, awl or similar to "break thru" the label. This way, if there aren't any screws you haven't destroyed the label for no good reason. I prefer an x-acto for this job because if you do discover a screw hole, it's easy to make a clean round slice around the screw hole for screwdriver access.

Thanks very much, lovely camera work and great Cricket Commentary!!

Thanks for taking the time to do the video, I learned a little and have a few PS's to play with.

close-up camera view during inspection is extremely helpful

Well done sir! You inspired me to do better next time I get a phone call like that, recognizing there's another person that needs help on the other end of that call.

Hi John, Thanks For the teachings very very helpful am grateful

Nice - i couldn't help thinking, "hey, this fellow sounds a lot like the voice in my head when i'm muddling through some problem or another (but with an other-side-of-the-pond accent)." Some of these power supplies/adapters can be so intimidating... it's refreshing to see a unit with a straightforward layout. I'm working on a few Dell PC power supply units with no obvious faults, and this video gave me some inspiration to dig back in. I think it's time to invest in a reliable capacitance tester, since problems so often come down to those failed electrolytic caps.. just haven't seen them vent from below in my limited experience. Good to be aware of - Thanks for sharing!

Your repair video is worthy of my subscription. Well done.

Incredible troubleshooting Techniques to repair switch mode power supply. Thanks for sharing your excellent experience in Electronics