A Shorted Power Supply Was Brought Back To Life. Model: CH-600-12
A store owner and a friend of mine brought this power supply for repair. He said that it just stopped working for some reason. He wanted it as soon as possible so let the repair begins.
This is used to power up LED light strips in his store.
He is doing some kind of celebrations since he had this store for over 5 years now and wanted the LED lights all powered up.
This power supply has three terminals that can output 12 DC volts at the same time at the rate of 50 amps rate.
There is no obvious damage shown here but since it is dead my first step is to check the main fuse and beyond.
With the help of my son Mark I was able to capture some shots here so he was a big help here.
As seen in the photo, the fuse is open so the next step would be checking the bridge rectifier for damage.
As expected, the bridge rectifier was damaged as well and needed a replacement. It is a 15 amp part and had to be replaced with the same specs.
After further checking on that board I found two shorted Mosfets with part number 20N60C3. I did further testing on that board and find out that no more damaged parts there.
Click here to access the 20N60C3 Datasheet
I replaced the bridge rectifier, the two Mosfets, of course the fuse and tested through a current limiter.
The current limiter light was dim which is a very good indication that all is well and no more shorted parts on board. As seen, the power supply is up and running.
I called the customer for pick. He came right away and called me later on that everything was up and running the way it should be.
Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous article on A Faulty Controller Checked But Was Not Repaired
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Parasuraman S
August 26, 2023 at 8:40 am
Great! A friendly relationship strengthened! Happy to note your son helping you! How I wish I had someone like that in the home to be with me whenever I do servicing!
Waleed Rishmawi
August 26, 2023 at 3:54 pm
Parasuraman: thanks man. yes during the summer break my son when he has no outdoor activities going on he comes to the shop and helps me out there. of course he gets paid for doing it. have a blessed day
Kelvin
August 26, 2023 at 11:22 am
Well done sir
Waleed Rishmawi
August 26, 2023 at 3:55 pm
Kelvin: thank you sir. have a blessed day
Vasudevan.K.V.
August 26, 2023 at 2:18 pm
Thanks for publishing the repair article.
Waleed Rishmawi
August 26, 2023 at 3:55 pm
Vasudenvan: you are most welcome. have a blessed day
Albert van Bemmelen
August 26, 2023 at 3:13 pm
Thanks for sharing this repair and another mosfet datasheet Waleed! 50A at 12V equivalent to 600 Watt of power is quite a large led strip!
Waleed Rishmawi
August 26, 2023 at 3:57 pm
Albert: you are most welcome. this power supply is used in a shop that everywhere you look you see LED's in different color. have a blessed day
Yogesh Panchal
August 28, 2023 at 12:17 am
Good Fix! Waleed
Waleed Rishmawi
August 30, 2023 at 1:32 am
Yogesh: thanks man. Have a blessed day
maurice
August 28, 2023 at 1:27 am
50a for that tiny psu? I would'n trust that cheapy china made psu it could would deliver 50a. typical they lie about the specs.
Waleed Rishmawi
August 30, 2023 at 1:36 am
Maurice: I said the same thing till I ran security cameras off that tiny psu. That psu is not cheap and it works just fine. Have a blessed day.
Imoudu.O
August 28, 2023 at 5:59 am
Your son gets paid....hmm what a motivating tips.Thanks for sharing.
Waleed Rishmawi
August 30, 2023 at 1:37 am
Imoudu: yea I pay him to learn and get things done. No work no pay. Have a blessed day
lloyd
August 31, 2023 at 3:49 am
very complete
Waleed Rishmawi
September 1, 2023 at 1:27 am
IIoyd:thanks. Have a blessed day