3 Major Components Replaced In Power Section
A guy who lives near buy came see to me in my shop and asked if I know how to repair a USB charger that he brought from USA. I told him, you put in the 220 volts didn’t you? With a smile and nodding of the head he said yes. I asked him to bring it over and I can take a look at it. He said he will be right back.
Soon enough, the guy came back and brought the USB charger with him.
That is the specification of the USB charger that he brought. And as you can see it runs on 120 volts.
These are the charging ports and there is also a 110 volt outlet on the bottom of his charger.
Now, the challenge for me was to open this charger. I tell you, it was not easy at all.
It took me a while figure this out. First, you have to take this top off. The way to do it is by pressing down and then turn clock wise turn and it will come off.
When taking that round piece of plastic out, you will be able to see this but we are not done yet.
There are two screws holding the two pieces together. One already out, and the other is marked.
The two side of the charger came off and the first thing that I saw was the plugged capacitor. That was not a happy sign because I am sure other component were shorted as well.
As indicated by the arrows, I found the fuse open and in relation to that, I am almost sure that the bridge rectifier is shorted as well.
Upon checking all that, the fuse, bridge rectifier, and the capacitor needed replacement before I go any further with the repair.
Once I replaced these parts and connected it to a step down transformer 220 to 110 AC volts, the device worked.
As you can see the charging icon appeared on my Iphone display. 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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https://jestineyong.com/ld7575ps-power-ic-shorted/
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Parasuraman
June 28, 2018 at 4:34 pm
Well done! An otherwise tricky job completed in a cool way because of your professionalism!
Waleed Rishmawi
July 11, 2018 at 2:38 pm
Parasuraman: thanks. I appreciate the support and the encouragement
Robert Calk Jr.
June 28, 2018 at 5:13 pm
Good job, Waleed. I'm sure that he will be more careful now before he plugs devices into the mains power.
Waleed Rishmawi
July 11, 2018 at 2:39 pm
Robert: not all customers are careful. today I got two machines that runs on 110 but were inserted in a 220 power wall plug. they were blown beyond repair sad to say
Andrew F. ali
June 28, 2018 at 9:08 pm
Nice job.
Waleed Rishmawi
July 11, 2018 at 2:40 pm
Andrew: thanks for your support and encouragement
albert van bemmelen
June 28, 2018 at 11:36 pm
I guess that the customer can't do anything with the USB charger at home without a step down transformer? Even repaired it will be useless without one.
Waleed Rishmawi
July 11, 2018 at 2:43 pm
Albert: that is very true. a lot of people buy stuff from USA thinking that they are wise in saving money but that is not the case. for example. a lady came to me with a coffee maker that was purchased in USA that runs on 110 volts 900 Watts power. she bought the machine for 25 dollars but she has to pay another 150 dollars to get a step down transformers that can handle such power rating.
Debirt Maynard
June 29, 2018 at 5:38 am
Very quick and efficient fix after deconstruction effort.
Waleed Rishmawi
July 11, 2018 at 2:45 pm
Debrit: it was not that quick. it took me a while to figure out how to open the device but once it was opened, all went well. thanks for your support.
Mark C.
May 25, 2023 at 5:56 pm
Where did you aquire the new replacement components?
Did they match to a tee? Or was there some flexibility in the components current?
Great job by the way!
Thanks,
Mark
Yogesh Panchal
June 29, 2018 at 10:35 pm
Good Job! Waleed.
Waleed Rishmawi
July 11, 2018 at 2:45 pm
Yogesh: thanks and I appreciate the support and the encouragement