Troubleshooting And Repairing ATX Power Supply

Troubleshooting And Repairing ATX Power Supply (Brought to you by Jestine Yong)

I hope that you have enjoyed the short report of “The Easy Way To Understand Switch Mode Power Supply”.  Here I would like to share another article with you that talks about how I have solved a slightly higher output voltages in an ATX power supply. Due to this higher output voltages condition, the CPU would not boot. Let’ start- One of my customers had asked me to repair his ATX power supply. I told him to get a new one (since it was very cheap nowadays) but he said he couldn’t find one that suits his customer’s CPU. He wanted a power supply that is either same size or smaller then the original one with same or higher specification but all he could find was a standard size ATX power supply! For your information, the standard size ATX power supply can’t fit into the PC. As a favor to my customer, I took up this repair job.

 

When the power supply was switched on, measurements were taken. The results were over voltage. The 12 volts line shot up to 13 + volt and the 5 volts line became 5.6 volts.   After the casing was removed, I found it very dirty and I used a vacuum cleaner and a brush to clean off the dirt. Then I saw four filter electrolytic capacitors had bulged and you could see it at the top of the capacitor.

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