Question about AOpen Power Supply: ATX-300GU (PS4300GU) Power Supply

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ATX-300GU PSU: 32V around Q4/Q5 circuit

I have an A Open ATX-300GU power supply. I have had it for about 7/8 years. Recently my computer did not switch on and I found the problematic source to be this PSU. The two 1k resistors around Q4 & Q5 got burned. I used a multimeter and saw that there is 32V on one side of the resistors, when on a working PSU it reads about 11V. What could be the fault? Where can I look to see which component/s need replacement?

Thank you

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Could just be the regulating power transistors are burned out or one of their biosing components, there a few meaty capacitors that may be causing a surge, but the safe thing to do would be to start with a new one, the reason is, modern drives are so sensitive that you could blow their circuitry and then lose the harddisk! All the best - the Yeti

Posted on May 17, 2009

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Posted on Jan 02, 2017

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The PSU bestec atx-250-12e is dead, there is an easy fix for it


Hi,
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http://itemlistings.ebay.com/sdcsrp?fl=360131455504&product=bestec+atx-250-12e&sconstraints=PriceMin.Value%3D23.00%26PriceMax.Value%3D45.59

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hello!

I guess that the computer have a one year warranty, You can claim a warranty anytime you want. But if has no warranty at all then you can repair the PSU by your own, Open the PSU and find any busted parts or maybe the fuse blownout that is very cheap you can replace that by your own. If afraid to do so, then let the repairman do it for you.
If no hastle it is recommended to by new PSU for your system.

Hope this help, best regards, melnavz

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You can try to rearrange from ATX form to dell form.
Here is ATX arangement
http://en.wikipedia.org/wiki/Computer_power_supply#Wiring_diagrams
and here is dells arangement
http://www.jdresearch.com/icon/shark20pin.jpg

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reg desktop computer ? 4 screw on back unplug it out buy new one atx style for latest computer sum use mini small power to fit in smaller cases micro atx let me know more info

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