Question about ASUS PSU | A-45GA 450W RT (A45GA) Power Supply

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Suddenly power failure ,when the power returning the pc switched ON the SMPS fan and PC also not working.

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My advise to you is to never turn of your computer!
the constant start and stop put stress on your power supply not to mention dust build up and if not properly cleaned the startup process can cause a short which I've seen so many times.
I have a computer which is 8 years old I never wanted to turn it off but leaving for two weeks vacation I turn it off. On my return the startup it shorted yeah dust build up.I had to replace the power supply, still running now. (A warm drive is a happy drive)

Posted on May 28, 2014

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Posted on Jan 02, 2017

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pravinbhavsa
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SOURCE: PC smps power supply problem

ok you open the pcb check the fuse first then replace it if faulty if it burns again then check 4 diodes then see if 200v big capacitor is expanded or not if so then replace it if not then check diodes after transformer if short then replace it

Posted on Nov 21, 2008

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remove all the ram from motherboard and switch on the system and see it is working or not like just on and fan are rotating and the smps fan is also working and your system is giving beep sound for ram.try with other smps also some time problem with power supply also. Remove the connector of power switch and restart switch and directly try to on from shorting the connector with the help of pen or screw driver point. Some time faulty switch also give problem. Just try all these possibilities.

Hope this helps. Please rate my response.
Thanks.
Have a good day.

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Verify whether the SMPS fan is working or not, working of this fan indicates that power output +12V is OK, if not you need to check the SMPS, probable reason SMPS fuse blown.
If you observe SMPS fan rotates for few seconds and then stops, this indicates minor repair is required, let me know the symptoms.

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the problem is with yur smps i think.yur turn on button is directly connected with the smps i think.if the smps fails to run yur system will hang.please wipe and dust yur smps completely and see if the system is working.. or else you should change yur SMPS..

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If not change the SMPS it may be due to failure of SMPS.

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