Youngyear ATX power supply - Electronic Circuits Projects Diagrams Free

vinke · 24th June 2008, 06:28 AM

Hi everybody,

I have a rather new ATX PSU of 480W and its not working anymore. I was connecting an external fan to it while it was running and by accident the +12V and ground got connected( the fan had no socket). I thought it wont be a problem as most ATX PSU have short circuit protection, but now its not starting anymore. I have removed it from the pc and connected the green and black wires together, it doesnt start either. Its most probably a problem with the starting circuit, and i want to try and repair it as the PSU is rather new. Does anyone ever had this problem? Any tips that could make the repair go quicker? And if anyone have the schematic of the PSU "youngyear ATX-480" or any similar PSU, pls forward me it will really help me. thanks in advance.

Gayan Soyza · 24th June 2008, 06:33 AM

Check the fuse first.

Also test the TO220 transistors near the high voltage capacitors.

vinke · 24th June 2008, 02:08 PM

Quote:

Originally Posted by Gayan Soyza

Check the fuse first.

Also test the TO220 transistors near the high voltage capacitors.

the fuse and transistors ok. the power_on signal is not been acknowledge i think. if i could have the schematic would be simpler to troubleshoot.

jpanhalt · 24th June 2008, 02:23 PM

You may need to do something with the PowerOK (often grey) wire. Check here: ATX power supply connector pinout and signals @ pinouts.ru

John

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24th June 2008, 06:28 AM	(permalink)
vinke	Youngyear ATX power supply Hi everybody, I have a rather new ATX PSU of 480W and its not working anymore. I was connecting an external fan to it while it was running and by accident the +12V and ground got connected( the fan had no socket). I thought it wont be a problem as most ATX PSU have short circuit protection, but now its not starting anymore. I have removed it from the pc and connected the green and black wires together, it doesnt start either. Its most probably a problem with the starting circuit, and i want to try and repair it as the PSU is rather new. Does anyone ever had this problem? Any tips that could make the repair go quicker? And if anyone have the schematic of the PSU "youngyear ATX-480" or any similar PSU, pls forward me it will really help me. thanks in advance. __________________ Have a nice day.Be happy!! $ViNkE

24th June 2008, 06:33 AM	(permalink)
Gayan Soyza	Check the fuse first. Also test the TO220 transistors near the high voltage capacitors. __________________ Gayan My Website http://gsmicro.blogspot.com/

24th June 2008, 02:23 PM	(permalink)
jpanhalt	You may need to do something with the PowerOK (often grey) wire. Check here: ATX power supply connector pinout and signals @ pinouts.ru John