atx psu operation

[[email protected]]

greetings!!!

can anybody in this newsgroup give me an idea on the detailed
operation of an atx psu. i already knew from this group that if i short
out black and green connection in the psu, it will power up. i tested
it and it worked. but i want to know the concept behind its turning
on/off.
this is because i have an atx psu here that does not power up even
connected to the motherboard or when shorted out. (black-green). i want
to troubleshoot it but i do not want to start yet until i already
understand how this psu operates so that i may know where to directly
troubleshoot the problem. is it in the primary side circuit or in the
secondary side or logic/controller for the on/off state.

thnks in advance,

ian

 

[[email protected]]

thank you for your response. i was enlightened.

 

[DaveM]

greetings!!!

can anybody in this newsgroup give me an idea on the detailed
operation of an atx psu. i already knew from this group that if i short
out black and green connection in the psu, it will power up. i tested
it and it worked. but i want to know the concept behind its turning
on/off.
this is because i have an atx psu here that does not power up even
connected to the motherboard or when shorted out. (black-green). i want
to troubleshoot it but i do not want to start yet until i already
understand how this psu operates so that i may know where to directly
troubleshoot the problem. is it in the primary side circuit or in the
secondary side or logic/controller for the on/off state.

thnks in advance,

ian

Ian,
Look at the web page at http://www.pavouk.comp.cz/hw/en_atxps.html. It has
a schematic and theory of a typical ATX power supply. Keep in mind that
this is just one example of a design.. the unit that you have may be
similar of very different.

Above all, when you start poking around inside the power supply, be very
careful. Lethat voltages are present inside the unit, and will maim or kill
you if you aren't careful.

Cheers!!!
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

 

[quietguy]

I would suggest that unless you are very experienced in repairing mains
powered equipment that you would be much safer picking one up from
computers thrown in the tip - very easy to electrocute yourself poking
around one of these

David - who shudders at the thought of beginners playing with these power
supplies