softpower switch on PC supply doesn't work - any ideas?

[Matt Russell]

I've had a few ATX supplies die because they don't turn on using the
mobo controlled soft switch. Does anyone know of a likely cause? How
about a typical schematic for this circuit?
Tx, Matt

 

[default]

On Mon, 24 Oct 2005 13:46:42 GMT, Matt Russell <matt@farrwood.com>
wrote:

I've had a few ATX supplies die because they don't turn on using the
mobo controlled soft switch. Does anyone know of a likely cause? How
about a typical schematic for this circuit?
Tx, Matt

Don't overlook the obvious like the silly pushbutton on the front or
where it plugs into the mobo.

See http://www.pavouk.comp.cz/hw/en_atxps.html

For a schematic of an ATX supply. We owe Pavel Ruzicka a dept of
gratitude for taking the time to reverse engineer this.

The start up line 5V start bus is a separate tiny supply that is
running whenever the computer is plugged in (and turned on) It shares
the input rectifier and filters with the main supply but is otherwise
totally independent. A little three terminal regulator handles the
output.
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