when you short green to black wire what can be the cause, what to check(caps look ok)?
atx supply wont start
Aug 18, 2009
14 Replies
What's the open-circuit voltage on the green wire? What's the voltage on the "always-on" 5V wire? Forget what color it is. I assume you've disconnected the 20-pin plug and the 4-pin processor 12V plug and the disk drive plugs and the video card plug to isolate shorts.
probing the disconnected plug-green and red(5v) both 0 volts!
Grounding the green pin won't do anything if there's no voltage to begin with.
The "always-on 5V" ain't red It's purple.
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I have seen many P/S that do not conform to the color code.
all 0v strange
And I have seen PSUs (Dell !) that don't even comply with the pinout code :-)
Kind regards,
Gerard Bok
Not strange..."BROKE". You ain't gonna get nowhere until you get some volts on the green wire.
Google is your friend, befriend google. atx "power supply" schematic
=D0=DA=E0=D8=F8 =DD=D0=D2=D5=D4=D5=DD=D8 =E2=D5=DA=E1=E2 -
update double checked purple and green both 5v,yellow~0.5v and the rest
0voltsÝÐÒÕÔÕÝØ âÕÚáâ -
The green must be connected to COM before the supply starts. The purple is just a always on and it seems it's working. Just connect the green to black, and put a small load on one of lets say one of the RED wires (5 Volts).
The loading is very important, the PS won't stay on for more than a few seconds without a load. When I use a standalone PS I hang an old disk drive on it.
Open up your PSU & look for a blown fuse.
W
. | ,. w , "Some people are alive only because
\\|/ \\|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------
checked diodes and resistors with power off-ok,capacitors visually look ok. when you connect green to ground the fan starts spinning briefly (1/10sec), is there a generic 300-400w atx schematic someplace because google-ing as "Rexpower" did not help
ta delenda est
You might not be providing enough of a load. Try attaching an old hard disk to it.
Not that I know of.
W
. | ,. w , "Some people are alive only because
\\|/ \\|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------
None of the schematics at the google search string I suggested?
atx "power supply" schematic
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