I replaced the 180 watt with a 300 watt ATX some time ago. But it died. When I push the on/off button, there is a click but nothing, nada. Power cord is ok cuz I used it on the video to check. No fuse on the supply. Also, I have the impression that hp power supplies have a little power on the 3v(?) even when turned off to save the little battery. I have no power on the battery line.
I'd like to confirm the last point before splurging for another power supply.
2007-02-23 00:34:09 · 2 answers · asked by kyq 2 in Computers & Internet ➔ Hardware ➔ Desktops
Thanks everyone and you are on the mark Taz. Needed confirmation and I didn't know about the purple backup 5 volt. I checked every lead and there is no power on any. With luck it is just the power supply & nothing on the motherboard screwed up.
Is there anywhere I can find a schematic for any of these ATX supplies? ditto for the matching circuit on the motherboard? Don't have to be specific and matching, just want to have a general idea. Thanks.
2007-02-23 01:33:55 · update #1
More than likely it died. It happens. Especially if you cheaped out with the replacement. All ATX power supplies have a +5v VSB "Voltage StandBy" lead to supply the powerup circuits on the motherboard. You can test for this (use a meter of course, not just an LED) between Pin 9 (grey wire) and any ground (black). If there is no voltage, then the power supply is dead. If +5v is there, then you can try to 'jumpstart' the supply to see if it really will power up. Do this by shorting the PWR_ON lead (Pin 14 - green wire) to any ground. Only do this for a second or two just to see if the fan kicks on (and of course do NOT have the connector plugged into the motherboard!) then remove it. If you get nothing, the power supply is shot. If the fan comes on, then you could have a deeper problem with the power supply, or your motherboard is shot. In this case, go out to CompUSA and get an ATX power supply tester for $10. You plug it into the ATX connector, then plug in the power supply. The tester will turn on the power supply then show you via LED's if all of the power rails are functioning. The LEDs should be all green. If any are red, then the supply is shot. If they are all green, then replace the motherboard.
2007-02-23 01:02:10 · answer #1 · answered by Taz 3 · 0⤊ 0⤋
smell the power supply if it smells burnt it is..... next did you replace a drive or memory? check all connections.. remove and reinstall
2007-02-23 00:45:36 · answer #2 · answered by GENE M 2 · 0⤊ 0⤋