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power supply question

S

shadow-13x

Limp Gawd
Joined
Sep 23, 2003
Messages
175
A friend has a KT7A-Raid mb/AMD Thunderchicken 1.0 with a 300w power supply. The power button on the front does not start the computer anymore. I took the 20 pin connector off and jumped green and black, and it does power up and the CD/hard drives spin up and run. I thought ok, bad switch. Cut wires off the back of the switch and touched them together, nothing. Then I took a paper clip and wedged it into the green and black on the back of the 20 pin molex and plugged it into the MB. Then flipped the switch on the back of the PS and computer started and ran. Is this a bad MB? I'm thinking that the front power button was doing it's job, the start signal never made it back to the PS. Am I right, or way out in left field in the rain?

ThE sHaDoW
 
Did you actualy try rewireing the button to the motherboard? You know, like the hdd led, reset button, power led ect.?
 
if you can't start it by jumpering the pins that the power switch connected to, i'd say bad mobo.

i usually just disconnect the switch and touch a screwdriver to the pins to see if it powers up. if it does, it's the switch, if not . . . keep going

from what you describe, it seems most likely the mobo
 
nas82 said:
Did you actualy try rewireing the button to the motherboard? You know, like the hdd led, reset button, power led ect.?
Click to expand...

No, it was a fully operational computer. So I didn't move any of the wires on the MB.

ThE sHaDoW
 
scalez said:
if you can't start it by jumpering the pins that the power switch connected to, i'd say bad mobo.

i usually just disconnect the switch and touch a screwdriver to the pins to see if it powers up. if it does, it's the switch, if not . . . keep going

from what you describe, it seems most likely the mobo
Click to expand...

I'll try the screwdriver trick this evening and report back.

Touching the two wires from the switch together last night did get the PSU fan to "twitch" but not keep going. Is it possible the 5vSB is dead or dying?

I put a meter on the 12v and got 11.48, 5v gave me 5.10 and 3.3v gave me 3.38 with a HDD, OD, floppy, and fan plugged into the PS, while jumping the green and any black on the 20 pin ATX. What color is 5vSB? What reading should I get when jumping green/black with a load?

ThE sHaDoW
 
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