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Someone has to have done this

A

alocurto

Platinum Member
I posted this in the hardware forum w/ no luck.

I have built a computer w/ an AT power supply. The problem is that I have no switch to turn the AT power supply on. I have 4 leads that are supposed to go to the switch I do not have. Has anyone ever powered on an AT power supply w/ out a switch? Please post or PM.

Thanks!

-alocurto
 
Not really done.
So it's not a hands-on experience.
I'm assuming you got an atx case, and an at mobo and an at power supply.
go in an hardware store, buy a switch and conect the cables the way they were in the old case.
Should work, but make sure the switch is not for AC!
Again, never done it 🙂
 
I wouldn't recommend that. Notice how big the cable to an AT switch is? I believe it's got the whole 120V running through it, get a switch or new PS, don't go messing with line current...
 
I agree with BA in that I believe the whole 120V is running through that line, but I also agree with Usul in that I don't see any reason why you can't do it yourself. Just make sure that the switch is rated to handle the power you're putting through it.

PH
😀
 
If you don't mind a half-assed answer, I remember reading somewhere about being able to turn on a system like that by using a screwdriver to short two pins on the mobo (where the case switch would have been connected). It would have meant holding the screwdriver across the two pins that the switch connected to. I can't find the reference, though.
 
Kranky, I believe that you are thinking of "jumpstarting" the soft power cable of an ATX board. You can use a Screwdriver to short out the "soft" power pins to make a board fire up. Many techs do this when all they have is a board hooked up to PS with no case.

I don't know of any way of "jumpstarting" an AT board and PS though 🙁
 
Generally you should expect to find 5 wires coming from the P/S that would normally go to the switch. The color coding may vary depending on the standard in use.

The colors will be as follows:

Black - Hot AC (117V) US Electrical Std
Brown - Hot AC (117V) Int'l Std

White - AC Neutral US Electrical Code
Blue - AC Neutral Int'l Std.

Green - Earth Ground - US Electrical Code
Green w/yellow stripe - Earth Ground Int'l Electrical Std.

The switch on AT power supplies switches both the HOT and the Neutral legs. To connect without the switch, connect the following:

Black to Brown - This Connects the Input 117V Hot to the Power Supply Hot Input. Insulate this very well. This line has lethal voltages present.

White to Blue - This Connect the Input Line Neutral to the Power Supply Line Input. Insulate this very well, Lethal voltages may be present (not supposed to be but if you have wiring problems in your home/office this line can carry high voltage.

Green/Green w/yellow stripe to your computer's chassis. - This is the safety ground to (hopefully) prevent the case from carrying high voltage.
 
Thanks for clarifying, vi_edit. I guess it wasn't a half-assed answer after all -- it was full-assed. 🙂
 
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