iMac G4 ATX Hack?

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themike's picture
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Has anyone succesfully completed an iMac G4 ATX hack? I can't find the pinouts anywhere. I found a couple zombie threads:

http://www.applefritter.com/node/10729

The first seems to imply it is possible, though does not leave me with a clear idea of how to do it. Eeun, do you still have the pinout you offered iantm? I'd like to see it if you do!

This thread:

http://www.applefritter.com/node/10729

Seems to contain a partial pinout, however, mentions a blue and white line that are unknown. Does anyone know what they really are?

I also found this:

http://www.lbodnar.dsl.pipex.com/eServer/index.html

Which is a basic how-to for an eMac ATX hack, among other things. Does anyone know if the emac and imac share a common PS pinout?

Here is the emac:
20V 1 2 RTN
20V 3 4 RTN
C12V 5 6 RTN
C12V 7 8 RTN
RTN 9 10 DCO
RTN 11 12 PRO
FW 13 14 T5V
FW RTN 15 16 RTN

And the ATX wiring for the emac:
12V 1 2 Gnd
12V 3 4 Gnd
12V 5 6 Gnd
12V 7 8 Gnd
Gnd 9 10 Gnd
Gnd 11 12 leave open
12V 13 14 5V
Gnd 15 16 Gnd

Any ideas? I'd appreciate any input offered. I'll probably just try it with the eMac pinout, the worst that will happen is my already-dead iMac will continue to be dead.

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eeun's picture
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I never got past that point o

I never got past that point of my post of that old thread. ended up flipping the iMacs without ever charting the PSU further.
It was the apparent always-on status of the iMac PSU that had me confounded.
I'm hoping to get a couple more to tinker with, but that'll depend on when my usual source decides to purge them...between one week and two years from now Smile

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themike's picture
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Posts: 455
OK

Were you able to get one running off ATX? I'm not looking for anything elegant, I don't mind having to use soft and hard power, I just want to get this iMac working.

Thanks for the quick reply!

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eeun's picture
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No, never did. I ended up get

No, never did. I ended up getting the existing supply working properly, so it was no longer necessary.

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themike's picture
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What was wrong with it? Perha

What was wrong with it? Perhaps mine needs the same fix.

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themike's picture
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The first thread

I meant to link this as the first thread I was looking at-
http://www.applefritter.com/node/19200

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eeun's picture
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Re: What was wrong with it? Perha

themike wrote:

What was wrong with it? Perhaps mine needs the same fix.

Bad memory on one, bad thermal interface between CPU/heat pipe/case.

With the thermal issue, the iMac had apparently been sent out a few times for servicing, and came back each time with more thermal grease between the heat pipe and chassis, but they never touched the CPU interface.

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themike's picture
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Thanks

Thanks for the help, however I am pretty sure that mine has got a very dead power supply... I will just have to try this hack and see what happens Laughing out loud

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