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Simple Power "Hack" Mac G4 (Sawtooth)

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Motherboard
Gigabyte Z590M GAMING X
CPU
i9-10900
Graphics
Vega 56+UHD 630
Mac
  1. MacBook Pro
  2. Mac Pro
Classic Mac
  1. Power Mac
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Thanks you so much! that’s great! But I dont have the original cable, so I will use jumper cables. Do you have the power board numbers and colors to make the conection after soldering like you do?
At the moment I can't, but at the end of the day here, after work I can check for you.
 
Joined
Sep 18, 2011
Messages
60
Motherboard
Gigabyte Z490m GamingX
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i5 10500
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RX460
Mac
  1. iMac
I'm working on a similar case, and using a similar method with my dremmel. I'll post pictures maybe when it's complete.
 
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Joined
Sep 10, 2017
Messages
320
Motherboard
Gigabyte Z590M GAMING X
CPU
i9-10900
Graphics
Vega 56+UHD 630
Mac
  1. MacBook Pro
  2. Mac Pro
Classic Mac
  1. Power Mac
Mobile Phone
  1. Android
  2. iOS
Joined
Sep 18, 2011
Messages
60
Motherboard
Gigabyte Z490m GamingX
CPU
i5 10500
Graphics
RX460
Mac
  1. iMac
At the moment I can't, but at the end of the day here, after work I can check for you.

The back end of the socket (not the side you plug into):

Top 1 3 5 7 9
Bottom 2 4 6 8 10


The front side of the socket (the side you plug the cable into):

Top 9 7 5 3 1
Bottom 10 8 6 4 2


------------

LiveSorcerer, thanks again! I did the method and it works. :clap: I have the following:

Top 9 (Power +) 7 (Power -) 5 3 (Reset +) 1 (n/a)
Bottom 10 (N/A*) 8 (N/A**) 6 4 (HD LED +) 2 (n/a***)


*10 makes the LED glow very dim. I don't know what that's for.
**It appears that both 7 and 8 are connected and are the common ground for the whole board.
***Doesn't appear to do anything - although I expect maybe it did on the G4.

On the original PowerMac G4, the power button would pulse when the computer was asleep, and would flicker when the hard drive was accessed. It was a nice effect. This setup won't provide that level of functionality; but, it will power on/off the PC, and the power light will glow when the computer is turned on, and will turn off when the computer is turned off.

One thing I found in the process of doing my own research is that the Power-switch board appeared to have one wire connected to constant power (like always on 5v USB). And I think it kept the power button active. So, when you pushed the power button, the chip inside was what sent the signal to turn on the computer. I think the chip also controlled the led (for sleep and hard drive activity). Maybe one day, someone will figure out how to add all of that functionality back. But, I'm glad to have something that works. Thanks again.
 
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