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You are not logged in. [Log In] AppleCentral » Forums » Mods and Hacks » Desktop Mods » G4 question
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#472750 - 07/10/07 01:10 AM G4 question [Re: Anonymous]
TCPMeta Offline
MacModder

Registered: 11/16/07
Posts: 1816
Loc: Florida, USA
I have a digital audio im trying to get working again. I think the CPU is dead but to make sure will the system power up with out a CPU? As in just enough for the power supply to kick on?
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#472751 - 07/10/07 07:00 AM Re: G4 question [Re: Anonymous]
Waragainstsleep Offline


Registered: 02/13/05
Posts: 1723
I believe not. But I could be wrong.

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#472752 - 07/10/07 04:38 PM Re: G4 question [Re: Anonymous]
RedDrag0n Offline


Registered: 07/31/04
Posts: 102
Loc: Canada
The G4 will not power on without a CPU. The best thing to do is to test the power supply by itself. Take a small piece of wire and jumper it from the green wire (power on) and a black wire (ground). That will make the power supply kick start without being plugged into the motherboard. But you have to have the power supply plugged into the wall outlet of course.
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#472753 - 07/10/07 09:51 PM Re: G4 question [Re: Anonymous]
TCPMeta Offline
MacModder

Registered: 11/16/07
Posts: 1816
Loc: Florida, USA
I know that much of to test a power supply. Guess my CPU is dead or the motherboard is dead. If I can locate a different motherboard I can find out for sure.

Wait a sec, a digital audio CPU can work on a sawtooth logicboard but I would have to cut off the pins to the second IDE channel right?
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#472754 - 07/10/07 11:30 PM Re: G4 question [Re: Anonymous]
RedDrag0n Offline


Registered: 07/31/04
Posts: 102
Loc: Canada
Depends on the cpu. I have a 466 DA cpu set to 550 for a Sawtooth and i didn't have to take off the second IDE. Any single DA cpu's will work in a Sawtooth, they just need to be jumpered for the right speed setting.
(ex 466 DA CPU would be 350 in a Sawtooth)
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#472755 - 07/10/07 11:48 PM Re: G4 question [Re: Anonymous]
RedDrag0n Offline


Registered: 07/31/04
Posts: 102
Loc: Canada
Here is a chart comparing the Sawtooth cpu's and the Digital Audio cpu's for jumper settings. The red highlighted part is where they differ in jumper speeds.
Jumper settings
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#472756 - 07/10/07 11:57 PM Re: G4 question [Re: Anonymous]
TCPMeta Offline
MacModder

Registered: 11/16/07
Posts: 1816
Loc: Florida, USA
I tried the CPU with the sawtooth logicboard and it won't connect right unless the IDE controller is out of the way.

Great tip though for the CPU speed settings.
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#472757 - 07/11/07 12:46 AM Re: G4 question [Re: Anonymous]
RedDrag0n Offline


Registered: 07/31/04
Posts: 102
Loc: Canada
Ok, so by the sounds of it, you have one of the following...
Either a 667, a 733 or a dual 533 cpu from a Digital Audio. In that case, yes, you need to remove the second IDE connector and use an IDE card.
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#472758 - 07/11/07 11:12 AM Re: G4 question [Re: Anonymous]
TCPMeta Offline
MacModder

Registered: 11/16/07
Posts: 1816
Loc: Florida, USA
I got the 733MHz CPU module. I went ahead and bit the bullet and chopped off the pins to the 2nd IDE channel and it doesn't work. No power will go to the system. I have checked the power supply 3 times and it works fine with my tester, even work on the sawtooth with the 400MHz CPU. So I guess I have a dead CPU.

Would a sawtooth CPU work on a DA or not. I know the DA uses a 133MHz FSB and the Sawtooth uses a 100MHz FSB.
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#472759 - 07/11/07 10:54 PM Re: G4 question [Re: Anonymous]
RedDrag0n Offline


Registered: 07/31/04
Posts: 102
Loc: Canada
It might, but be careful not to fry the cpu. You might have to down clock it a bit. A 450 might run at 600MHz without modifications but i would check it all first to be on the safe side.

*Do this at your own risk*
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