iMac G4 (flat panel) logic board - what to do with it

10 replies [Last post]
iantm's picture
Offline
Joined: Apr 2 2005
Posts: 709

I have a 700 mhz iMac G4 logic board with a bad ethernet port (but have an airport card to use instead. The Slot Load iMac G3 -> ATX hack thread reminded me that I have this board. Has anyone tried to build a machine around the board alone? I have just the logic board, airport card, and nothing else. I'm thinking of adapting it to work in a different series machine's case. Since the board is a circle, it's not going to be an easy fit into anything, but should make for an insteresting hack. Any ideas are more than welcome.

__________________

- iantm
ACPT & ACDT (long expired)
BMW Certified Technician

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Jon's picture
Jon
Offline
Joined: Dec 20 2003
Posts: 2804
I'd vote for shoving it into

I'd vote for shoving it into a pizza box/feets Mac. If you can find a nice slim power supply, ad could hack the floppy slot for an optical it might make a nice hack.

__________________

I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

Offline
Joined: Feb 7 2005
Posts: 2
round tin

Do you have any decorative round tins that such as candies or cookies came in? That would make an interesting housing if a compatable size. or the bottom of an inverted mesh trash can.....

macintoshme's picture
Offline
Joined: Sep 20 2004
Posts: 150
Popcorn Tin

Get one of thos lage popcorn tins, get 4 of those logic boards, and hook up an X-Grid in it using FireWire. If one of the 4 or 5 logic boards has a good ethernet, just bridge the network.

__________________

MacBook 1.83 GHz, 2GB, 60GB Mac OS X 10.6; PowerMacintosh G4 (Quicksilver) 733Mhz, 1.5GB, 160GB, Mac OS X Server 10.5, Mac OS 9.2.2

Offline
Joined: Sep 21 2004
Posts: 74
That would make

an intereting media center box. Slap that thing into the back of your tv, and run the video out to svideo or something along those lines.

Offline
Joined: Feb 5 2006
Posts: 36
LC Case

In 2001, someone asked me what I thought the flat panel iMac rumored out would look like. Back then I still had a Mac LC on my desk, and I drew a picture. It was the size of an LC on the bottom (the base), and had a display that was integrated and swiveled (not on a big rod like the iMac has but instead on a tilt/swivel stand like most regular monitors). Today an iMac sits where that LC once was.

Use the MIni VGA out to connect any monitor you want to it, although I personally love the iMac's display.

__________________

Classic Macs = Vintage Casual Luxury

eeun's picture
Offline
Joined: Dec 19 2003
Posts: 1891
I was asking around about a d

I was asking around about a dead slot-load iMac at my usual salvage locale, thinking some of the cables might be useful for my previously mentioned iMac to ATX conversion, and I was directed instead to a 15" LCD iMac with unknown problems. In many pieces. Free.

So, after a couple days of piecing together what I vote to be Most Tightly Packed Macintosh Ever, I now have a headless 800MHz G4 iMac in my desk.

Aside from putting it back together, I had to put a different power connector on the back, as no one I know had an iMac power cord. Only issue it's show so far is the 256 MB Kingston SODIMM only shows up as 128 MB.

iantm, let me know if you need pinouts for the PSU connector. I've also got the speaker and fan power/sense line from the LCD ribbon connector.

__________________

"Give a man a fire, he's warm for a day. Set a man on fire and he's warm for the rest of his life."
(Terry Pratchett)

eeun's picture
Offline
Joined: Dec 19 2003
Posts: 1891
Replying to my own post...tha

Replying to my own post...that's just wrong.

I've got another 15" iMac G4, and it's got serious crashing issues. The motherboard has apparently been replaced once or more, so I'm guessing PSU.
What I want to do is connect it to an external PSU.
The pinouts on the power connector are very simple: There's a row of 12V lines, a row of grounds, a single 3.3V line, then four wires that go to the HD/CD connectors.

The weird thing is the PSU seems to be in an always on state. Excluding the HD/CD lines, the 12V and 3.3V lines are always on. When the power button is pressed, power is then directed to the HD/CD lines and the rest of the motherboard, LCD, etc.

I'm at a loss to how I should handle connecting an external power supply, since the motherboard replaces the soft-on portion of an ATX PSU.

Best solution I can see so far is to use an AT PSU, but that would require a two-step power on and off.

Still in preliminary planning, but I'd appreciate input.

__________________

"Give a man a fire, he's warm for a day. Set a man on fire and he's warm for the rest of his life."
(Terry Pratchett)

Offline
Joined: Mar 5 2006
Posts: 2
the i of the o

i'm off to pick up a dead g4 imac.
i'm buying it for the airport card , ram, hard drive and....
some kind of hack for the display.

this is pretty much "minute number one" in terms of how much i've looked into it.
i'll be back i'm sure. research. searches. you guys know the drill.
wish me luck.
pea

Offline
Joined: Mar 5 2006
Posts: 2
re: always on.

make sure you have the switch that came with the imac.
that's pretty much rule of thumb.
in many cases the switch are very specific.
by switch i mean the "power" or "on" button.
extend the wires if you must but make sure you've got all the ducks
where they go.

p

Eudimorphodon's picture
Offline
Joined: Dec 21 2003
Posts: 1203
Re: Replying to my own post...tha

eeun wrote:

Best solution I can see so far is to use an AT PSU, but that would require a two-step power on and off.

Just to note, AT power supplies don't have a 3.3v output. That's strange that the motherboard takes 12v and 3.3v, but no 5 volt. (Or maybe it isn't, come to think about it. Technology marches on.)

--Peace