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[Build Log] iMac Lampshade Retrofit - Page 2

post #11 of 24
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post #12 of 24
Thread Starter 
Quote:
Originally Posted by iWinger View Post

Here is a sandy bridge all in one retrofit of a 20" iMac g4 with lion hackintosh with videos sang guide. There is a guide for two versions of the 17" iMac g4, but only the pin out for the 15". The tricky part is the display but there are step by step guides and parts lists
http://www.dremeljunkie.com/2012/01/20-imac-g4-all-in-one-genuine-sandy.html
http://www.dremeljunkie.com/2011/11/all-in-one-20-imac-g4-genuine-tmds-to.html
On TonyMac:
http://legacy.tonymacx86.com/viewtopic.php?f=76&t=42147&start=20

Thanks for the info! + REP for you, and welcome to OCN!
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post #13 of 24
how come you have 5 rep but 6 unique? can you de-rep people?
 
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Pur Esprit
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post #14 of 24
I had totally forgotten about the Lampshade Mac, wow. That is one interesting "case" to work in.
post #15 of 24
Thread Starter 
Quote:
Originally Posted by barkinos98 View Post

how come you have 5 rep but 6 unique? can you de-rep people?

Haha I really don't know! I didn't notice it until you pointed it out. Maybe if an admin sees this they could chime in? My rep page shows 6 links to 6 reps.
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post #16 of 24
Thread Starter 
Some research

Dremel Junkie's blog posts about using an ECX size motherboard, specifically the KEEX-6100 Which is only 146 x 105 mm. Certainly smaller than a mini ITX board, but lacks the a full size PCIE slot, and must use a mobile processor.

Speaking of Mini ITX boards, one might not even fit within the iMac... the Mini ITX standard is 6.7" x 6.7" which gives a diagonal of 9.4 inches. I don't have the ability to measure right now, but it doesn't good. There may be some chance if I remove the corners of a Mini-ITX board where the bolt holes are. There shouldn't be any traces running around the outside of them. I'd really like to stick with Mini-ITX so I have the flexibility to use whatever hardware I want.

There is a Nano-ITX spec, but at 120x120mm it is hardly any bigger than the ECX, and seems to only offer embedded Atom based processors

EDIT: Just bought this beauty on ebay!

Don't worry, this actually wont be powering the iMac! I got it for $20 to test fit.
Edited by eovnu87435ds - 8/21/12 at 8:47am
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post #17 of 24


20" iMac G4 with mobile core i5 sandy bridge ecx board identified by lion as a macbook pro.

A mini itx will "sort of" fit. If you put it an an angle to the posts or use a metal saw to remove one of the posts, you can get it in there. Depending on your motherboard some or all of the ports may be blocked. But heat and power are an even bigger issue. The original iMac G4 was convection cooled, so the parts literally stacked on top of each other. There is less than 2" from the bottom of the drive to the bottom plate. So the optical drive can not fit. But even if you remove it, you still need the PSU,the HDD, wire, ?a graphics card, wifi, bluetooth modules etc. The only place a mini itx can fit is in the very bottom. So all that stuff would sit above it blocking the few air holes in the steel faraday cage at the top of the dome. While a low power atom or APU may work, anything else will run very hot. Ive tried it. The smaller ECX board (designed to be the size of a 3.5" drive) sits above the optical drive (replacing the original 3.5" HDD) right under the air holes and fan. Nano itx and Pico itx boards run low power processors (ex atom) but ive never seen a sandy bridge/ivy bridge variant yet, but these would be fine choices as well. For perspective this is what the 6.5" x 6.5" x 2" old mac mini (mini itx is 6.7" x 6.7" and a "low profile" atx heatsink is 75mm or 2.95" high alone):



Also remember room for ports.

Power is also a problem. Dremeljunkie.com has instructions on use of the original 17" and 20" PSUs. The ECX board uses a mobile core i/sandy bridge processor which is the same one in the sandy bridge mac minis and macbook pros/airs. There are advantages to mobile processors as it is smaller, cooler, and more power friendly (many all in ones use mobile/notebook parts). Also, the lack of a full pci-e slot isnt a huge loss as there really arent many boards that would fit and that can be powered. There is a pci-e mini slot. No atx power source will fit and pico psu's (which have external power bricks) really top out around 150 - 160 watts. The original 20" psu had 190 watts. Given that you are powering an lcd with ccfl backlights, you should target a system that consumes no more than 100 - 120 watts without peripherals. This doesn't leave much. If you are going to keep a large full atx PSU external, you may want to consider keeping the computer external so you aren't held to these limitations. The base could still be used as a USB hub or to hold an "internal" optical drive. Here is a 20" iMac G4 and 20" iMac G5 converted to external monitors via HDMI and DVI for a new generation mac mini. The iMac G4's base contains the power brick and an optical DVD writer (useful as apple didn't even make in an option for the new mini) and the iMac G5 has the iSight converted to USB.



If changing lcds just remember the 17" and 20" use the currently uncommon 16:10 ratio. The 15" I believe is 4:3.

Certainly do not want to discourage anyone and anything is possible, but I helped with some of these mods and have seen these problems arise. Consider smaller form factors, mobile processors, or even using the mac mini as an external monitor connected via DVI.
post #18 of 24
Maybe you can put my idea to work. About 5-6 years ago I thought about doing the same thing to my stepdads mac. (same model)
     
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post #19 of 24
Thread Starter 
@iWinger
Hopefully I can get the Mini-ITX mobo that I ordered to fit, but it is good to know that a mac mini has been fit inside one. I do have to agree with you that cooling is certainly the biggest issue behind fitting everything. I really want to use something sandy/ivy bridge, especially for the point that you brought up, how it uses current mac hardware. I want to dual-boot Windows and OS X, so being able to use a vanilla kernel would be a nice perk. As for power, I am not against having a large power brick sit outside of the case and provide a massive 12v rail inside. In fact, I already have several power supplies capable of outputting 80+ amps @ 12v (constant). Doing that will save me much space for either more components or more airflow. If I can't necessarily fit a cooling system for the processor, I may look into somehow implementing heat pipes. If I use the ECX board with a mobile processor, it would be pretty easy for me to find some cooling components from a laptop using that processor, as they would have nice long heat pipes, and are already compatible with the socket and hold downs.

EDIT: Actually, Newark sells Heat Pipes!


Edited by eovnu87435ds - 8/22/12 at 7:50am
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post #20 of 24
Thread Starter 
The Fittings, Part 1

Today my for-fitting Mini ITX motherboard arrived! I was a little busy, but I was able to do a quick check on how things might fit. Turns out, if the board is rotated 45 degrees, it fits no problem! It's also fine that the ports don't line up because I plan on de-soldering those ports and using the original iMac ones which will be fixed in place.

Here it is fitting! I may have to do something to ensure the stock ports will fit, but hopefully not much.
IMG_8984.JPG

And here is a shot of the inside with the top on. The top is currently sitting square on the base, as if it were bolted together. as luck has it, it all fits!
IMG_8989.JPG

I will probably use some standoffs to raise the board high enough that the stock ports will fit underneath the board. Not exactly sure yet, but as always, stay tuned for updates!
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