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700mhz eMac CPU Overclock

cueball said:
I compare it to the pictures posted here and everything looks right. It chimes, the light on the front comes on but then......nada. Anyone have any ideas?
Click to expand...

markdaman said:
hi people,

I have a big problem i done this mod and i put the computer back together. plugged her into the wall pushed the power button it starts up light comes on at the front etc it makes the sound but nothing comes up onto the screen? Whats going on?

Please can someone help?
Click to expand...

This usually indicates that your soldering is incomplete. The jumper isn't registering so the computer fails to start up. This is why the hard disk spins and you hear the chime, but the processor doesn't know what to do.

Resolder the jumper and you should be okay. Make sure that there's enough solder on both sides.
 
Jumpers...

Don't forget that the jumpers are nothing more than zero ohm resistors. You can use a solder bridge or a wire in place of the jumper. I have found that it is sometimes easer to work with a thin wire in an "L" shape so you have something to hold onto. Once soldered in place, trim the excess wire.
 
hey i want to increase the fsb of my second gen emac 1ghz is it possible? how do i do it?
i have changed the multiplier and also Vcore. wanted to stress the ram a get a bit more out of it, have sinks on them, and am liquid cooling the Cpu,

thanks
mohit
 
Request for info

Hi bigbadmac. I'd like the info on the old jumper block mod for the 700 emac

Thanks.
 
Jumper block mod...

thebob said:
Hi bigbadmac. I'd like the info on the old jumper block mod for the 700 emac

Thanks.
Click to expand...

Oie!! I'm realy truly trying to get all this good stuff put together on a website. If I could only clone myself about half a dozen times I could get evetything done! Anyway, check every other week or so at www.bigbadmac.com. I tend to get things done in spurts between projects...
 
I did the 700 to 900 overclock!!

It worked, I removed the three jumper resistors and Presto! is was a 900mhz machine.

While I had the machine open I did the following:
Replaced the HD with a 120GB Maxtor from BestBuy $70 (i could have found a better price but I had a gift card)
Replaced the CD-RW(non DVD) with a superdrive(DVD-RW/CD-RW) from Newegg $34

This machine now has life to last another year or so I'd bet.

I didnt take pictures, but I will answer any questions you guys post. Bigbadmac's info is invaluable. The eMac is not the easiest Mac tear down, but it is managable. Use the manuals linked to in this thread. Log your screws locations. And those jumpers ARE small. Since I only had to remove them, it wasn't so bad. But if your overclock requires soldering on a jumper, that would be harder.

Good luck to you.
 
Tried the overclock but......NO VIDEO

hi Guys
i am new to Forums.
Any way, i have tried to overclock my 700Mhz emac to 800 and 850 (another try) and both failed.:( I get the boot chime but there is no video image. I put the resistor back in place and it is back to 700Mhz and video all good. Why i get this i can't work it out. Any ideas????? please help.
Emac is 700Mhz, ATI graphics model.

thanks
p.)
 
Power problem with 700mhz

My 700mhz emac keeps shutting down, powering off, after running for a few minutes. It will power up, boot, and run properly then suddenly shut down like it has been unplugged. I have tried zapping the pram, unplugging it for over an hour, turning off energy saver and screen saver, etc. Anybody have any suggestions or ideas?
 
FireWire gone in my eMac 700

bigbadmac said:
Hi all! I've been getting quite a few emails and even a few phone calls about my old 700mhz overclock site. I sold Studio-Northwest.com and therefore no longer have the domain name that I was using for my hakz page.

However, I'm working on a new site for all you 700mhz eMac owners to visit. Until I get it up and running, I'll take Questions here and post the replies for all to see.

I'm going to post a few basics right up front to get you started. Best of luck to you all and stay tuned for the new site on its way.
Click to expand...

_________________________________

I'm new in this forum and I'm not sure if I'm in the right place; however i'll ask my question:

I have an eMac 700mhz (P69) with a Combo Pioneer drive, and an external FireWire hard drive. I bought them four years ago as an educator (as you remember, only educators were then privileged :)-) to get it with a Combo drive).

While I had to change the location of the computer, I disconnected the external hard drive from the computer, and when I tried to reconnected it, I did not look how I put the FW plug upside down in one of the FW sockets of the computer, thinking hat it can not enter wrongly, but it enterred quite EASY!
When I booted the Mac and switched on the FW drive it did not appeared on the display; then I found my mistake. After I put the plug right - the FW drive did not appeare either. When I checked the System Profiler it did not find the FireWire in the Computer ANYMORE! So I was left with the 12bit/s USB 1.1.

I asked the only Apple laboratory in Israel ("Yeda") to fix it - they said I have to replace the whole motherboard! The price they want is beyond my budget.
Is it possible to fix just the FireWire?

Reuven
 
It's possible but you would have to be pretty good with a soldering gun. In the end it's probably not worth fixing. If your determined though don't let me stop you.
 
Garrison Miller said:
My 700mhz emac keeps shutting down, powering off, after running for a few minutes. It will power up, boot, and run properly then suddenly shut down like it has been unplugged. I have tried zapping the pram, unplugging it for over an hour, turning off energy saver and screen saver, etc. Anybody have any suggestions or ideas?
Click to expand...

Sounds like a heat problem...no overclock is guaranteed, so it sounds like your chip just can't handle it.
 
I was wondering if any one could point me in the right direction. I've overclocked my emac to 900mhz but the problem is it won't boot. The fan turns on and you can hear it turn on for a second or two (I don't mean a start up chime) then it stops, the LED never comes on. If anyone knows what I may have messed up any help would be appreciated.
 
Leach said:
I was wondering if any one could point me in the right direction. I've overclocked my emac to 900mhz but the problem is it won't boot. The fan turns on and you can hear it turn on for a second or two (I don't mean a start up chime) then it stops, the LED never comes on. If anyone knows what I may have messed up any help would be appreciated.
Click to expand...

You pushed it too far. Either 1) It's not getting enough voltage (beyond your control). 2) The processor is just not capable of those speeds. 3) You fubared your processor.

Try it back at the stock speeds...if it doesn't work, you're likely SOL.
 
mmmcheese said:
You pushed it too far. Either 1) It's not getting enough voltage (beyond your control). 2) The processor is just not capable of those speeds. 3) You fubared your processor.

Try it back at the stock speeds...if it doesn't work, you're likely SOL.
Click to expand...

Thanks I'll try that
 
iMac

pouya099 said:
hi Guys
i am new to Forums.
Any way, i have tried to overclock my 700Mhz emac to 800 and 850 (another try) and both failed.:( I get the boot chime but there is no video image. I put the resistor back in place and it is back to 700Mhz and video all good. Why i get this i can't work it out. Any ideas????? please help.
Emac is 700Mhz, ATI graphics model.

thanks
p.)
Click to expand...

I have the same problem.:mad:

B.D
 
Video out Emac 700mhz

How do you get the video out to work on an Emac 700mhz
I have read that it will only work on an 800mhz

robbie
 
Just a note to say i've had a 1st generation 700Mhz eMac sitting in a closet for close to a year. It came in a lot of G4 'Yikes' and 'Sawtooth' computers i'd bought at a local school auction.

Of course, the analog board was dead, so I robbed the hard drive and RAM out of it to put in one of the 400MHz Sawtooth towers, and in the closet it remained until a few days ago when I was thinking i'd like to get a faster chip for my Sawtooth to put me in the 900Mhz range or so.

So armed with the info i'd gleened of the 'net both here and other places, i'm happy to report i'm now posting this message on that very same eMac, sprawled all over my desk!

Overclocked to 900Mhz and running cool as a cucumber. I'm powering the board with an old Compaq power supply I robbed out of a Pentium I desktop computer right thru the 'blind mate' port nearest the CPU, feeding it +5 and +12 volts from the Compaq PI supply.

For video, I chopped off one end of an old KVM cable and spliced it into the video connector right on the logic board and using a 17" Apple Studio Display for a monitor.. working perfectly at 1280x960 @ Mllions of colors running MacOSX 10.3.9 with 768MB RAM (1 512MB and 1 256MB stick)

Now i'm not speed freak.. I actually found the 400Mhz chip in the G4 Sawtooth to be just fine for web surfing, eMail, and coding, but when it came to using PhotoShop CS or Macromedia Flash MX it was just a little too chuggy for my tastes.. and was real close to buying a 900Mhz-ish 'QuickSilver' CPU to put in the Sawtooth.. but with eBay prices on those chips in the $100+ range, combined with the hassles of relocating the IDE port, or engineering a new heat sink seemed like too much time, money, and work.

So thanks to the folks who took the time and effort to chronicle their findings and pinout information here, for both the 'headless' mods, as well as the 1st gen overclock info.

I'll run this at 900Mhz for awhile and figure out what i'm going to do for a 'box', and might attempt to clock it a little higher in the future.. 1.2Ghz sure would be nice!
 
HI, am new to the forum, but read all the postings on this emac gen 1 overclocking upgrade. i have just performed this upgrade myself.

i have an emac 800 gen 1. after much trouble i have gotten it to 900mhz. 1ghz and 950 just seem to cause problems, not sure why exactly. anyways, the machine boots and loads osx fine. but i find it hangs a lot. the machine seemed slugish to begin with though. when the system hangs, i can still move my mouse around and it will eventually start working again. i just don't remember it being this bad at 800mhz.

i read about each chip being different and how one may be able to be overclocked to 1ghz, where for example mine is struggling with 900.

Now i am wondering if it is the overclocking causeing the hang or a bad hard drive. i remember using this emac at 800mhz when i first got it and thought wow, slow. mind you i have been on my macbook promost of the time. the system has 768 memory. I am also wondering how to understand the jumpersettings. i would like to try 867mhz before i try 850. just not sure how to do it.

thanks
 
I did it yestarday with my friend from work... Everything is just as you said. Unfortunatly it wasn't so easy to get my mac apart :) but we did it and my eMac G4 700 is now G4 900MHz. It's stable...


Many thanks, and good luck to the others :)

P.S. sorry for my english :)
 
Info...

netjosh_granada said:
I have a Gen1 700 Mhz GeForce2 MX eMac equipped with an 7455 G4 processor, and I've been able to overclock it up to 1.2 Ghz without any problem. I have not even needed to raise the CPU voltage. You just have to find the Motorola MPC7455 data sheet (pdf) and adjust the pinout to whichever speed your computer is stable.

I have to say that my eMac is less stable at 1.2 Ghz than before the speed bump, but I have lowered it's speed up to 1.1 Ghz and now it runs flawlessly.

If you have any question, just say it...
Click to expand...

Hi - do you have the detail of the jumper settings for the speed upgrade you have done?

Thanks - Smiddey:D
 
eMac 700 Video pin map

0010101 said:
i'm happy to report i'm now posting this message on that very same eMac, sprawled all over my desk!

I'm powering the board with an old Compaq power supply I robbed out of a Pentium I desktop computer right thru the 'blind mate' port nearest the CPU, feeding it +5 and +12 volts from the Compaq PI supply.

For video, I chopped off one end of an old KVM cable and spliced it into the video connector right on the logic board and using a 17" Apple Studio Display for a monitor.. working perfectly at 1280x960 @ Mllions of colors running MacOSX 10.3.9 with 768MB RAM (1 512MB and 1 256MB stick)
Click to expand...


Maybe I'm missing something but I still done see a (complete) map of the 700 MHz eMac video connector to a standard VGA connector. Can you explain which wires from your monitor cable you connected to which pins on the logic board connector to make it work?

And why doesn't it work to just use the video port right beside the ethernet port?
 
Thanks for the info. Works great.. Overclocked my 700 mhz to 900 mhz and it is running awesome. Now I am debating on upgrading to OS X leopard....
 
Upgrading to Lepoard after overclocking eMac 700

Does anyone have any feedback as to the experiences with eMac 700 overclocked 900mhz running Lepoard? Also has anyone added more than 1gig of ram to their eMac?
 
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