Skip to main content

iMac G3: Replacing logic board

Since I have bought my iMac I knew that it is not a very fast version. But because of availability of 350 MHz G3 CPU's I decided to buy this one and see how does it work. After a while there was one thing I didn't like. No FireWire means no Mac OS X Tiger. I used XPostFacto, but still it was not something I like.

I looked for many sites how to upgrade your old iMac. CPU upgrade is not reasonable these days - it is very expensive, you can buy a better machine for that price. So only option for me was to find a cheap logic board and replace the old one. I knew about the issues with incompatibility but I risked it. I found one logicboard in NYC. But after a few days, it was only 400 MHz instead of 600 Mhz and I didn't want so little increase of power. Then I found 500 Mhz G3 on eBay in Canada only for 35$.

My friend in the USA bought it for me and I waited until Christmas for this delivery. I was not sure if it will work but I wanted to risk it.
The most important thing for me was this iMac G3 Disassembly Guide. I followed the instructions and replaced the logicboard. It was not very complicated but you have to be careful with the screws. If some of them falls inside the case - then prepare for opening the whole case.

And that was my case. Replacing the logic board was not difficult, the most difficult in this process was bring it to life. The first problem was that the power button has been lit very low. Another thing that OS X was not booting. At first I thought the logicboard is broken or there is not enough power for this type or CPU was overheating.

The worst of all, I was ill that time and instead of lying in bed I was doing "devilry" with iMac. I replaced also HDD with my old DeskStar 120 GB. I formatted whole drive and tryied to install Mac OS 9 but without success.
After fifth time I was a bit desperate what to do next. I almost decided to install the old logic board and live with it like it was before but with OS X Panther.
But after one great SMS I decided to try it once more time. But this time, with the old logic board inside, I installed Mac OS X 10.3 and then replaced the new one. And ... it worked!

I was very surprised. I couldn't believe it. Everything worked perfectly and after a while I installed Mac OS X 10.4 finally. But my body temperature raised and I have finished installations later.

GeekBench score: 260

I can say it runs far more better with 500 Mhz CPU, it is possible to watch normal avi videos, browse the web with Safari 4 (playback of flash videos is still bad of course) and with new 7200 rpm hardrive booting time is shorter and work with files is improved. There is also possibility to install Airport card but I use only ethernet connection now.


Popular posts from this blog

Additional RAM to iMac and installation of some software and games

RAM upgrade

After Mac OS 9 updates I started to use this system. But after a short while I realized that I really need more RAM. It was almost impossible to work with more than one application. Therefore I was decided to buy 512 MB RAM.

I knew about one small shop with old computers on Favoritenstrasse (U6: between Taubstummengasse and Südtiroler Platz). I went there and asked about SDRAM PC100. Old but nice guy showed me some 512 MB modules for about 30 €. I didn't have so much money with me at that moment and I also wanted to visit that Mac shop once more. So I left the shop and forgot my umbrella there.

That Mac shop offered me the same kind of RAM for about 45-50 €. Hmm, .... No thanks. I went to my room and picked some money from bankomat. I returned to the computer shop and the seller offered me (except my umbrella - for free of course) one module for 24 €. It has not been tested yet. I have bought it and put in my iMac - and nothing happened. Bad, but I had to go to the school…

Windows 7 RC Ultimate on HP Compaq nx6110

I have never tried Vista on my laptop, because it is well suited for WinXP and I don't like Vista. But what if you can download the new Win 7 RC for free?

I'm using Windows XP since I have bought my old laptop HP Compaq nx6110 (1,4 Ghz Celeron M, 768 MB RAM). WinXP runs on this laptop really fast and smoothly, but I have turned every "eyecandy" off and it looks like old Win95 now. But I like this neutral look.

Last week I was closed in my room for two days installing and trying different Linux distributions. After this time I ended with Arch Linux installed on my hard drive - system was stable and either WiFi worked well. Then I realized, that I have spent so much time and done nothing useful. So I decided to work with WinXP and don't bother with other OS (like 2 weeks with Mac OS X a month ago).

But NO. Incidentally I got to this website and started immediately download the iso image. The download process ran in Java and I had download speed about 800 KB/s, that…

Yamaha S08 - sticky keys repair

My keyboard Yamaha S08 suffered from several "sticky keys" disease already a year, perhaps more. That saying, I am pretty bad piano player. However, I like to have my devices fully functional for any cases.
I have found a very helpful guide, but with no photos. I made some for better visualization of the repair.
First, I unfastened all screws from both sides:

Second, I unfastened all screws from a wooden base plate which were holding the part with electronics.

Then I unfastened the golden screws holding the whole keyboard to the wood. The keyboard was now accessible from both sides.

The last step is described in the following video. It was just removing the sticky keys and reinserting them without a metal spring coming inside. The end of the metal spring has been left outside of the key:

So far it works well!