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.

Comments

Popular posts from this blog

First Hawaii, then Oregon

Why? Hawaii - the international conference on MR (ISMRM) happened to be in Honolulu in 2017. Oregon - to counterbalance volcanic islands with sunny beaches and volcanic mountain with snow.

Part One: No Glamping in Hawaiian Islands

Island One: Kauai



After comfy 24-hour economy flights with Eva and Fabian, and just as I started to watch Moana, we landed in Lihue (Kauai). I assembled with Pedro, we took a rental car and quickly found our room in cosy Kauai Palms Hotel. For lunch next day we met Andrea in Kapaa and together we headed to see Wailua Falls, not far from Lihue. We left Andrea in Kapaa later that day and for our next night we were going to camp at Koke'e State Park Campground (thanks Evka for help with fixing my tent!). The night was very cold, roosters were loud and views from Kalalau Lookout were astonishing! It was time to warm up and see some beach so we decided to get a nice cup of coffee and visit a beach with restricted access for rental cars - Barking Sands Beach in 

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!

Inspiring music in Casey Neistat's vlogs

After watching a few vlogs by Casey Neistat on Youtube, I couldn't help notice the well-chosen music in the background. Particularly music by one artist named Julian Avila. Here is his music: https://soundcloud.com/julian_avila
Inspired, I took several months old videos I shot on GoPro Hero 2 when I was biking to Kahlenberg in the rain. After a few hours and two whiskeys, this came from my computer: