One dead iMac G3 - WHY?!

jmima

macrumors newbie
Original poster
Apr 14, 2005
5
0
I have a bondi blue iMac G3 233MHz/B and it seems to have 'died'. When I push the button to switch it on, it starts to boot up but just as the button turns from orange to green and the oint where the screen would normally light up, it conks out. After that, if I try to switch it on again, nothing happens. I have to leave it for an hour or so before it'll just do the same thing. Someone suggested it might be the Lythium battery so replaced that but it hasn't worked. Now someone else thinks it might be the power supply unit - an expensive item to buy if that's not the problem! Can anyone shed anymore light on this? :confused:
 

Chappers

macrumors 68020
Aug 12, 2003
2,247
1
At home
This could be the analogue card - the bit that translates stuff the the screen. This common failure on the original iMacs is expensive to replace. Hopefully you have backed up your data.

What version of macos are you using? 8, 9 or X ?
 
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jmima

macrumors newbie
Original poster
Apr 14, 2005
5
0
No - I have lots of things on it that I hope I can recover. Is it possible, do you think? Can the memory be transfered to a similar computer so that data can be burned onto disk?
 
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Chappers

macrumors 68020
Aug 12, 2003
2,247
1
At home
I'm also remembering there used to be a problem with the power switch on the iMac - have you tried the 'on' button on the keyboard?
 
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ryan42

macrumors 6502
Dec 3, 2003
299
0
Near Houston, TX
This is a problem with the flyback transformer that is known to fail in the older iMacs in time.
You probably experiance something simiar to http://www.digitalconnection.com/products/video/kdmfhdmi.asp

"After about ten seconds the power button light turns to green and immediately the computer turns off (probably accompanied by a “zap” sound from within). Typically the computer will not even begin to power up again unless you have let it sit for a while, at which point the same thing happens when you try to start it up again. If you open up the underside and disconnect the video cable, the computer will boot and operate normally (assuming nothing else it wrong with it) and you can actually use the iMac with an external monitor."

You may want to try opening the underside and disconnecting the internal monitor just to see if it works. It uses the same technology as teh old DB-15 apple displays. Just be careful around CRTs. They have the power to kill -- even after being unplugged for years. Source of information:
http://www.macopz.com/columns/imacrepair/
 
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e²Studios

macrumors 68020
Apr 12, 2005
2,104
5
I have a iMac G3 500 DV SE and the same sort of thing happend. I would hit the power button it would turn green, no display at all would come up then it would switch off. When i took it in for repair (at the time the only local repair shop was CompUSA) they wanted to blame first the logi board/video bard, then the display, then after all that they replaced the power supply and all worked well. What it seemed like to me was the power supple went out and idnt have sufcient output to power up the whole unit so it just shuts down. Luckily at the time i still had apple care on the iMac, but im sure replacing a power supply is cheaper than buying a new system :) Check ebay i would bet people are selling them for cheaper than apple will sell it to you for. Also be carefull around the CRT, they hold a lot of power even when there is no current runing through it, either discharge the CRT or be really carefull around it :) good luck!

Ed
 
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Norouzi

macrumors 6502
Aug 6, 2004
395
14
Philadelphia, PA
I saw this exact problem on a lot of iMac's, weather it was the original Bondi, the 5 flavore, or any of the slot loading iMac's. The difference is, on the Bondi iMac's the Analog board and Power Supply were two completly different boards. On you Bondi this is most likely what is wrong, I believe it was about a 150 - 200 dollar repair back in '03, not sure what it is now. I'd call your local Apple store and see what replacing the Analog board would cost. Might not be too much now. They might have a used one as well, I know we used to strip old machines that people gave to us to be trashed and used the parts we were able to pull.

EDIT: I would not recomend replacing the analog board yourself unless you know how to discharge the CRT, or have the complete take apart for the Bondi iMac which will tell you how to do it.
 
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