Problem with Imac G5

March 27, 2010 at 14:47:15
Specs: N/A
A week ago my Imac just started turning off spontaneously (while I was working on it) It will restart up but dies after a minute now. I had the logic board replaced 10 months ago. Same symptoms so has it gone bad again or could it be the power supply? It has been used daily for 5 years now

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March 30, 2010 at 12:29:43
The entire iMac G5 line suffers form the leaky capacitors defect. What apple does is they take in your malfunctioning unit, and replace the board with known defective NOS boards. The replacement's will last a few months to a year or two, but when the caps dry out or pop, the machine will no longer function again. Apple gambled that their defective replacement boards would last until the end of the recall time frame and then they wouldn't have to replace them out of warranty for free anymore.

If you want the problem solved permanently, YOU will have to purchase the 20 or so replacement capacitors and re-solder all of them yourself. I've brought back a few boards this way and not a one has had a repeat failure. Just remember the computer industry switched to lead-less solder a few years ago and it is a pain in the AS$ to remove those caps with anything less than a 40watt iron. Another important thing to remember is to purchase hi-temp caps that have a long advertised life time, not the cheap ones apple used. here's the link:

I'd say about 3/4 of all iMac G5 failures are from caps failing.

PowerMac 9600(1 ghz G4)
512mb RAM
50gb SCSI
ATi 9200 PCI

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June 30, 2010 at 20:45:03
That same thing happend to a G5 at my school and the logic board and power supply had to be replaced.

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July 4, 2010 at 14:49:02
Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:

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