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iMac G5 Power Supply
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Fresh-Faced Recruit
Join Date: Apr 2010
Status:
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I came home the other day and my iMac G5 1.8hz was off, and wouldn't come back on.
I'd hit the power button and the light would flash on, then off. I tried this multiple times, and then tried a new outlet, same thing.
I found on this site how to reset the PMU, so I held the power button down while I plugged the cord in the back of the computer. Nothing happened, expect, now when I hit the power button nothing happens (no flash from the power button).
I also found on this side how to do the LED test. I took the back off the computer, and when I put the plug in the outlet LED 1 quickly flashed and went off. The instructions said if LED 1 wasn't "ON", replace the power supply. I unplugged and plugged it up several times, and all of these times and didn't get any flashes from LED1 like the first time and the LED1 never came on again.
From this, I assume it is the power source. I had a few questions for some of the guru's on here:
1) Is it safe to assume it is only the power source that is damaged and not the logic board?
2) Any idea how much Apple charges to replace the power source?
I'm taking it in on Sundy to have them diagnose it for free. Hopefully if it's more than just the power source they'll be able to tell me.
They said they would not give me an estimate over the phone.
3) I found the manual on how to change the power supply yourself. It doesn't look that hard.
Does anyone know where to find a cheap power source, and what part # I need?
4) Any suggestions?
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Mac Elite
Join Date: Jun 2004
Location: Edmonton, AB
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As far as I know, apple is the only supplier of the power supply.
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Administrator  Join Date: May 2000
Location: California
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Online
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What is the screen size?
The power supply is only made by Apple, but you can buy it from a bunch of resellers. Typical cost is $100+, but the part number varies with screen size.
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Fresh-Faced Recruit
Join Date: Apr 2010
Status:
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Moderator  Join Date: Apr 2001
Location: Wasilla, Alaska
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If Apple will diagnose it for free, have them do that and then repair it yourself.
It's stupid easy to swap one of those power supplies.
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Administrator Join Date: May 2000
Location: California
Status:
Online
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Look for this part number: 661-3625
It might come with an Ambient Light Sensor board snapped onto it. For a pre-ALS iMac, you can unsnap that board and set it aside.
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Moderator  Join Date: Apr 2005
Location: Cambridge, UK
Status:
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It'd be worthwhile checking the capacitors on the logic board are all flat - not round and bulging.
They'd failed on mine, possibly caused the PSU to fail as well.
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Fresh-Faced Recruit
Join Date: Apr 2010
Status:
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Does the iMac 20" 1.8 and the iMac 20" 2.0 (ALS) use the same power suppy (661-3625)
Any suggestions on where to get a cheap (good) power supply?
I saw eBay has some for $60-90.
(Last edited by utseay; May 1, 2010 at 07:55 AM.
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Fresh-Faced Recruit
Join Date: Apr 2010
Status:
Offline
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Status: I took my iMac to the apple store today. They confirmed it was only the power supply. While I knew I could easily replace it myself for <$100, they said they had a power supply instock and their cost to replace it was $170. I didn't want to wait a week to receive one in the mail, so I let them do it.
I now I have a working iMac. Yay.
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