5116 Views 8 Replies Latest reply: Mar 9, 2009 3:12 PM by MGW
I just removed my power supply and received good guidance from JimWarholic.com. who referred me to this Apple article on PSU replacement:
Here is a suggested source for the 661-3350 power supply:
My G5 1.8 iMac (1st gen)lost it's first power supply at fourteen months. The replacement burnt out recently due to (at least) swollen (defective) capacitors.
So it's somewhat uncertain if your replacement unit will again give up the ghost prematurely. The power supplies I've researched only have a three month guarantee. You can change the PSU without any trouble. But while you have the back cover off, look carefully at the Logic board to check for abnormalities (as in swollen or leaking capacitors (of which there are 25 in plain sight):
Thanks for the info Alex. I'll definitely use it for my reference. My original power supply died at about 14 months too! So this will be the 2nd time being replaced. The apple tech was a good guy today and he looked inside to make sure the capacitors looked ok and weren't bulging, for me.
What?! I didn't notice the 3 month guarantee on any I looked at, but then again, I didn't really look for a guarantee! If I can get the PSU unplugged then I think I'll be in good shape, that's the part that worries me the most. That it'll be tight and I'll be afraid to pull it apart to hard. We'll see.
As long as the "key" or lock tab on the wiring harness joint is pryed up far enough, you'll be able to force the connection apart by inserting the flat blade of a small screwdriver between the two halves and twisting. Work your way around (there is only that one lock tab). The halves will separate grudgingly, but incrementally without undue force.
In fact, start with the twist action until the lock tab is tight. Then pry it up and continue. Worked for me.
Whoo Hoo! Can you hear me cheering?!?! I did it and it actually works!!! If I can do it, ANYONE can!
Had a slight issue with the center screw that holds the power supply to the imac frame. I couldn't for the life of me figure out why it wouldn't come loose. (It was at this point that I was starting to get a little nervous!) I think you have to screw it "tight" to actually retract the screw from the power supply. Looked like a clamp type apparatus was there that works to hold the back panel to the frame AND the power supply in place. There was a tiny bolt that was glued to the end of that screw that broke off with all my screwing left and then right trying to figure it out. I don't think that will cause any issues (I hope). I think that was just used as a pressure screw on the power supply as there is no hole for it to actually screw into.
I also think I may have received a used power supply. It had marks in areas that looked like it had been removed from a previous computer. I am going to check applepalace.com's site to see as I didn't notice any information about warranty, as mentioned here. There is a date on the back of the power supplies, the dead one says B0606, I think the new one said B0505.
Thanks for the word of encouragement, it was really so easy!