Re: imac g5 1.6ghz 17" power supply
Another member is also interested in getting the parts. I bought 10, used 2, and have 8 left. I was figuring on keeping another pair, and getting rid of 6, but if 2 of you guys want them, I might let all 8 go.
No, I haven't tried this PS in an iMac. This one came out of a friend's machine. I bought another PS, which worked fine after recapping, and gave the computer back to her. So presently I don't have an iMac to test it in. If I could be sure that this one is OK then I'd sell it on ebay, but I won't do that unless...
youfo
Member
Last Activity: 04-15-2014, 04:05 PM
Joined: 11-22-2009
Location: Delaware
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Re: imac g5 1.6ghz 17" power supply
I have some of the PHD101NQ 03LT MOSFET's available if anyone is interested. Just send me a PM by clicking on my member name on the left.Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
The 3.3V MOSFET's are PHD101NQ 03LT, same as the 12V ones. They seemed OK when I tested them before, but I'll check them again....Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
Success! Maybe.
The PHD101NQ O3LT'S arrived yesterday, and today I soldered a couple of them into the 12V circuit. Voila! All of the output voltages look good. I left the PS powered up for a few minutes, and nothing popped or smoked, so maybe it's good.
I keep saying "maybe" because I'm troubled by the burning around the 3.3V circuit. I mentioned this in an earlier post, and I think it's the same part of the board that Toast referred to in post #38.
Violating my usual safety concerns,...Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
The parts have not arrived yet. I'll post the results after I receive them.
Charlie...Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
Now that the tryptophan has worn off, I can type again. Turkey for dinner 3 days in a row, yikes.
I ordered 10 of the PHD101NQ03LT's from Newark/Farnell on Sunday. They are supposed to ship on 12/3. Directly from the UK on that date? Not sure.
I'll post the results after I receive the FET's and install a pair of them in the 12V section.
CharlieLeave a comment:
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Re: imac g5 1.6ghz 17" power supply
Using the VOM to test the FET's, as described in post #17, didn't work for me, even though my old Micronta (Radio Shack) VOM seems to have the right voltages on high and low scales. After turning them off as described, I saw near zero resistance Drain-to-Source on all the FET's, no matter the polarity of the leads. I must have done something wrong.
But while poking around with this, I found that one of the 12V FET's appears to be shorted between all of the terminals. I believe it's the same one that failed on Jon B's, the one...Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
Toasty,
After putting the PCB back in the case, I took some voltage readings at the connector, and they are similar to Jon B's.
With the AC connected, but the PS not jumpered on, I read:
4.97 V on Pin 9 (5Vsb)
4.74 V on Pin 15 (On/Off)
20.7 V on Pin 22 (24V ?)
After jumpering pin 15 to ground, pins 9 and 22 read the same as before, and there is nothing on the 3.3V, 5V or 12V lines. I didn't connect to the motherboard, but I believe the first LED was...Leave a comment:
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Re: imac g5 1.6ghz 17" power supply
Thanks for the warnings, but I have no intention of working on this PS "hot" with the board out of the case. If I want to measure the voltages on the outputs, I'll put the cover back on.
My skill level is moderate. I was trained in electronics in the Army, and worked as a telephone technician for 30 years. I'm comfortable working on low-voltage DC stuff, but am appropriately cautious around AC. I know very little about power supplies, but I have fooled around with the Voltage Regulator Modules, which also fail frequently,...Leave a comment:
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Similar supply in 20" G5 iMac
I have a dead power supply from a first generation 20" G5 iMac that appears to have the same circuit board as yours, with a few variations to accommodate the layout of the 20" versus the 17". The AC input connector, cap C1, fuse, and a few other components are moved to allow for the different placement of the AC power cord. Otherwise, they appear to be the same. The part number on my PS is 614-0297, while yours is 614-0294.
When I found out about the cap problem with these iMac supplies, I'd thought I'd try that fix....Leave a comment:
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