Re: imac G5 psu component level question/challenge.
Well as best I could tell, what was meant by "jump" was 15 to ground so I used a snipped cap leg to bridge it - held my breath and plugged her in: no smoke and flames. My test results were normal except pin 4,6,20 and 21 read as 5v rather than 5.1v and pin 22 looked closer to 26v than 24. Are these variations normal/to be expected?
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Re: imac G5 psu component level question/challenge.
I put in the diode and new caps on the power supply last night. But I would like to test it before hooking the mother board to it. I have a pin read-out diagram for the unit that I found. I did a search on this forum and there was some talk of using a jumper (jumper the plug)? but I couldn't find anything specific on what was meant by this. I just want to do the right thing before I plug it in - any help kicking me in the right direction would be appreciated.
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Re: imac G5 psu component level question/challenge.
This may be a silly question but I don't know much about diodes. When I looked up 1N4728A at Mouser I noticed that the zener current varies by component. Some are listed as 76 mA while others as .2A and yet others as 276 mA. Which of these would be preferable, if any?
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Re: imac G5 psu component level question/challenge.
Thanks Toasty!
A few follow up Questions:
I heard somewhere that one should get something called a "temperature
compensated" diode for the purpose served here. Is there anything to
this?
Further, As with capacitors some brands are favored while others
are advised to be avoided. So with diodes, are any particular brands recommended over others? - any brands to especially avoid?
And finally any recommended places to purchase? Thanks.
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Re: imac G5 psu component level question/challenge.
Ok. Here's a few pics, though I doubt they will be very helpful. The first (zd4) is one I took with the camera on my laptop. The second is the best picture I could find on the internet - and I made some marks pointing to the component. I used a magnifying glass to look closely at the component beneath a good light but I couldn't read anything besides the ZD4 printed on the board itself. The model is iMac G5 17" 1.6g Rev A....
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imac G5 psu component level question/challenge.
I was hoping to help my friend repair her iMac G5 17" 1.6g Rev A computer by changing the caps in the Power Supply and Logic Board. But when removing the caps on the power Supply I noticed a broken zener diode and feel it may be useless to continue until I identify and change that component first. The diode in question is labeled ZD4 on the circuit board itself. (I have a picture but I'm not sure how to post it)
And while I was able to find an Apple service manual for the model online it is of little help in that it doesn't address component level repairs.
Would...
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