Here's another question for the gurus out there. Where can I find Apple part numbers for components?? I Can't get anywhere on the support section of the Apple site.
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Mac part numbers
- Thread starter mac2geezer
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Others with more immediate knowledge may be able to add to or to contradict this observation, but, in general, Apple has always maintained two series of numbers:
1) those, generally of the 6nn-nnnn and 9nn-nnnn families, that are used by themselves (ie, by Apple) for inventory(?) and for order by AASPs, and
2) those of the 8nn-nnnn family screened onto boards and cards, or stamped into metal.
A part bearing the second kind was usually available to AASPs in a box with a number of the first kind. It is the first kind that figures (cough!) in the Service Source manuals, most of which can be found on line or purchased on CD from the back of a truck or on eBay. Is your question related to your other post about video parts? If so, the relevant SS Manual will give the numbers (in the exploded-view diagram at the end), but you probably will not be able to use them to get spares from Apple these days.
Why not post specifically what it is that you wish to know?
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1) those, generally of the 6nn-nnnn and 9nn-nnnn families, that are used by themselves (ie, by Apple) for inventory(?) and for order by AASPs, and
2) those of the 8nn-nnnn family screened onto boards and cards, or stamped into metal.
A part bearing the second kind was usually available to AASPs in a box with a number of the first kind. It is the first kind that figures (cough!) in the Service Source manuals, most of which can be found on line or purchased on CD from the back of a truck or on eBay. Is your question related to your other post about video parts? If so, the relevant SS Manual will give the numbers (in the exploded-view diagram at the end), but you probably will not be able to use them to get spares from Apple these days.
Why not post specifically what it is that you wish to know?
de
Well, I was looking for a MB on eBay and found some, but can't tell if they're for the 400 DV by the part numbers listed. Specifically, PN 820-1096A is advertised as a 400 MB, but no indication if it's for the 400 DV. So was trying to find some source of part numbers by machine model.
You may find it simpler to go by what is readily(?) accessible. Here you will find a listing of the 400MHz iMacs. Unless the video systems differ widely, the PAV boards may be expected to be readily interchangeable. The MLBs have little reason to differ widely, one might suppose. If you can find the parts you want with identical type numbers from other 400MHz iMacs, you should be safe enough to try the swapping.
In the swaps that you have already made you should have eliminated poor connectors/connections as the cause, but what of adventitious effects such as external EMFs, which can produce the colour effects that you noted, if not necessarily the same effects on geometry? Did you start up the mixed'n'matched iMacs in exactly the same location with exactly the same orientation? Or did you find the same behaviours in completely different locations? Were you careful to reset the PMU in each case, and ensure that the PRAM battery, which powers the PMU, was 3.3V or more? The PMU has to be reset carefully, or the battery life goes from years to days in a trice. The PMU is a computer-within-a-computer, with effects on much of what goes on in an iMac.
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In the swaps that you have already made you should have eliminated poor connectors/connections as the cause, but what of adventitious effects such as external EMFs, which can produce the colour effects that you noted, if not necessarily the same effects on geometry? Did you start up the mixed'n'matched iMacs in exactly the same location with exactly the same orientation? Or did you find the same behaviours in completely different locations? Were you careful to reset the PMU in each case, and ensure that the PRAM battery, which powers the PMU, was 3.3V or more? The PMU has to be reset carefully, or the battery life goes from years to days in a trice. The PMU is a computer-within-a-computer, with effects on much of what goes on in an iMac.
de
Don't have any idea what you mean by reset the PMU. How does one go about that? PRAM batteries were new.
The iMac displayed the same problem in two different locations in two different buildings, but the second machine was normal in the same locations. Should eliminate any EMI effects, plus we're out in the country away from most likely sources.
The iMac displayed the same problem in two different locations in two different buildings, but the second machine was normal in the same locations. Should eliminate any EMI effects, plus we're out in the country away from most likely sources.
The worst EMF effects come usually from sources immediately adjacent to the CRTs: fans, in-wall cables, microwave ovens, other CRTs, space heaters and the like, rather than overhead power lines and even more remote sources. The behaviours at different locations that you describe seem to rule local effects out. You've probably gone as far as you can with substitutions, and, if you have now isolated a prime suspect (board? yoke? gun?), you are left with a replacement of the offender.
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