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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Mac Motherboard Fuses different colours

Does anybody know the reason that some fuses on the Mac motherboards are marked with an N and some with a P - please?

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They are different devices used on a logic board: a shorting bar is not the same as a fuse.

A shorting bar (5 Amp fuse or higher) is not designed to limit the current flow whereas a fuse is!

If you remember the old screw-in fuse panels in houses had. Some people would shove a penny or other metal slug into the socket to replace the fuse as they either where overloading the circuit or just didn’t have a fuse at hand to replace the one that burnt. This is one of the causes of house fires!

So don’t cheat! You could put your self and/or your computer at risk! Use the proper fuse link where its needed and don’t use solder or use a shorting bar as a fuse! Review the schematics for the correct rating needed.


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What great answer... thank you!!!!


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Austen Lennon será eternamente grato(a).
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