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Правка отклонена автор Evan Noronha

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[title] FAN TEST
[* black] I did not experience any obvious problems whilst replacing the left & right CPU fans, however after the fans were replaced with new ones & the computer was reassembled, when I booted the computer up to check the fans were functioning properly the third party fan control software I had installed indicated that the left fan wasn't working at all.
[* black] Upon discovering left fan failure I immediately commenced thinking that either the new left fan I had been supplied may potentially be faulty, or that the logic board may be faulty. NB: It is difficult to test new fans are working properly prior to installation which is the best scenario to reduce workload if a new fan is installed & it fails.
[* black] There is a video on youtube (https://www.youtube.com/watch?v=CmYE5Qtda2k) in which it is successfully establishes that a laptop CPU fan (similar to the fan needed for this repair) works correctly, simply by using a 9 volt battery. However note that the fan tested in the video is a type that only has 2 wires attached to plug into the logic board.
[* black] The fans Apple install in their MacBook Pro computers have 4 wire’s that attach to the logic board (the other two wires are for controlling fan speed apparently). I could not find a way to test if a fan with 4 wires is working correctly using a 9 volt battery so I had to commence the repair assuming that the new fan I was installing was working.
[* black] After discovering that the new left fan that had been installed was not working, I stripped the computer down again to remove the fan, and in order to establish if the problem was the fan or a logic board issue I decided to unplug the right fan connection lead from the logic board and then plugged the left fan into it for testing purposes.
[* black] In order to be able to boot the computer up whilst in disassembled condition it was necessary to reinstall the battery. I did not remove the ribbon connector that attaches the keyboard to the logic board throughout the repair process therefore the on/of power button on the keyboard was functional & enabled me to boot the computer to test the fan.
[* black] The boot up process confirmed that the left fan WAS working OK, & thus confirmed that there must be a problem with the left fan push on connection plug on the logic board. NB: It was not necessary to remove the right fan to test the left fan using the right fan connection plug on the logic board. I only unplugged the right fan from the logic board
[* black] Because the fan connection lead is short, there is no choice but to place the left fan on top of the logic board when using the right fan connection for testing purposes. However, I placed the plastic spudger tool underneath the fan to ensure that the metal case did not touch any logic board components when the computer was booted to test the fan