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Правка отклонена автор Evan Noronha

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[title] FAN TEST
[* black] WARNING: UNDER NO CIRCUMSTANCES SHOULD YOU TOUCH ANYTHING METAL INSIDE THE COMPUTER, OR THE LOGIC BOARD ITSELF, IF YOU BOOT THE COMPUTER UP IN A DISASSEMBLED STATE, EVEN IF THE POWER SOURCE IS ONLY FROM A BATTERY. I do NOT recommend that anyone does this unless its absolutely necessary in order to assist you to identify the cause of a faulty fan
[* black] Booting up the computer to test the fans whilst the laptop was disassembled was helpful in my case because this confirmed that the new left fan that had been installed was not faulty as I initially believed may be the case, and the fan test also established that there was a problem with the left fan connection plug on the logic board.
[* black] Once the cause of replacement left fan failure had been established, the computer was turned off and the left fan was reinstalled back into its correct location then another computer reboot confirmed that the fan failure fault still existed, which was the expected test outcome.
[* black] At this point, whilst the computer was still running I used the plastic spudger tool to apply increased pressure on the top of the left fan logic board connection plug, and to my relief the left fan started working immediately. However, the fan stopped working again as soon as the additional pressure being applied to the connection plug ceased.
[* black] This situation lead me to inspect the left fan connection plug on the logic board very closely using a magnifying glass, which revealed that the connection plug was very slightly distorted (i. e. not laying completely flat on the logic board) This was the problem that was preventing the left fan from working.
[* black] I suspect that the distortion to the logic board left fan connection plug was caused whilst the spudger tool was being used to remove the fan connection lead when the faulty fan was first removed. A very careful bit of prodding around using a magnifying glass, and the plastic spudger tool resolved the distortion issue.
[* black] When the left fan was plugged back in again it working immediately, without the need for any additional pressure being applied to the top of the logic board connection plug.
[* black] IMPORTANT: DONT FORGET TO CLEAN OUT THE CPU COOLING FAN GRILLS . Mine were partially blocked with nine years worth of black dust! When the computer was assembled it worked perfectly thanks to this excellent guide. The problem I encountered replacing the fan highlights the need to treat fan connection points on the logic board with the utmost care!