What can make a MacBook motherboard make a clicking sound???

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** Tools and equipment used in this video:
SOLDERING IRON - Hakko FX-951 - amzn.to/31kGDYG
HOT AIR REWORK STATION- Quick 861DW- bit.ly/3tW0Ikc
DC POWER SUPPLY - amzn.to/3u1b42u
MICROSCOPE- Amscope 7x-45x Simul-focal microscope - bit.ly/3coVCHc
ULTRASONIC CLEANER - Crest PowerSonic P500H-45. NOTE: There are many vendors that sell this cleaner. Do your research before purchasing.