may i check the logic board using multimeter while it is still connected to the laptop and turned on?

kitt 01/18/2019

i want to check my macbook air because it is not powering up. i see a video here and the culprit is the f7140 fuse and it was changed. i want to check my logic board using multimeter just to check if the fuse is blown and check for 8.5V,. May i do this? also what is the usual cause of the fuse blowing out? i just left the charger on connected to my mac. what could be the problem? thanks.
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