you try it AFTER you fix it so you don't fry anything.
just fix it FIRST and try it. if it doesn't work, you either resoldered it wrong or the fets are fried.
if it doesn't work and your connection is correct, you could have damaged them beyond function with the heat from your soldering iron.
you most likely will have to replace those fets.
and are you sure you put the fets in the right place? or if you got the correct fets to begin with?
just seems so much like you don't know squat about electronics. not to be intentionally offensive, but it seems that way to me.
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