s5 microphone problem only on call

hello everybody

i have with me a s5 900f with liquid damage.

everything works ok but microphone no at all…

i tried change charging port 3 times but same result.
i tried to resold dock connector on motherboard…still the same

so if somebody have any solution or schematics to follow i’m very happy because i don’t have idea and in this forum there are people with a lot of experience.

for any question or solution I’m in complete disposition

thanks so much!!!!:):):):)