hi to all!!i have a problem with an iphone 4…a speaker problem.when is playing music or someone calls.the sound becames very metalic ,pitched…
sometimes is working fine,sometimes not.i opened the phone.there is no water damages.
the phone seems to be brand new.
i have no clue about it….i would try to change charging flex and audio flex(with side buttons)…
when i press the socket of charging flex …the sound seems to be ok…

i wonder if is an audio ic or something like that?
please,any ideea?