Repair Sound Missing During Phone Call For iPhone XS, Microphone + Loudspeaker + Earspeaker Fix

In repair experience, sometimes we meet iPhone problem like this: all sounds works normally when we test them on the setting page, but when we make phone calls, we can’t hear earspeaker and loudspeaker, meanwhile microphone stop working.
In this case, how should we locate the problem reason, and how to solve it?
Follow us to figure it out with this video.
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