The internal earpiece (top speaker) allows you to hear the person you are talking to. It needs to be replaced on Samsung S9 / S10e / S10+ / S10 5G / S20+ / S20 Ultra / Note 10 if it crackles or no longer emits any sound.
This internal earpiece (top speaker) generates the sound of the person you are talking to during a call.
Here are some signs that indicate it needs to be replaced:
Replacement is very simple and takes about 15 minutes; no repair knowledge is necessary.