iPhone 7P abnormal sound when using headphones

neive 02/25/2019

The sound can be really low when using headphones. I tried to replace the headphone with a new one and the problem remains the same. Loudspeaker sound is just fine.
Answers

REWA

02/28/2019

Checking U3101, it may be caused by pseudo soldered or damaged of U3101.
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