Question Samsung Galaxy Note 4 no sounds

Aug 9, 2019
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Hi there !
I did today a motherboard replacement on my Samsung Galaxy Note 4. Everything went perfectly fine. But when I turned on the phone there was no sound, When I tried to volume up and volume down, the volume task apperd slowly and laggy. When I connected my earphones to the headphone jack phone didn't recognize them. When I tried to play video on youtube a error apperd saying "there was a problem while playing". I tried everything I found on internet, nothing worked. Any solutions ? Is this a hardware or a software problem ? Help.