MSI GP60 2QF Leopard Pro distorted sound

[ktmmotocross]

Hello.
Have this msi MS-16GH MSI GP60 2QF Leopard Pro gaming laptop that have weird sound. owner say he using much headphones jack

check audio attached

where to start finding fault?

[ktmmotocross]

Re: MSI GP60 2QF Leopard Pro distorted sound

on headphones sound is good, only on reproductors is bad

[SMDFlea]

Re: MSI GP60 2QF Leopard Pro distorted sound

Have you tried it with linux .If its only happening under win 8/10 try to reinstall the Soundblaster cinema,and EQ drivers

https://forum-en.msi.com/index.php?topic=289686.0
https://cdn.badcaps-static.com/pdfs/...68dba913c6.pdf

[ktmmotocross]

Re: MSI GP60 2QF Leopard Pro distorted sound

i try it with ububntu and works the same. i think it is in amplifier but need schematic to check that

[ktmmotocross]

Re: MSI GP60 2QF Leopard Pro distorted sound

i check amplifier. i have flicker voltage on input and output, but on ALC892 sound chip output lines is stable
VDD voltages on both chip is solid and ok

have u some hint how to check sound before it enters amplifier?

[KvnTM]

Re: MSI GP60 2QF Leopard Pro distorted sound

i check amplifier. i have flicker voltage on input and output, but on ALC892 sound chip output lines is stable
VDD voltages on both chip is solid and ok

have u some hint how to check sound before it enters amplifier?

Just play a 1khz square wave on the laptop and connect a scope to input and output. There are many programs that can do this.

[ktmmotocross]

Re: MSI GP60 2QF Leopard Pro distorted sound

i check input sound to amplifier with headphones and it is ok.
Amplifier is APA2031



BYPASS line have flicker voltage. what does this BYPASS signal?

[ktmmotocross]

Re: MSI GP60 2QF Leopard Pro distorted sound

from datasheet i see that bypass is just connected to capacitor, so i will order amplifier ic and replace it