WHING~~~~ I hear a hum noise. [resolved]

[yoonbs]

Hello.
I assembled the S.E.X Kit a while ago.

I also assembled the CS42.
The resistance and voltage are within the range.

The sound is good.

However, a constant buzzing noise is heard.

A constant hum noise is heard regardless of the volume change.

I checked terminal 29 or 36, but they are not in contact with the nut.
Where should I check?

[AllenS]

Sorry to hear about troubles...
You don't mention if there is a source connected or if the buzz is in headphones or speakers.  Both?

Have you moved to another room and power source as a test against wifi interference?

[yoonbs]

Soldering again fixed the problem.
Thank you.