Trouble shooting Speakers/Headphones

Hello

I have a problem with my portable N64.
The Speaker/Headphone makes some anoying sound when the normal sound of the game is off.
It is a buzzing/piping noise.
I tried some things to get rid of that noise.

I put my audio wires outside of the rf shield but it is already there.
What could i try to reduce the buzzing noise?

Here is a picture of the portable. (The picture was taken before i took the audio wires out of the RF shield)
f08db5.jpg
 
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