4S Headphone jack not working properly - even after replacement

Hi all,
A friend of mine was going to throw their water damaged 64GB iPhone 4S away so I salvaged it.
The charger port had corroded (main cause for it not turning on - flat) so I replaced it along with the battery, headphone jack, and front glass/display. It basically works fine and feels like a new phone now.
One issue that persists is the headphone jack is outputting distorted noise when music etc is playing. I'd noticed this before replacing the jack and its replacement has made no difference. (Replaced jack which is attached to mute/vol keys and top mic - all else of which work.)
The louder you set the volume, the less 'resistance' the distortion seems to have and the music sounds clearer. At the low end of the volume scale there seems to be almost no 'low volume ability' on the phone, ie it's off (move the volume slider just off 0) > it's on and way louder than it should be (clear and fine for about 5 seconds and then distorted/off) > louder with less distortion (also seems to momentarily fix the issue at low volume when increased.)
I have run the music player all day at mid-high volume to see if it would sort itself out with no improvement or worsening. The earpiece, speaker, microphone, airplay, and all buttons are working as they should, it's just when using headphones do I get this crackling.
My thoughts are something is stuffed on the main logiboard, but I'm really hoping that may not be the case. Does anyone have any suggestions or ideas?
Thanks for reading : )
John

You need to visit a website such as iFixit with such a question.

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