Noise on headset after inserting into headphone jack?

Hello,

When i connect Headset to phone it gives some cracking noise and when i play songs headset's volume button and answer button also not working but it gives sound. at the same time if press near front camera or top side the cracking noise goes and after realizing pressure its again starts the cracking noise.

I replaced Headset jack and my cracked display but still its still continue.

i am finding mother board grounding point for one try but i am not getting.

if you have any other solution pls provied.