Noise in the headphones jack!

[andrewKode]

Hello, I have a laptop Lenovo Z510. It's not new and definetly not on warranty anymore. So one day I've noticed there is a bad sound coming from my jack and I opened my laptop to try to figure out what's wrong. The sound sounded like mono, without bass, no voice in songs. So there was a small pin in the jack not making a good connection. I put my laptop case back and now I have other problem: NOISE.
There is a constant noise coming from the jack which remains unchanged no matter what volume level is and when I'm scrolling or doing something on the display other small sound gets added to that. It's somehow annoying... any ideas whats causing it? Maybe some bad grounding?
Thanks!

 

[andrewKode]

One more thing, if I remove the AC power cable the noise becomes weaker.

 

[scout_03]

when you did put it back you might have one cable made contact with case so recheck it .

 

[andrewKode]

when you did put it back you might have one cable made contact with case so recheck it .

the AC cable or what cable should i be looking for?

 

[helpstar]

that´s pretty normal for Laptops, it´s a pyhsical thing, "ground loop".

you can try to install a newer version of the audio driver and update the BIOS.
But I don´t think you can do something against it but buying an external USB sound card or an USB headphone

Another power supply could help too

 

[scout_03]

could be the jack connector that touch the case or internal part made ground .

 

[helpstar]

if the problem just recently popped up, a solder joint of the jack is cracked. Resolder the contacts, if you can, or replace the jack with a new one. Do other headphones/speakers are having the same problem?

 

[andrewKode]

if the problem just recently popped up, a solder joint of the jack is cracked. Resolder the contacts, if you can, or replace the jack with a new one. Do other headphones/speakers are having the same problem?

Yes, every thing connected to the jack works like that.
So the noise becomes weaker when I unplug the AC andit becomes stronger when Im scrolling or stuff like that. Maybe I should replace the little board because its separated by the motherboard anyway. It all started when I opened the case and bent that pin inside so it could touch the jack when plugged in. I dont remember hearing a noise before that, only a bad sound described abose, no noise.

 

[scout_03]

witch pins did you bent could find a picture of it on the net .

 

[andrewKode]

witch pins did you bent could find a picture of it on the net .

Sure, this one: https://ibb.co/iNe9yv
But I did a mistake, to figure out what pin is the problem I tried to repair the laptop while it was turned on, but I DID NOT touch the motherboard, only the little one on the edges. I also touched the two pin holes from the back, but I didn't bend them, only that one.

 

[scout_03]

just to make a test put a piece of electrical tape on this connector and put it back then check sound . also always work in system power off .

 

[andrewKode]

just to make a test put a piece of electrical tape on this connector and put it back then check sound . also always work in system power off .

If I do that then it will just work like before.

 

[scout_03]

if it is the pins that made it sound will be back ,tape will serve as a isolator .