Asus X53S noise in audio when charging

[zloto111]

I've got a problem with my Asus X53S. When listen to music by headphones or speakers everything is okay (clean sound) a laptop use a battery. When I put a cable to charging I've got a noise. When I take out a cable everything is fine immediately. I use a standard audio out by minijack and checked on 4 different audio systems - the same result.

I tried to use a microphone out (after remapping), but it is the same.
I think it can be something like a clasp. Computer is after warranty period. Any advice?

 

[Rit_86]

Does the laptop power cord have an earthing pin? If yes, is your power source properly grounded? Check them both out and let me know. Also try putting it in a different socket.

 

[zloto111]

Does the laptop power cord have an earthing pin? If yes, is your power source properly grounded? Check them both out and let me know. Also try putting it in a different socket.

Yes, laptop power cord have an earthing pin. I think that power source is properly grounded. I tried this in 4 different places (my apartment, my friends house, McDonalds, cafe) and it's the same. Unfortunately I don't have another charger to check it.
I use original ASUS PA-1900-24 (http://tinyurl.com/lnxn5zc).

Problem mat occur due to plug not being plugged in fully. So plug it fully, if same sound come then check with some other similar plug.

Each plug is full in. Power plug and music output (minijack). When I partly pull out the power cable sometimes noise is changing for a second.

NOTE: Situation is the same when laptop is without battery, only on cable.