HELP!!!!!!!!! my lg tv's speaker is working well but when it is connected to an external speaker it produces a buzzing sound


Aug 7, 2017
I used RCA it is working but it produces a buzzing sound. I tried to change it but there's no change. I also checked if my speaker is broken but it is not it sounded well when i played music using usb and bluetooth, but when i tried to used it as a external speaker it has a buzzing sound. Idk if it is grounded or should i use other cable like optical digital audio. please reply btw my tv's brand is lg and the speaker is sony