I am assuming this should read 'Set top box'. What kind of cable are you using?
Usually the set top box connects via a SCART lead but yours may be HDMI if it is a very new set top box.
If you are using RCA plugs, you may have cross connected the wrong cables. The RCA cables should be colour-coded. RED and WHITE are for audio, Yellow is for video.
Best advice is to switch it all off, remove all the cables you attached, and start again. The instruction manual/user guide usually has an illustration to help you identify what your set up looks like - there are usually several examples.
If the cables you need did not come with the set top box, you will need to purchase them.
When you are connecting audio leads, you should use the 'audio out' on the set top box and the 'audio in' on your TV set.
It would help to know the EXACT model number of LG screen you have and the make and EXACT model number of the set top box.
Good luck.
Can you plug your TV directly to the TV and by-pass the cable box? if you can and the problem goes away then it's the cable box.
if the noise persist try a complete RESET of the TV, This will restor it to its original and new settings. You can find how to do this on the web site, manual or call Sony. If you do this and problem continues then you likely need a TV repair or new one.
Also remove any external sound device.
Best of luck
Too little information, what is the audio output device, what type of connection to the TV and what TV input are you using.
TV Inputs: Side Panel - 'Audio'
Rear Panel - 'HDMI In' , 'AV IN 1' , 'Component IN 1 & 2' , 'Audio (RGB/DVI)'
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