If you open the doors does the noise stop?
Ok so its not the fans so the noise must be coming from the compressor area at the back.
Strange as to be honest these compressor on this model LG use a new compressor called an linear compressor which is supposed to be quitter then normal compressors.
But if its a load noise then this isn't correct as they shouldn't be load.
Pull it out a little bit and make sure nothing is touching the appliance at the back as that can cause vibration.
Then see how it goes but if its still making the load noise the you need to either get the retailer to replace the appliance or get LG out to check it out as they shouldnt
make load noises as that's not correct.
If you need anymore info just get back to me.
Sorry im not sure what you mean by
''seen in manual what is on cycle is that why it's humming so load''
What cycle do you mean?
Ok im with you. When its like that the compressor runs faster so it does make a bit louder noise then normal but nothing dreadful.
As as you said it is a loud dreadful humming noise that shouldn't be like that. It should make a low humming noise when running but nothing loud so if its like that then you need to get them to check it out.
As theres nothing inside a fridge that needs to work in or settle down so what noise it makes now will more then likely just carry on.