Newbie Here New smart LG tv

Your problem is the splitter. With this type of LNB each tuner requires its own cable from the LNB. If the LNB has only one output then you need to change it for a twin or quad LNB (may require a new dish depending how old the current one is).

The other option is a 'smart priority switch' but this means the Sky box or TV can control the LNB, but not simultaneously.
Lnb has 4 ports one of which I am using with a cable to my new TV via a splitter in the attic
 
Hi, Check all F type connections on route. Is there a cable from dish lnb to the splitter in the loft? As I have seen people not connecting the splitter to the lnb. Take the splitter out of the equation and connect the cables together to rule out the splitter. If the tv is near the sky box take the working one out of the sky box and try with that. Hope this helps.
 
Lnb has 4 ports one of which I am using with a cable to my new TV via a splitter in the attic

Again, splitters don't work with this type of LNB. There has to be a direct connection between the TV and LNB.

Incase I'm not understanding something, please post a photo of the splitter.
 
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