Pairing wifi bluetooth headphones to tv

Jan 2, 2019
I have a new LG 55SK8500PVA smart tv, and a pair of Sony WH-CH700N Bluetooth wifi headphones. I am unable to pair them with my tv, I keep getting the message no devices found.
They pair Ok with my other tv which is an LG 49UH770T. I have followed all steps as per LG and Sony, still no Joy. Can anybody help. Headphones are brand new, and are bluetooth 4.1