@sfcfran Of course it will differ from model or manufacturer, but check this thread for what is going on in the LG tv’s;
The cable is connected to the TV power supply via a white connector, but pushed into that connector is spade plugs, which you solder your wires into first. You can try and clamp them into the spade, but its safer to solder IMO. It was all very straightforward, until LG decided to remove the small access port to even get to it on 2022 models. Perhaps this year will return to normal.
I now believe C7/Figure 8 cables, when using 3 core wire but floating at the component end, are compromised in performance due to the connected ground acting as an antenna up the cable length. I have tried it enough times now to confirm this for myself, the first time back 2012. Back then I had the Nordost Heimdall 2 Figure 8, which was just their normal power cable but with a C7 connector on the end. Floating the ground both ends was always better. On a Sony FALD TV, not floating the ground introduced a very slight extra judder in panning shots and fast movement. Floating it fixed that. And now the exact same thing occurred on the new LG G2, it was uncanny.