What are we talking about here. C3⅞ⁿ0 looks like an attempt at some sort of cable modem/router.
If so you might get better and quicker replies, and find other answers, over in the appropriate section:
Cable Modems & Routers
But first you'll have to explain a bit more. What is this TV? How are you trying to connect it? Wifi? Wired?
In many cases, a blinking LED is a sign that traffic is flowing on the network.
Just another user.My network DM200 -> R7800 -> GS316 -> PL1000 -> Orbi RBR40 -> Orbi RBS50Y -> RBS40V