My TCL smart tv E5800 won't let me turn the tv off. I hqave the tv connected to foxtel, I can turn the foxtel off but the tv stays on with a ghostly glow. Please help

Question edited for clarity 'make model (what it is)'.

How to Fix TCL Smart TV Remote - Support.com TechSolutions

https://www.techsolutions.support.com > how-to > how-...
Learn to solve common troubles you may have with your standard infrared and enhanced TCL Smart TV Remote.

TCL Roku TV: Wifi Internet Not Connecting? Try this First!!

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PREVIEW
2:47 I show you how to fix a TCL Roku TV (smart TV) where its not connecting to the wifi internet network (No Connection). By the end of this ...
YouTube · WorldofTech · Sept 16, 2020
Missing: 65R625 ‎' Must include: 65R625

TCL TV WiFi Not Working (Disconnects/Won't Detect/Connect)

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If your TCL TV WiFi won't turn on, press the 'Home' button on your remote control > press the right arrow button and select 'Network' > press the right arrow ...
Missing: 65R625 ‎' Must include: 65R625

How do I install the Foxtel Now box? Do I need someone to install the box?It's really easy! And you can do it yourself.
The Foxtel Now box connects to your TV with the High Speed HDMI cable (included), and to a power source with the Power cable (included).
The Foxtel Now box will connect to your internet via Wi-Fi or directly to your modem with the Ethernet cable (included).
Once you've connected these, you'll be guided by the easy on-screen set up and you'll start streaming in no time!
You can also access our set up guide.

tv might run android operating system .
does it have google play store
there is an app for foxtel
https://play.google.com/store/apps/details?id=au.com.foxtel.Go&hl=en_AU

depends on the output from Foxtel
is it antenna rf coaxial on foxtel ?
is it hdmi output on foxtel box ?
is it an AV RCA cable output on foxtel box ?
what does dvd player use for its output ?
Suggest you google these connection interface types and work out what is the output types
if rca then use av input on tv
is hdmi then use hdmi input on tv
then use select input source on tv to switch to whatever you used.

Check your router to see if the MAC Filtering feature is in use. If it is then you will need to add the TV's MAC address to the list of permitted devices before the connection will complete.