The three main connections your TV needs
Your TV connects in three separate ways: to a power outlet, to a video source (cable box, streaming device, or antenna), and optionally to the internet. Most people set up the power and video connections right away, then add internet later if they want to use built-in streaming apps. You do not need all three to watch TV — a cable connection alone works fine — but understanding what each one does helps you decide what you actually need.
The physical cables matter less than knowing which port on your TV matches which device. Modern TVs have the same ports on the back, and once you know what HDMI is and where the power socket lives, the rest is just plugging things in. This guide walks you through each connection in the order that makes sense: power first, then video, then internet if you want it.
Key Takeaways
- Plug the power cable into the TV's power port on the back, then into a wall outlet or power strip — this is the only connection that must happen before anything else works.
- Video sources (cable boxes, streaming devices, antennas) connect to HDMI ports on the back of the TV, and you select which HDMI port to watch using the TV remote.
- Most TVs have multiple HDMI ports so you can leave several devices plugged in at once and switch between them without unplugging anything.
- Internet connects through WiFi (wireless) or an ethernet cable, and is only needed if you want to use streaming apps built into the TV itself.
- If your TV has no internet connection, you can still watch cable, antenna, or any device plugged into HDMI — internet is optional, not required.
Connecting the power cable
Find the power port on the back of your TV — it is usually a round socket near the bottom edge, and the power cable has a matching round plug. Plug the cable into the TV first, then plug the other end into a wall outlet or power strip. Do this before connecting anything else, because you need the TV powered on to see what you are doing with the other cables.
Use a power strip if you have one, especially if your TV is far from the wall outlet. A power strip lets you turn the TV and other devices on and off with one switch, and it protects against power surges that can damage electronics. If you use a power strip, make sure it is rated for the TV's wattage — most modern TVs draw between 50 and 150 watts, and any standard power strip handles that easily.
Connecting a cable box or satellite receiver
If you have cable or satellite TV, the box that came with your service connects to the TV using an HDMI cable. Look at the back of your TV and find the HDMI ports — they are flat rectangular sockets, usually labeled HDMI 1, HDMI 2, and so on. Most TVs have between three and five HDMI ports. Plug one end of the HDMI cable into any HDMI port on the TV, and the other end into the HDMI port on your cable or satellite box.
After you plug in the HDMI cable, turn on the TV and the cable box. The TV should show the cable box picture automatically, or you may need to press the Input or Source button on the TV remote and select the HDMI port you used. If you see "No Signal" on the screen, try a different HDMI port — sometimes one port does not work, and switching to another fixes it when ready.
Connecting a streaming device or antenna
Streaming devices like Roku, Apple TV, or Amazon Fire Stick plug into HDMI ports the same way a cable box does. Use a different HDMI port than your cable box uses, so you can leave both plugged in and switch between them. Plug the HDMI cable from the streaming device into an available HDMI port, then plug the device's power cable into a wall outlet or power strip.
An antenna connects differently — it plugs into the coaxial port on the back of the TV, which looks like a round socket with a threaded ring. This is the same type of port that a cable line uses. Screw the antenna cable in by hand until it is snug, but do not force it. After connecting the antenna, turn on the TV and run a channel scan using the TV remote — the TV will search for available channels and save them automatically.
Connecting to the internet with WiFi
Most modern TVs have built-in WiFi and can connect to your home network without any cables. Go to the TV's Settings menu using the remote, find Network or WiFi settings, and select your home network from the list. Enter your WiFi password when prompted. The TV will test the connection and show you whether it worked.
If your TV is far from the WiFi router and the signal is weak, you may see buffering or slow loading when you use streaming apps. Moving the router closer, removing obstacles between the router and TV, or switching to a 5GHz WiFi band (if your router supports it) usually improves the connection. If WiFi does not work at all, check that your router is on and that other devices in your home can connect to it.
Connecting to the internet with an ethernet cable
If WiFi is unreliable or unavailable, you can plug an ethernet cable directly into the TV's ethernet port — a flat rectangular socket labeled Ethernet or LAN on the back. Run the cable from your router to the TV, and the connection is automatic. Ethernet is faster and more stable than WiFi, but it requires running a cable across your room or wall, which is why most people use WiFi instead.
If you use an ethernet cable, you do not need WiFi on the TV at the same time. The TV will use whichever connection is plugged in. If both are plugged in, the TV usually prefers the ethernet connection automatically.
Switching between devices and inputs
Once you have multiple devices plugged in — a cable box on HDMI 1, a streaming device on HDMI 2, an antenna on the coaxial port — you switch between them using the TV remote. Look for a button labeled Input, Source, or HDMI. Press it, and the TV shows a menu of all connected devices. Select the one you want to watch, and the TV switches to that input when ready.
You can leave all devices plugged in all the time. Switching between them does not hurt anything, and it is much faster than unplugging and replugging cables. If a device is plugged in but you do not see it in the input menu, check that the cable is fully inserted into both the TV and the device, and that the device itself is powered on.
Frequently Asked Questions
Do I need to connect my TV to the internet to watch cable or antenna?
No. Cable, satellite, and antenna all work without any internet connection. Internet is only needed if you want to use streaming apps like Netflix or YouTube that are built into the TV. You can watch cable or antenna forever without connecting to WiFi or ethernet.
What if I plug a cable into the wrong HDMI port?
Nothing breaks. Just use the TV remote to press Input or Source, select the correct HDMI port from the menu, and you will see the picture. If you are not sure which port you used, try each one until the picture appears. Once you find it, you can label that port with a small sticker so you remember next time.
Can I use the same HDMI cable for two different devices?
Yes, but only one at a time. You would have to unplug the cable from one device and plug it into the other each time you switch. It is much easier to buy separate HDMI cables for each device — they cost between five and fifteen dollars — and leave them all plugged in.
Why does my TV say "No Signal" even though everything is plugged in?
The device might not be powered on, the cable might not be fully inserted, or you might be looking at the wrong input. Check that the cable box or streaming device has power, push the HDMI cable in firmly at both ends, and press Input on the remote to make sure you are watching the right HDMI port. If the device is on and the cable is in, try unplugging the HDMI cable and plugging it back in.
Do I need a special HDMI cable for 4K or newer TVs?
Most HDMI cables work with 4K, but if you have a very new TV and want to use advanced features like high frame rates, a cable labeled HDMI 2.1 is more reliable. For normal watching, any HDMI cable works fine. If you already have cables at home, start with those — you only need to buy new ones if you see picture problems.