How to Stop Your Smart TV From Spying

What You'll Learn

You probably think your smart TV is just a dumb screen that displays content. I have bad news for you. Modern smart TVs, especially those from LG, are essentially sophisticated data extraction devices. They collect everything from your voice commands to your Wi-Fi geolocation data, often pinging servers every three seconds with granular details about what you watch. In this guide, you will learn how to identify exactly what your TV is sending, how to block those packets at the network layer, and how to scrub your device before it touches the secondary market.

By the end of this tutorial, you will have a hardened network perimeter that prevents your TV from phoning home to third-party ad networks like LG AdSolutions. We are going to go beyond the basic settings menu and look at how to actually inspect traffic and block malicious domains.

Prerequisites & What You Need

Before we start, you need to understand that flipping a switch in your TV settings is rarely enough. These manufacturers bake their tracking into the firmware. To succeed, you need control over your router or a local DNS sinkhole. Here is the gear list:

• A router that supports custom DNS (like AsusWRT, OpenWRT, or a standard ISP router with external DNS settings).
• Pi-hole or AdGuard Home installed on a Raspberry Pi or a local Linux server. This is non-negotiable for blocking telemetry at the domain level.
• A laptop or desktop to run network diagnostics.
• Access to your TV's advanced network settings.
• A basic understanding of how to read a packet capture (we will use Wireshark for this).

Developer Tip: If your router is ISP-locked and won't let you change DNS settings, just set the DNS on the TV itself to the IP address of your Pi-hole instance. It is not as secure as a network-wide block, but it stops the telemetry from reaching the analytics servers.

Step-by-Step Guide

We are going to move through the process of auditing, blocking, and sanitizing. Don't skip the audit phase, or you won't know if your blocks are actually working.

Step 1: The Audit Phase

First, we need to see what the TV is doing. Download Wireshark and set up a port mirror on your switch, or use a tool like tcpdump on your gateway device. You want to capture the traffic specifically coming from the TV's static IP.

# Filter traffic from your TV's specific IP address
# Replace 192.168.1.50 with your actual TV IP
tcpdump -i eth0 host 192.168.1.50 -w tv-traffic.pcap

After letting this run for ten minutes while you browse the TV's app menu, open the file in Wireshark. Look for HTTP/HTTPS requests to domains like us.adtech.lgsmartad.com or similar telemetry endpoints.

Step 2: Sinkholing Telemetry Domains

Once you have identified the domains, you need to prevent them from resolving. If you are using Pi-hole, you can add these to your blocklist. This forces the TV to receive a 'null' response when it tries to report your viewing habits.

# Example command to add a blocklist via Pi-hole's gravity tool
pihole -b us.adtech.lgsmartad.com
pihole -b lg-smart-ad.com
pihole -b smart-ad-service.com

By null-routing these, you essentially break the 'phone home' capability of the ad-tracking modules without crashing the streaming apps themselves.

Step 3: The Factory Reset Protocol

Most people fail here. They think 'signing out' of an app is enough. It is not. Data logs persist in local flash memory. If you are moving, selling, or tossing the TV, you must perform a factory reset that clears the NAND storage.

• Navigate to Settings > Support > Reset to Initial Settings.
• Do not just reboot; select the 'Initialize' option.
• If the TV has an 'AI Service' toggle, ensure it is disabled in the General menu before you even start the reset process.
• Physically disconnect the TV from the internet before resetting so it cannot report the reset event back to the manufacturer.

Real-World Example

Let's look at a concrete scenario. You are watching a 4K stream on an LG OLED running the latest webOS. The TV is attempting to send a data packet every three seconds to a server that performs audio fingerprinting. You have configured your network with an AdGuard Home instance.

Your logs show the following:

[2026-07-15 14:22:01] Blocked: lg-telemetry-endpoint.com (Blocked by AdGuard Home)
[2026-07-15 14:22:04] Blocked: lg-telemetry-endpoint.com (Blocked by AdGuard Home)
[2026-07-15 14:22:07] Blocked: lg-telemetry-endpoint.com (Blocked by AdGuard Home)

In this example, the TV tries to send the packet, hits your DNS sinkhole, and fails to establish a connection. Because the TV is programmed to be 'smart', it will attempt a retry. Since you have blocked the domain, the application code on the TV will eventually time out and continue to play your video without the telemetry data. This is the goal.

Common Mistakes & Troubleshooting

Mistake 1: Blocking CDN domains. Users often block the primary domain, which results in apps like Netflix or YouTube failing to load. Always whitelist your streaming providers.

Mistake 2: Ignoring Voice Assistant logs. If you use the voice remote, you are sending raw audio to the cloud. There is no 'network block' for this that won't break the feature. If you want privacy, do not use the voice remote.

Mistake 3: Thinking a VPN on the router fixes this. A VPN hides the content of the packets, but it doesn't stop the metadata collection from the TV's internal reporting logic.

Community Advice: If your smart TV starts throwing 'Network Error' codes after you tighten your firewall, check the logs in your Pi-hole. You likely blocked a core authentication domain. Add it back to the whitelist immediately.

• Always use static IPs for your IoT devices.
• Check your router logs once a month for new telemetry domains.
• Disable 'AI Recommendations' in every single app menu.
• Turn off the 'Always Listening' microphone setting in hardware if your model has a physical switch.
• Update your DNS blocklists weekly to catch new tracking domains.
• Never associate a primary personal email address with your TV account.
• Use a burner email if an account is strictly required.
• If you don't need smart features, use a dedicated streaming stick like an Apple TV or Roku, and keep the TV disconnected from the Wi-Fi entirely.
• Physically tape over the camera lens if your model includes one.
• Review your terms of service updates, even though they are boring.
• Monitor your outbound traffic for 'unusual' spikes at night.
• Use a VLAN for all your smart home devices to isolate them from your primary computer network.
• Keep your TV firmware updated, as some updates include privacy-focused toggles.
• Don't trust the 'Do Not Track' setting in the TV's menu; verify it with your own network tools.
• If you are recycling the TV, use a drill to physically destroy the flash memory chip on the mainboard.

Pro Tips & Advanced Usage

If you really want to go down the rabbit hole, implement Mantra-based filtering. This involves using a firewall like OPNsense to drop all outbound traffic from the TV's MAC address, except for specifically whitelisted IP ranges required for Netflix or your specific streaming service. This is the 'Zero Trust' approach to home entertainment. It takes about an hour to configure but provides the ultimate peace of mind.

Another advanced move: Use a dedicated 'dumb' interface. If you have an LG TV, look for the 'Hotel Mode' or 'Pro:Centric' settings. Many LG panels have hidden menus that allow you to disable smart features, app stores, and background data reporting entirely, turning the unit into a pure display device. You can usually access these by holding the 'Settings' button for ten seconds and entering a service code (often 1105). Use caution here: you can brick your TV if you change the wrong register.

What's Next: Related Tutorials & Next Steps

Now that you have secured your TV, your network is still full of other 'smart' devices that are likely behaving just as badly. Your smart fridge, toaster, and light bulbs are all potential data leaks. I recommend you look into setting up a dedicated VLAN for all IoT traffic.

Here are the next steps to keep your home network secure:

• Tutorial: Building a secure IoT VLAN with OPNsense.
• Tutorial: Hardening your home Wi-Fi against rogue device spoofing.
• Deep Dive: Understanding how AI agents like the Hermes Agent can help automate your network security audits.
• Tool Review: Comparing the best hardware firewalls for home use in 2026.

By taking control of your hardware, you reclaim your privacy. The 'smart' era doesn't have to mean the end of your digital autonomy, but you have to be the one holding the keys to the network gate.