The television in the living room knows what you watched at 23:40 last Tuesday, which advert you skipped, and roughly how many people were in the room. That is not a side effect of the streaming app. It comes from the set itself, and it is switched on by default on nearly every television sold since 2015. None of the changes below need a subscription, and most take one evening with the remote.
Automatic content recognition is the setting that matters
ACR takes a fingerprint of whatever is on screen every few seconds and matches it against a database of programmes and adverts. It works on HDMI inputs and aerial broadcasts, not only the built-in apps, which is how it can report that you watched a match on a set-top box. It is also buried deeper than any other toggle. The names to look for, by brand:
- Samsung (Tizen): Settings, All Settings, General & Privacy, Terms & Privacy, Viewing Information Services.
- LG (webOS): All Settings, General, Live Plus — plus the separate LG Channels advertising consent nearby.
- Google TV / Android TV: Settings, Privacy, Usage & diagnostics.
- Roku TVs: Settings, Privacy, Smart TV experience.
- Vizio: Settings, System, Reset & Admin, Viewing Data.
Labels shift with firmware, so search the menu for “viewing”, “recognition” or “privacy” rather than hunting an exact phrase that may have been renamed last quarter.
The microphone is a second listening path
Voice remotes add a wake word on top of ACR. On a Samsung set with Bixby, long-press the microphone button and switch off Voice wake-up; the same area holds Alexa and Google Assistant integrations when the model offers them. LG’s ThinQ AI keeps its own wake-word toggle under General, AI Service.
One distinction people miss: the set’s local voice processing and the assistant’s cloud processing are separate consents. Declining the assistant does not disable the remote’s microphone, and muting the hardware switch disables both — which also removes hands-free volume control, usually a fair trade in a bedroom.
Reset the advertising ID, then reset it again next quarter
Advertising IDs are per-device identifiers that let brokers stitch your TV to your phone and laptop. You cannot delete the identifier outright, but resetting it breaks the profile that has accumulated against it. On Google TV: Settings, Privacy, Ads, then Reset advertising ID — Android 12 and later also offer Delete advertising ID, which is the stronger option. On Roku: Settings, Privacy, Advertising, Reset advertising ID. On Samsung: General & Privacy, Terms & Privacy, Interest-Based Ads.
Do it after a move or a household change. A fresh identifier makes the cross-device matching that ad tech relies on much weaker, and it costs about forty seconds.
Cutting the network beats trusting a menu
Firmware updates occasionally re-enable consents, and menus differ by region and model year. If you want the data flow to genuinely stop, treat internet access as the control. Three options, cheapest first:
- Leave the set off Wi-Fi and put a streaming stick in an HDMI port. The stick collects its own data, but you choose which one and can replace it.
- Block the television by MAC address in the router’s access-control list, then check the client list a day later — some sets fall back to a guest network or a second SSID.
- Run a DNS filter such as Pi-hole and watch the hostnames the set requests. Expect a long list, including telemetry endpoints that have nothing to do with playback.
The trade-off is honest: no internet means no automatic security patches. Either update manually every few months over a temporary hotspot, or accept the risk on a panel that only ever shows HDMI sources. Samsung publishes what it collects and why in its privacy policy, which reads faster than the on-screen consent wall and names the categories precisely.
Apps collect more than the panel does
Every installed app carries its own consent screen and its own advertising SDK, so a “clean” television with twelve apps is not clean at all. Audit the list once — Settings, Apps on Google TV, the equivalent per-brand app drawer elsewhere — and delete anything unopened in three months. Sideloaded APK files are the sharper risk: they skip store review and routinely request permissions a TV app has no business holding. If anyone in the house installs from a USB stick, check that the Unknown Sources toggle is off when they have finished.
Two toggles are worth a final pass because they default to on and sit apart from everything above: personalised recommendations, which feeds viewing history back into the home screen, and voice recording storage. On most sets they are separate switches. Turn both off, then photograph the settings screens with your phone — the next firmware update will move them, and the photo saves the rediscovery.
The same consent logic applies to any smart home gadget you add later, and since most of these menus are reached with the remote in one hand and a cloth in the other, it is worth knowing how to clean the panel without damaging it before you start prodding at the screen.