TL;DR: Most smart TVs collect viewing data through Automatic Content Recognition (ACR) by default, which tracks what you watch even from external devices like a cable box or game console plugged into the TV. Go into the TV's Settings > Privacy (the exact menu name varies by brand, e.g. Samsung, LG, Roku all label it differently) and disable ACR / viewing data collection and ad personalization, and cover the built-in camera or microphone if the model has one and you don't use voice features.
Most smart TVs collect viewing data through Automatic Content Recognition (ACR) by default, which tracks what you watch even from external devices like a cable box or game console plugged into the TV.
What Usually Causes This
This isn't usually a hack — it's a built-in data-collection feature manufacturers use for targeted advertising, enabled by default during initial setup and buried in the privacy settings menu.
What to Do About It
Go into the TV's Settings > Privacy (the exact menu name varies by brand, e.g. Samsung, LG, Roku all label it differently) and disable ACR / viewing data collection and ad personalization, and cover the built-in camera or microphone if the model has one and you don't use voice features.
If this looks similar to something else you've seen, it's worth reading Is My Webcam Hacked? How to Check.
This pattern shows up elsewhere too — see How to Check If Your Old Devices Still Have Your Data.
Frequently Asked Questions
What are the real warning signs?
Most smart TVs collect viewing data through Automatic Content Recognition (ACR) by default, which tracks what you watch even from external devices like a cable box or game console plugged into the TV.
What usually causes this?
This isn't usually a hack — it's a built-in data-collection feature manufacturers use for targeted advertising, enabled by default during initial setup and buried in the privacy settings menu.
What should I do about it?
Go into the TV's Settings > Privacy (the exact menu name varies by brand, e.g. Samsung, LG, Roku all label it differently) and disable ACR / viewing data collection and ad personalization, and cover the built-in camera or microphone if the model has one and you don't use voice features.
Should I be worried if I only see one sign?
One sign alone (like a slower device) is usually not cause for alarm — most single symptoms have mundane explanations. Multiple signs together, especially unexpected data usage or unfamiliar apps, are worth investigating.