Symptoms
- Video breaks into square blocks briefly
- Picture looks fine then suddenly pixelates during motion
- Problem is worse on one channel or app than others
- Pixelation increases during storms or bad weather
Likely causes
- CommonWeak or unstable internet connection for streamingStreaming apps compress video more aggressively when bandwidth drops, causing visible blocks.
- CommonWeak antenna or cable signalOver-the-air and some cable signals degrade with weather, distance, or a loose connector.
- PossibleDamaged or loose coaxial/HDMI cableA frayed or poorly connected cable can introduce visible compression artifacts.
- PossibleSource device or app streaming bugA specific app or device can have a bug that causes blocky video even on a good connection.
What to do
- Check if pixelation happens on one specific app or channel, or across everything, to narrow down the source.
- Run an internet speed test near the TV if the issue is on a streaming app.
- Restart your router and the streaming device or smart TV.
- Check antenna or cable connections for looseness, and reposition an antenna if reception is weak.
- Try a wired Ethernet connection instead of Wi-Fi for the streaming device if possible.
- Lower the streaming quality setting manually in the app if your connection can't sustain HD or 4K.
- Contact your cable or satellite provider if pixelation happens consistently on their signal, since it may indicate a line issue.
Tools and parts
Coaxial cableSearch: “RG6 coaxial cable”
When to call a pro
If pixelation happens on every source including live antenna channels with a strong signal, a technician can check the tuner hardware.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.