Samsung UE40D7000LU E-Manual page 300

Issues
The picture is distorted: macro
block error, small block, dots,
pixelization
Colour is wrong or missing.
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Solutions and Explanations
•
Compression of video contents may cause picture distortion especially
in fast moving pictures such as sports and action movies.
•
Low signal level or bad quality can cause picture distortion. This is not a
TV issue.
•
Mobile phones used close to the TV (cca up to 1m) may cause noise in
picture on analogue and digital TV.
•
If you're using a component connection, make sure the component
cables are connected to the correct jacks. Incorrect or loose
connections may cause colour problems or a blank screen.
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