What is the most common cause of a monitor showing horizontally torn images on the screen?

Explanation:

When the quality of video get distorted because of lossy data compression, this might be video artifact. Such compression are done in order to comprise the data in a smaller disk space.

This compression results in the loss in quality and the compressor gets unable to reproduce the full quality of original version. When such quantization gets larger, it leads to torn or breakup in the picture quality.

FIXING:

For fixing such torn, deblocking filters are used that pass the output from decoder into them and process them to get better.

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