Canon EOS REBEL T7i Instruction Manual page 450

Troubleshooting Guide
Playback Problems
Part of the image blinks in black.
It is the highlight alert (p.377). Overexposed areas with clipped
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highlight will blink.
The image cannot be erased.
If the image is protected, it cannot be erased (p.360).
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The movie cannot be played back.
Movies edited with a computer cannot be played back with the
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camera.
Operation sound and mechanical sound can be
heard during movie playback.
If you operate the camera's dials or lens during movie shooting, the
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operation sound will also be recorded. Using the Directional Stereo
Microphone DM-E1 (sold separately) is recommended (p.301).
The movie appears to freeze momentarily.
If there is a drastic change in the exposure level during autoexposure
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movie shooting, the recording will stop momentarily until the
brightness stabilizes. In such a case, shoot in the <a> mode (p.268).
No picture on the TV set.
Make sure the [53: Video system] is correctly set to [For NTSC] or
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[For PAL] (depending on the video system of your TV set).
Make sure the HDMI cable's plug is inserted all the way in (p.357).
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