Nikon D780 Reference Manual page 805

Photographs and movies do not appear to have the same
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exposure as the preview shown in the monitor during live view:
Changes to monitor brightness during live view have no effect on
images recorded with the camera.
Flicker or banding appears in the display during movie recording:
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Select [Flicker reduction] in the movie shooting menu and choose an
option that matches the frequency of the local AC power supply.
Bright regions or bands appear in live view:
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Bright regions or bands may occur if a flashing sign, flash, or other
light source with brief duration is used during live view.
Smudges appear in photographs:
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•
Are there smudges on the front or rear (mount-side) lens elements?
•
Is there foreign matter on the low-pass filter? Perform image sensor
cleaning.
Live view ends unexpectedly or does not start:
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•
Live view may end automatically to prevent damage to the camera's
internal circuits, for example if:
- The ambient temperature is high
- The camera has been used for extended periods in live view or to
record movies
- The camera has been used in continuous release modes for
extended periods
•
If the camera is running hot and live view does not start, wait for the
internal circuits to cool and then try again. Note that the camera
may feel warm to the touch, but this does not indicate a
malfunction.
Troubleshooting
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