Video Off and Display Off modes

One potential concern with so many types of circuitry in one chassis is mutual interference. Sony minimizes the possibility of radiated interference with power-off configurations that shut down potential sources of noise:

ƒVideo Off: Shuts down the video circuitry and the HDMI™ output to eliminate even slight residual effects on the audio circuitry.

ƒDisplay Off: Disables the display for a further reduction in noise.

ES DVD Players 2005, Version 4.0

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Sony NS3100, DVP-NS9100ES manual Video Off and Display Off modes