LG 202B - Manual (Page 4)

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Overview
The Remote Jack Pack (RJP) contains circuitry to determine the pres-
ence of a signal at each input jack.
(Note: Audio In, Audio In L-R and Video In inputs detect the pres-
ence of the inserted plug, regardless if a signal is present or not.)
When a source is detected, its priority is compared to the priority of
other sources which may be present. If the newly-connected active
source is of higher priority than the existing source(s), the RJP
directs the TV display panel to that source.
Video and audio are monitored and switched independently.
Power is supplied to the RJP by the TV display panel via the control
signal cable.