Panasonic TC-55AS530U - Manual (Page 111)

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Zoom adjustments
Adjusts vertical position and size when FORMAT setting is set to
JUST or
ZOOM.
JUST:
V-size max is 3
ZOOM:
V-size max is 15
Screen display
(
On/Off)
Turns the screen off when you select.
● The sound is active even if the screen turns off.
● Press any buttons to turn the screen on.
● This function is effective in reducing power consumption when listening to
the sound without watching the TV screen.