Panasonic TH-55AS740A Manual page 192

Auto Standby
Automatically turns the TV to Standby mode for energy saving when no
operation is performed for 4 hours.
(On / Off)
Watching > Basic > Energy saving functions
No signal Power off
Automatically turns the TV to Standby mode to prevent unnecessary power
consumption when no signal is received and no operation is performed for 10
minutes.
(On / Off)
Watching > Basic > Energy saving functions
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