Use A Kensington Lock - Philips 19PFL3404H/12 User Manual

Use one-touch standby
1
Press and hold
device's remote control for at least three
seconds.
»
The TV and all connected HDMI
devices switch to standby.

Use a Kensington lock

There is a Kensington security slot at the back
of the TV. Prevent theft by looping a Kensington
lock between the slot and a permanent object,
such as a heavy table.
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Standby on the TV's or
EN 33