ViewSonic VS19852 User Manual page 30

Key
Move and hold the Joy Key
Power button.
When the menu appears on the screen, continue holding the key
for 10 seconds to lock/unlock the Power button.
If the Power button is locked, the below message will appear on
the screen:
Move and hold the Joy Key
boot up screen when the device is turned on.
Description
for 5 seconds to lock/unlock the
Locking Power Button
Press and hold for 10s to lock Power
Power Lock/Unlock
Power Button Locked
for 5 seconds to display/hide the
Boot Up Screen On/Off
Off
Press to Turn On
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