Assuming you have a JVR 212T, here's what the owner's manual says:
Power On/Off
• Press the power VOL/ button (1) to turn the unit on/off.
• Press and hold to turn the touch screen backlighting off when driving at night. Audio playback
is not interrupted.
• Touch any area of the screen to resume the previous display lighting and mode
Are you long pressing the power key?
Bruce
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