Philips MB4010 - Manual (Page 8)

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Front Control locations and functions
POWER.
Press this knob, the green LED lights and the power is ON.
Press this knob again, the green LED disappears and the power
is OFF.
CONTRAST
Used to adjust the picture contrast level.
BRIGHTNESS
Used to adjust the overall screen brightness as a compensation
for ambient light.
"+" or "-"
Press "+" or "-" to adjust the selected function.
For an optimized adjustment of the picture following controls are
available at the front.