LG KM555R User Manual page 92

Troubleshooting
MESSAGE
Number not
permitted
LCD
Dimming
The screen
does not turn
on when I
receive a
call.
90 LG KM555R | User Guide
POSSIBLE CAUSES
The Fixed dial number
function is on.
Low battery
When the battery is
empty, the LCD screen
will be dimming to
reduce the power
supply.
Proximity sensor
problem
POSSIBLE CORRECTIVE
MEASURES
Check settings.
Recharge the battery.
The proximity sensor is
detecting a obstacle in front
of the screen and turns off
the screen to avoid accidental
keypresses.
Make sure that the area
around the proximity sensor
is clean and perform a
calibration of the sensor.