TAG 20 - Manual (Page 122)

8-6 Troubleshooting
If the power button does not respond to a light touch, press the
button firmly.
If you are using battery power, make sure that it has a charge
remaining and that it is installed correctly.
During operation, the screen may automatically turn off as a result of
power management. Press any key to see if the screen comes back.
The brightness level might be too low. Increase brightness by
pressing on the brightness/volume control button on the front panel
of the Tablet PC.
The display output might be set to an external monitor.
Reset the Tablet PC by pressing Ctrl + Alt + Del keys if you are using an
external keyboard.
Try turning the computer off, wait a few seconds, and then turn it
back on.
The characters on the screen are dim.
Adjust the brightness.
Bad dots appear on the display at all times.
A small number of missing, discolored, or bright dots on the screen
are an intrinsic characteristic of TFT LCD technology. It is not
regarded as a LCD defect. The Inspection Standard generally agreed
in the LCD industry allows a maximum of 8 pixels on a unit.
Term definition:
Bright dots When the LCD screen is lighted, dots appear bright
at a dark area. Red/green/blue bright dots also
count.
Dark dots When the LCD screen is lighted, dots appear black
at bright areas.
Distance between
defective dots
The minimum distance between two defective dots.
Adjacent defective dots Defective dots within a radius of 10 mm.