Performance Verification
Display and Backlight Test 4
4-7
Display and Backlight Test
Proceed as follows to test the display and the backlight:
1. Press to turn the Test Tool on.
2. Remove the BC190 power adapter, and verify that the backlight is dimmed.
3. Apply the BC190 power adapter and verify that the backlight brightness
increases.
4. Press and hold
USER
(USER), then press and release
CLEAR
(CLEAR MENU).
The Test Tool shows the calibration menu in the bottom of the display.
5. Do not press
F3
now. If you do, turn off and turn on the Test Tool, and
start at Step 4.
6. Press
CLEAR
to toggle on and off the menu.
5. Press
F1
(PREVIOUS) three times.
The Test Tool shows
Contrast (CL 0100):
6. Press
F3
(CALIBRATE). The Test Tool shows a dark display. The test
pattern shown in Figure 4-2 may be not visible or hardly visible.
Observe the display closely, and verify that the display shows no
abnormalities, such as very light pixels or lines.
hpp204.eps
Figure 4-2. Display Test Pattern
7. Press
F2
.
The test pattern is removed and the Test Tool shows
Contrast (CL 0100):
8. Press
F2
again to do the next Contrast (CL 0110):
9. Press
F3
(CALIBRATE).
The Test Tool shows the display test pattern at default contrast, see
Figure 4-2.
Observe the display closely. Verify that the display shows no abnormalities
and that the contrast of the upper left and upper right square of the test
pattern is equal.
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