Emerson EWL20D6, Service Manual

Page: 26 / 74

6-3 L2650EA
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
3. White Balance Adjustment 1
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use the remote control unit.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80%).
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. [VIDEO1]
Enter the Service mode. Press “VOL
p
” button on
the remote control unit and select “C/D1-” mode.
[VIDEO2]
Enter the Service mode. Press “VOL
p
” button on
the remote control unit and select “C/D2-” mode.
5. [VIDEO1]
Press “6” button to select “DB(C/D1)” for Blue
adjustment. Press “4” button to select “DR(C/D1)”
for Red adjustment. When “x” value and “y” value
are not within specification, adjust “DB (C/D1)” or
“DR (C/D1)”. Refer to “1. Initial Setting.”
Note: “DB(C/D1)” or “DR(C/D1)” must be adjusted
within ±0.005.
[VIDEO2]
Press “6” button to select “DB(C/D2)” for Blue
adjustment. Press “4” button to select “DR(C/D2)”
for Red adjustment.When “x” value and “y” value
are not within specification, adjust “DB(C/D2)” or
“DR(C/D2)”. Refer to “1. Initial Setting.”
Note: “DB(C/D2)” or “DR(C/D2)” must be adjusted
within ±0.005.
6. Turn the power off and on again. (Main power
button on the TV unit.)
4. White Balance Adjustment 2
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use the remote control unit.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 20%).
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Test Point Adj. Point Mode Input
Screen
VOL.
p
buttons
[VIDEO1]
C/D1
[VIDEO2]
C/D2
White Purity
(APL 80%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x: 0.271 to 0.281,
y: 0.277 to 0.287
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 80%
Test Point Adj. Point Mode Input
Screen
VOL.
p
buttons
[VIDEO1]
C/D1
[VIDEO2]
C/D2
White Purity
(APL 20%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x: 0.271 to 0.281,
y: 0.277 to 0.287
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 20%