FUNAI LT5-S20BB, Service Manual

Page: 19 / 56

6-3 A7343EA
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
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity.
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. [RF/AV2(CVBS)]
Enter the Service mode. Press [ -] button on the
remote control unit and select “C/D/S-1” mode.
[AV1(RGB)]
Enter the Service mode. Press [ -] button on the
remote control unit and select “C/D/S-2” mode.
[DVB]
Enter the Service mode. Press [ -] button on the
remote control unit and select “C/D/S-3” mode.
5. [RF/AV2(CVBS)]----(APL 80%)
Press [6] button to select “DB(C/D/S-1)” for Blue
adjustment. Press [4] button to select “DR(C/D/S-
1)” for Red adjustment. When “x” value and “y”
value are not within specification, adjust “DB (C/D/
S-1)” or “DR (C/D/S-1)”. Refer to “1. Initial Setting.”
[RF/AV2(CVBS)]----(APL 20%)
Press [3] button to select “COB(C/D/S-1)” for Blue
adjustment. Press [1] button to select “COR(C/D/
S-1)” for Red adjustment. When “x” value and “y”
value are not within specification, adjust “COB (C/
D/S-1)” or “COR (C/D/S-1)”. Refer to “1. Initial
Setting.”
[AV1(RGB)]----(APL 80%)
Press [6] button to select “C-DB(C/D/S-2)” for Blue
adjustment. Press [4] button to select “C-DR(C/D/
S-2)” for Red adjustment.When “x” value and “y”
value are not within specification, adjust “C-DB(C/
D/S-2)” or “C-DR(C/D/S-2)”. Refer to “1. Initial
Setting.”
[AV1(RGB)]----(APL 20%)
Press [3] button to select “C-COB(C/D/S-2)” for
Blue adjustment. Press [1] button to select “C-
COR(C/D/S-2)” for Red adjustment.When “x”
value and “y” value are not within specification,
adjust “C-COB(C/D/S-2)” or “C-COR(C/D/S-2)”.
Refer to “1. Initial Setting.”
6. [DVB]----(APL 80%)
Press [6] button to select “DB(C/D/S-3)” for Blue
adjustment. Press [4] button to select “DR(C/D/S-
3)” for Red adjustment.When “x” value and “y”
value are not within specification, adjust “DB(C/D/
S-3)” or “DR(C/D/S-3)”. Refer to “1. Initial Setting.”
[DVB]----(APL 20%)
Press [3] button to select “COB(C/D/S-3)” for Blue
adjustment. Press [1] button to select “COR(C/D/
S-3)” for Red adjustment.When “x” value and “y”
value are not within specification, adjust “COB(C/
D/S-3)” or “COR(C/D/S-3)”.
Refer to “1. Initial Setting.”
7. Turn the power off and on again.
Test Point Adj. Point Mode Input
Screen
[ -]
button
[RF/AV2(CVBS)]
C/D/S-1
[AV1(RGB)]
C/D/S-2
[DVB]
C/D/S-3
White Purity
(APL 80%)
or
(APL 20%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x= 0.276 ± 0.03,
y= 0.282 ± 0.03
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 80%