Sharp LC-22DC30M, Service Manual

Page: 17 / 63

LC-22DC30M
5 – 4
5.2. White balance adjustment
Adjustment item Adjustment conditions Adjustment procedure
1 Adjustment Brightness : MAX
AV Mode: DYNAMIC
Active Backlight : OFF
Set the luminance meter on
the center of the screen For the details of white balance adjustment procedure, please refer to white balance
adjustment spec for Kameyama model.
1) Confirm the set condition.
2) Connect the white balance jig.
3) Through RS-232C command, adjustment mode screen is displayed.
2 Auto Adjustment
performance [command]
Adjustment Mode
KRSW0001
KKT10037
FACT0001
Setting
KYOF0001
OSDS0001
SBSL16_ _
Multi point adj. Mode
MSET0000
WBI20255
Point 2
WBI20229
MG2G****
MG2B****
MG2R****
Point 1
WBI10051
MG1G****
MG1B****
MG1R****
Write
MSET0003
Set Max.Level
MGMG****
MGMB****
MGMR****
[Adjustment Procedure]
1) Using the remote control, set the LCD TV to adjustment mode.
2) Measure Max brightness (Lmax).
3) Calculate min. brightness (Lmin)=Lmax/1000.
4) Measure Point 2 brightness (Lhigh).
5) Set the reference value R,G,B of Point 2 (Ref.2)=3664 x (229/P2)
where P2=255 x [(Lhigh-Lmin)/(Lmax-Lmin)]1/2.2
6) Set the specified gradation for point 2, fix the most faint colour to get reference
value, adjust others 2 colour to minus adjustment for reference value of point 2.
7) Measure Point 1 brightness (Llow).
8) Set the reference value R,G,B of Point 1 (Ref.1)=816 x (51/P1)
where P1=255 x [(Llow-Lmin)/(Lmax-Lmin)]1/2.2
9) Set the specified gradation for point 1. Set G of point 1 to the default value [(Ref.1 x
G value of point 2/Ref.2), with fractions rounded] and adjust RB to the reference
value of point 1.
10)Set the G of point Max. to the default value (4080 x G value of point 2/Ref.2). Set
the R,B Max. value [Gmax-G value of point 2 + (R,B value of pint 2)].
11)Adjusted value is writing at [command] MSET0003.
12)Shut down the AC power.
*Initial value at RGB 2 point : 3664
*Initial value at RGB 1 point : 816
[Adjustment Value]
I Teaching set send by engineering dept is set as reference.
[Reference value for adjustment reference]
Equipment: Luminance meter [Minolta CA-210]
Ref. : For inspection, set the LCD TV as below.
AV MODE: [DYNAMIC] (Reset)
Aging Time: Minimum 60 minutes
Level
Spec
Data
Adjustment
Spec.
Inspection
Spec.
Point 2
ref.
values
Point 1
ref.
values
229
51
x=0.281
y=0.288
x=0.272
y=0.277
r
0.0010
r
0.0045
r
0.0020
r
0.0090