LG 42PT81 Service Manual page 10

11. White Balance
- Before White-balance, the AV ADC should be done.
* Notice
- Do the white balance adjustment under the 10LUX
- Before white balance, press the In-start key 2times and do
the reset like Fig.6
- Use the Torino inner pattern(216 gray pattern)
- To enter White-balance mode,press the IN-START key
2times.
- System control RS-232 Host should be "PC" for adjustment.
11-1. Test Equipment
(1) Color Analyzer (CA-100),CA-210.
* Note : When using the Color Analyzer with PDP,
recommend the CA-100 more than CA-210.
If CA-100 can not available, it is also good th use
the CA-210
(2) PC(for communication through RS-232C)
-> UART Baud rate : 115200.
(3) Pattern Generator(MSPG-925FA etc.)
11-2. Color Temperature & Color
Coordinates Setting
(1) When adjusting the Color Temperature of PDP, Color
Analyzer CA-210(Matrix should be corrected through
CH10 of CS-1000) should be used. When CA-210 have
used, it don't need to fit the CH10.
(2) Adjust the Color Temperature based below adjustment
color coordinates.
(3) Even if CH9 of CA-210 is corrected with Matrix, there may
be many character of Module and Filter.
(4) Therefore Refer to the below Color Coordinates Target.
But, in case of WCG module, use the CH12 of CA-210.
W
Target Value CA-210(CH10), CA-100
CSM Temp
COOL 11,000K
WARM 6,500K
( R/G/B gain and R/G/B offset Default values are different in
according to using module)
Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
80
80 80
80
7D
80 80
8C
(Fig.6)
x y
0.276±0.002 0.283±0.002
0.313±0.002 0.329±0.002
W Target Value of Brightness, Color Coordinates, Color Temperature
Desired result (216 Gray)
Brightness
Color
-Coordinate
Color Temperature
Desired result for high altitude(216 Gray)
Brightness
Color
-Coordinate
Color Temperature
11-3 .Manual white Balance (INNER Pattern)
(For White Balance, Adjust twice, Cool and Warm)
(1) Execute CA-100, CA-210(10CH) or CA-100 Zero Calibration.
(2) Use torino inner pattern as below Fig.7, Supply 216Level
(85 IRE) full screen pattern
(3) Enter the White Balance adjustment mode by pressing the
INSTART key twice(White Balance) on R/C.
(4) Stick sensor to center of the screen and select each items
(Red/Green/Blue Gain and Offset) using
on R/C.
(5) Adjust with R / G / B Gain using
(6) Adjust it until color coordination becomes as below.
- After All adjustment is completed, Please push "Instop" Key.
W
Color Temperature : Cool, Medium, Warm
(1) One of R/G.B Gain should be fixed at 80 and adjust two
Gain Value with decreasing the Default values from 80
1) When R Gain is Fixed at Default value(80)
- Adjust G gain and B gain with decreasing Default values
from 80
2) When B Gain is Fixed at Default value(80)
- Adjust R gain and G gain with decreasing Default values
from 80
3) When G Gain is Fixed at Default value(80)
- Adjust R gain and B gain with decreasing Default values
from 80
(2) R/G/B Gain and R/G/B Offset Default Value.
- Red Gain : 80
- Green Gain : 80
- Blue Gain : 80
uv
+0.000
+0.003
- 10 -
60 ± 20cd/m2(42XGA)
High Light
Cool X: 0.276±0.002, Y: 0.283±0.002
High Light
Normal X: 0.313±0.002, Y: 0.329±0.002
Cool 11,000±500K
Warm 6,500K±500K
High Light 50 ± 20cd/m2(80% of non-high altitude)
High Light Cool X: 0.276±0.002, Y: 0.283±0.002
Normal X: 0.313±0.002, Y: 0.329±0.002
Cool 11,000±500K
Warm 6,500K±500K
F
(Fig.7)
D E
/ (CH+/-) key
G
/ (VOL+/-) key on R/C.
LGE Internal Use Only