White Balance - LG 32LT75/76 Service Manual

6.3. Adjustment of RGB
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator
(Which has XGA [1024*768] 60Hz 8 Color bar 100%
pattern shown in Fig. 1)
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768@60Hz 100% Color Bar (MSPG-
925FS model:60, pattern:65) signal into RGB.
(Using D-sub to D-sub cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment
G
4) Press the (Vol.+) key operate To set , then it becomes
automatically.
5) Auto-RGB OK means adjustment is completed.
* Before White-balance, the AV ADC should be done.

7. White Balance

* Test Equipment
Color Analyzer (CA-210/CH.9)
-> When you adjust LCD color temperature, on Color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised) by
CS-1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
* Color temperature standards according to CSM and Module
Cool : 11,000k
Medium : 9,300k
Warm : 6,500k
* White balance adjustment coordinate and color temperature
Cool CS-1000
x
y
∆uv
Medium CS-1000
x
y
∆uv
Warm CS-1000
x
y
∆uv
- PC (for communication through RS-232C)
-> UART Baud rate : 115200 bps
- Luminance Y AV : upper 150 cd/m
-> Applying to Cool, Medium, Warm mode
* Connecting picture of the measuring instrument (On
Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START
-> Enter the mode of White-Balance, the pattern will come
out.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CA-210(CH 9)
0.276 0.276±0.002
0.283 0.283±0.002
0.000 0.000
CA-210(CH 9)
0.285 0.285±0.002
0.293 0.293±0.002
0.000 0.000
CA-210(CH 9)
0.313 0.313±0.002
0.329 0.329±0.002
0.004 0.004
2 (Typ : 350 cd/m
<Fig. 2> Connecting picture (On Automatic Control)
* Auto adjustment Map (RS-232C)
Baud Rate
115200
Protocol
Setting
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2) Adhere closely the Color Analyzer ( CA-210 ) to the
module less than 10cm distance, keep it with the surface
of the
vertically.(80~100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
- Using 'no signal' or 'full white pattern' or the others,
check the back light on.
2 )
- 12 -
Type
Data bit
8
Index Cmd 1 Cmd 2 Data Min Value
R-Gain_Normal j a
G-Gain_Normal j b
B-Gain_Normal j c
R-Gain_Warm j d
G-Gain_Warm j e
B-Gain_Warm j f
R-Gain_Cool j g
G-Gain_Cool j h
B-Gain_Cool j i
R-Offset_Normal l j
G-Offset_Normal l k
B-Offset_Normal l l
R-Offset_Warm l m
G-Offset_Warm l n
B-Offset_Warm l o
R-Offset_Cool l p
G-Offset_Cool l q
B-Offset_Cool l r
Internal Pattern Signal w b
Internal Pattern Signal w b
Internal Pattern Signal w b
Module and Color
LD74A
Stop bit Parity
1 None
Max Value
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00(00) 128(80)
00 W/B adjustment Start
10 Internal Pattern use
ff W/B adjustment end
Analyzer's Prove
LGE Internal Use Only