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5.5. White Balance Adjustment
5.5.1. Overview
5.5.1.1. W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel's W/B deviation
(2) How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic Range. In order to
prevent saturation of Full Dynamic range and data, one of
R/G/B is fixed at 192, and the other two is lowered to find
the desired value.
(3) Adj. condition: normal temperature
- Surrounding Temperature: 25±5 °C
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
5.5.2. Equipment
(1) Color Analyzer: CA-210 (LED Module : CH 14)
(2) Adj. Computer (During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-Gray
(Model: 217, Pattern: 49)
※ Color Analyzer Matrix should be calibrated using CS-1000
5.5.3. Equipment connection MAP
Probe
RS -232C
* If TV internal pattern is used, not needed
5.5.4. Adj. Command (Protocol)
<Command Format>
START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS A STOP
- LEN: Number of Data Byte to be sent
- CMD : Command
- VAL : FOS Data value
- CS : Checksum of sent data
- A : Acknowledge
(Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND
CMD
DATA
ID
wb
00
00
wb
00
10
wb
00
1f
wb
00
20
wb
00
2f
wb
00
ff
Copyright ©
LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Co lo r Analyzer
RS -232C
Co m p ut er
RS -232C
Pat t ern Generat o r
Signal Source
Explanation
Begin White Balance adj.
Gain adj.(internal white pattern)
Gain adj. completed
Offset adj.(internal white pattern)
Offset adj. completed
End White Balance adj.
(internal pattern disappears )
(Ex) wb 00 00 -> Begin white balance auto-adj.
wb 00 10 -> Gain adj.
ja 00 ff -> Adj. data
jb 00 c0
...
...
wb 00 1f -> Gain adj. complete
* (wb 00 20(start), wb 00 2f(endc)) -> Off-set adj.
wb 00 ff -> End white balance auto adj.
(2) Adjustment Map
Applied Model : ALL MODELS
Adj.
Command
item
(lower caseASCII)
CMD1
Cool
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
Medium
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
Warm
R Gain
G Gain
B Gain
R Cut
G Cut
5.5.5. Adjustment method
5.5.5.1. Auto WB calibration
(1) Set TV in adj. mode using POWER ONNY key
(2) Zero calibrate probe then place it on the center of the
Display
(3) Connect Cable (RS-232C to USB)
(4) Select mode in adj. Program and begin adj.
(5) When adj. is complete (OK Sign), check adj. status pre
mode(Warm, Medium, Cool)
(6) Remove probe and RS-232C to USB cable to complete adj.
▪ W/B Adj. must begin as start command "wb 00 00" , and
finish as end command "wb 00 ff", and Adj. offset if need
- 22 -
Data Range
(Hex.)
CMD2
MIN
MAX
j
g
00
C0
j
h
00
C0
j
i
00
C0
j
a
00
C0
j
b
00
C0
j
c
00
C0
j
d
00
C0
j
e
00
C0
j
f
00
C0
LGE Internal Use Only
Default
(Decimal)
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
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