LG 42LE4500 - White Balance Adjustment; Adjustment Commands and Methods

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LGE Internal Use OnlyCopyright © 2010 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.3. White Balance Adjustment
4.3.1 Overview
(1) W/B adj. Objective & How-it-works
(2) Objective: To reduce each Panel’s W/B deviation
(3) 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.
(4) Adj. condition : normal temperature
1) Surrounding Temperature : 25 ºC ± 5 ºC
2) Warm-up time: About 5 Min
3) Surrounding Humidity : 20 % ~ 80 %
4.3.2 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/216-Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
A Color Analyzer Matrix should be calibrated using CS-1000
4.3.3. Equipment connection MAP
Color Analyzer
Computer
Pattern Generator
RS-232C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed
4.3.4. Adj. Command (Protocol)
<Command Format>
- 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]
A RS-232C Command used during auto-adj.
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. completed
*(wb 00 20(start), wb 00 2f(end)) -> Off-set adj.
wb 00 ff -> End white balance auto-adj.
A Adj. Map
LEN CMD VAL
CS
RS-232C COMMAND Explanation
[CMD ID DATA]
wb 00 00 Begin White Balance adj.
wb 00 10 Gain adj.(internal white pattern)
wb 00 1f Gain adj. completed
wb 00 20 Offset adj.(internal white pattern)
wb 00 2f Offset adj. completed
wb 00 ff End White Balance adj.(Internal pattern disappears)
ITEM Command Data Range Default
(lower case ASCII) (Hex.) (Decimal)
Cmd 1 Cmd 2 Min Max
Cool R-Gain j g 00 C0
G-Gain j h 00 C0
B-Gain j i 00 C0
R-Cut
G-Cut
B-Cut
Medium R-Gain j a 00 C0
G-Gain j b 00 C0
B-Gain j c 00 C0
R-Cut
G-Cut
B-Cut
Warm R-Gain j d 00 C0
G-Gain j e 00 C0
B-Gain j f 00 C0
R-Cut
G-Cut
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Details