V-Com Adjust; Adjustment White Balance; Equipment Connection Map; Adj. Command (Protocol) - LG 55UB8500 Service Manual

5.4. V-COM Adjust

(*) ONLY FOR GP2 2010year model. GP3 LW Series
[2011year] spec out !

5.5. Adjustment White balance

5.5.1. Overview
▪ 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/216-Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
※ Color Analyzer Matrix should be calibrated using CS-1000

5.5.3. Equipment connection MAP

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]
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
(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
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 : LB41U Chassis ALL MODELS)
Adj. item Command
Cool R Gain
G Gain
B Gain
Medium R Gain
G Gain
B Gain
Warm R Gain
G Gain
B Gain
- 21 -
Explanation
Begin White Balance adj.
Gain adj.(internal white pattern)
Gain adj. completed
Offset adj.(internal white pattern)
Offset adj. completed
ff End White Balance adj.
(internal pattern disappears )
Data Range
(lower caseASCII) (Hex.)
CMD1 CMD2 MIN
j g 00
j h 00
j i 00
j a 00
j b 00
j c 00
j d 00
j e 00
j f 00
LGE Internal Use Only
MAX
C0
C0
C0
C0
C0
C0
C0
C0
C0