White Balance Adjustment - LG 49UF640 -ZA Series Service Manual

4.2. V-COM Adjust (ONLY FOR EPI model)
4.2.1 Overview
▪ V-COM adj. Objective & How-it-works
- Objective: To reduce each Panel's V-COM voltage
deviation
- How-it-works: When V-COM gain in the adjust-OSD of
each SET is at default value, each SET can have flicker by
each Panel's V-COM voltage deviation. In order to prevent
flicker of each SET, find the desired each Panel's V-COM
voltage value.
- Adj. condition: normal temperature
1) Surrounding Temperature: 25 °C ± 5 °C
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
4.2.2 Equipment
(1) Color Analyzer: CA-310(LED Module : CH 14) or CM-H505
(2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
(3) Adjust Remote control
(4) Signal : internal flicker Pattern in SET
▪ Color Analyzer Matrix should be calibrated using CS-100
4.2.3 Equipment connection MAP
Probe
USB to RS-232C
* If you want to use Signal Source,
you use TV internal Flicker pattern
4.2.4 Adj. Command (Protocol)
<Command Format>
CMD ID DATA CR RF
-. CMD: Command
-. ID : Command
-. Data : Command
Ex) [Send: va 00 00\r\n]
▪ RS-232C Command used during auto-adj.
RS-232C COMMAND
[CMD ID DATA]
va 00 00 V-com pattern
vb 00 00 ~ FE V-com adj.(internal Flicker pattern)
wb 00 FF V-com adj. completed
4.2.5 Adj. method
(1) Auto adj. method
1) Set TV in POWER-ONLY mode using POWER ONLY key.
2) Zero calibrate probe then place it on the center of the
Display.
3) Connect Cable(RS-232C to USB).
4) Select Model in "V-com adj. Program" and begin "V-com
adj.".
5) When V-com adj. is complete(OK).
6) Remove probe and RS-232C to USB cable to complete
adjustment.
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Flicker Analyzer
RS-232C
Computer
Explanation
- 16 -
▪ V-com Adj. must begin as start command "va 00 00" , and
finish as end command "wb 00 ff"
▪ V-com adjust data
V-com Data
43 inch
hex
Max B4
Default 96
Min 78
V-com Data
49 inch
hex
Max 8B
Default 6D
Min 4F
V-com Data
55 inch
hex
Max 85
Default 68
Min 49
V-com Data
65 inch
hex
Max AB
Default 8D
Min 6F

4.3. White Balance Adjustment

4.3.1. 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) Adjustment condition : normal temperature
1) Surrounding Temperature : 25 °C ± 5 °C
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) Adjustment Computer(During auto adj., RS-232C protocol
is needed)
(3) Adjustment Remote control
(4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model: 204, Pattern: 49)
→ Only when internal pattern is not available
Color Analyzer Matrix should be calibrated using CS-100.
•
dec
180
150
120
dec
139
109
79
dec
133
104
73
dec
171
141
111
LGE Internal Use Only