V-Com Adjust; Equipment Connection Map; White Balance Adjustment - LG 55UF6800 Service Manual

5.4. V-COM Adjust

(ONLY FOR EPI model, 43/49/55UF68/64 & 65UF7702)
5.4.1. 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±5
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
5.4.2. 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 Remocon
(4) Signal : internal flicker Pattern in SET
▪ Color Analyzer Matrix should be calibrated using CS-100

5.4.3. Equipment connection MAP

Probe
RS -232C
* If TV internal pattern is used, not needed
5.4.4. Adj. Command (Protocol)
<Command Format>
CMD ID DATA CR RF
-. CMD: Command
-. ID : Command
-. Data : Command
Ex) [Send: va 00 00\r\n]
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND
CMD DATA ID
va 00 00
vb 00 00 ~ FE
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
V-com pattern
V-com adj.(internal Flicker pattern)
V-com adj. completed
5.4.5. Adjustment 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 adj.
▪ V-com Adj. must begin as start command "va 00 00" , and
finish as end command "wb 00 ff"
▪ V-com adjust data
43" inch
hex dec
Max B4 180
Default 96 150
Min 78 120
5.4.5.1 Manual adj. method
TBD

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
- 16 -
49" inch 55" inch
V-com Data
hex dec hex dec
8B 139 85 133
6D 109 68 104
4F 79 49 73
Co lo r Analyzer
Co m p ut er
RS -232C
Pat t ern Generat o r
Signal Source
* If TV internal pattern is used, not needed
LGE Internal Use Only
65" inch
hex dec
AB 171
8D 141
6F 111
RS -232C
RS -232C