LG 55UF6790, Service Manual

Page: 16 / 100

- 16 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
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
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
Explanation
CMD DATA ID
va 00 00 V-com pattern
vb 00 00 ~ FE V-com adj.(internal Flicker pattern)
wb 00 FF 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
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
Color Analyzer
Computer
Pattern Generator
RS-232C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed
43” inch 49” inch 55” inch 65” inch
V-com Data
hex dec hex dec hex dec hex dec
Max B4 180 8B 139 85 133 AB 171
Default 96 150 6D 109 68 104 8D 141
Min 78 120 4F 79 49 73 6F 111
Color Analyzer
Computer
Pattern Generator
RS-232C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed