LG 60UH7700 Service Manual page 20

5.3. Camera Port Inspection
(1) Objective : To check how it connects between Camera and
PCBA normally, and their Function
(2) Test Method : This Inspection is available only Power-Only
Status.
1) Push Camera Up
2) Camera's Preview picture appears on TV Set
3) Push Camera Down
(3) RS-232C Command
RS-232C COMMAND
CMD DATA ID
Ai 00 23 Camera Function Start.
Ai 00 24 Camera Function End.
5.4. V-COM Adjust
(ONLY FOR EPI model, 43/49/55UH6600, 43/49/55UH6500)
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 ºC ± 5 ºC
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
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Explanation
Co lo r Analyzer
RS -232C
Co m p ut er
RS -232C
Pat t ern Generat o r
Signal Source
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
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
- 20 -
Explanation
V-com pattern
V-com adj.(internal Flicker pattern)
V-com adj. completed
49" inch 55" inch 65" inch
V-com Data
hex dec hex dec hex
8B 139 85 133 AB
6D 109 68 104 8D
4F 79 49 73 6F
LGE Internal Use Only
dec
171
141
111