LG 22LV2500 Service Manual page 12

5. Final Assembly Adjustment
5.1. White Balance Adjustment
5.1.1. Overview
5.1.1.1. 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
1) Surrounding Temperature: 25±5°C
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
5.1.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(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
5.1.3. Equipment connection
Probe
RS -232C
* If TV internal pattern is used, not needed
Connection Diagram of Automatic Adjustment
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND Explanation
[CMD ID DATA]
Wb 00 00 Begin White Balance adj.
Wb 00 ff End White Balance adj. (internal pattern disappears )
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(end)) -> Off-set adj.
wb 00 ff ->End white balance auto adj.
Copyright LG Electronics. Inc. All right 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
(2) Adj. Map
Applied Model :
32/37/42/47LK450-UB, 32/42/47LK450-NA, 32/42/47LK451-
NB, 32/42/47LK452-NC,32LK330-UB, 32/42LK430-UA,
42/47/55LK520-UA,
42/47/55LK530-NA
Adj. item Command
(lower case ASCII)
CMD1
Cool R Gain j
G Gain j
B Gain j
R Cut
G Cut
B Cut
Medium j
R Gain
G Gain j
B Gain j
R Cut
G Cut
B Cut
Warm R Gain j
G Gain j
B Gain j
R Cut
G Cut
B Cut
5.1.5. Adjustment method
5.1.5.1 Auto WB calibration
1) Set TV in adj. mode using POWER ONLY (P-ONLY) key
2) Zero calibrate probe then place it on the center of the
Display
3) Connect Cable(RS-232C)
4) Select mode in adj. Program and begin adj.
5) When adj. is complete (OK Sing), check adj. status pre
mode (Cool, Medium, Warm)
6) Remove probe and RS-232C cable to complete adj.
• W/B Adj. must begin as start command "wb 00 00" , and
finish as end command "wb 00 ff", and Adj. offset if need
5.1.5.2 Manual adj. method
1) Set TV in Adj. mode using POWER ON
2) Zero Calibrate the probe of Color Analyzer, then place it on
the center of LCD module within 10cm of the surface..
3) Press ADJ key -> EZ adjust using adj. R/C 6. White-
Balance then press the cursor to the right (KEYG). (When
KEY(G) is pressed 204 Gray(80IRE) internal pattern will be
displayed)
4) One of R Gain / G Gain / B Gain should be fixed at 192,
and the rest will be lowered to meet the desired value.
5) Adj. is performed in COOL, MEDIUM, WARM 3 modes of
color temperature.
• If internal pattern is not available, use RF input. In EZ Adj.
menu 6.White Balance, you can select one of 2 Test-pattern:
ON, OFF. Default is inner(ON). By selecting OFF, you can
adjust using RF signal in 204 Gray pattern.
- 12 -
32LK330-NB, 42LK430-NA,
Data Range Default
(Hex.) (Decimal)
CMD2 MIN MAX
g 00 C0 172
h 00 C0 172
C0 192
i 00
64
64
64
a 00 C0 192
b 00 C0 192
c 00 C0 192
64
64
64
d 00 C0 192
e 00 C0 192
f 00 C0 172
64
64
64
LGE Internal Use Only