Final Assembly Adjustment; White Balance Adjustment; Equipment Connection - LG 49LF5400 Service Manual

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
- Surrounding Temperature: 25±5 °C
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
- Before White balance adjustment, Keep power on status,
don't power off
5.1.1.2. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
- After Aging Start, Keep the Power ON status during 5
Minutes.
- In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
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)
→ Only when internal pattern is not available
※ Color Analyzer Matrix should be calibrated using CS-1000

5.1.3. Equipment connection

▪ When you connect the RS232 to set Phone jack, please use
3pin phone jack cable.
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND
CMD DATA ID
Wb 00 00
Wb 00
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.
(2) Adjustment Map
Adj.
item (lower case ASCII)
Cool R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
Medium R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
Warm R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
- 12 -
Explanation
Begin White Balance adj.
ff End White Balance adj.
(internal pattern disappears )
Command Data Range
(Hex.)
CMD1 CMD2 MIN MAX
j g 00 C0
j h 00 C0
j i 00 C0
j a 00 C0
j b 00 C0
j c 00 C0
j d 00 C0
j e 00 C0
j f 00 C0
LGE Internal Use Only
Default
(Decimal)
172
172
192
128
128
128
192
192
192
128
128
128
192
192
172
128
128
128