LG 40LH5300 Service Manual page 10

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 ºC
- 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
Probe
RS -232C
* If TV internal pattern is used, not needed
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
Co lo r Analyzer
RS -232C
Co m p ut er
RS -232C
Pat t ern Generat o r
Signal Source
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj
RS-232C Explanation
COMMAND
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.
(2) Adjustment Map
Adj. item
R Gain
G Gain
B Gain
Cool
R Cut
G Cut
B Cut
R Gain
G Gain
B Gain
Medium
R Cut
G Cut
B Cut
R Gain
G Gain
B Gain
Warm
R Cut
G Cut
B Cut
- 10 -
Command Data Range
(lower caseASCII) (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