LG 55LW5500-CA (CHASSIS:LC12C) Service Manual ▷ View online
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5. Manual Adjustment
5.1 White Balance Adjustment
5.1.1 Overview
▪ W/B adj. Objective & How-it-works
- Objective: To reduce each Panel’s W/B deviation
- 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.
-Adj. condition : normal temperature
1) Surrounding Temperature: 25±5℃
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
5.1.2 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/216-Gray(Model:217, Pattern:78)
→ Only when internal pattern is not available
▪
Color Analyzer Matrix should be calibrated using CS-1000
5.1.3 Equipment connection MAP
Color Analyzer
Computer
Pattern Generator
※
※If TV internal pattern is used, not needed
Signal
Source
Probe
RS-232C
RS-232C
RS-232C
5.1.4 Adj. Command (Protocol)
<Command Format>
START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS A
STOP
STOP
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- LEN: Number of Data Byte to be sent
- CMD: Command
- VAL: FOS Data value
- CS: Checksum of sent data
- A: Acknowledge
Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]
- VAL: FOS Data value
- CS: Checksum of sent data
- A: Acknowledge
Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]
▪RS-232C Command used during auto-adj.
RS-232C COMMAND
[CMD ID DATA]
RS-232C COMMAND
[CMD ID DATA]
Explanation
wb
00
00
Begin White Balance adj.
wb
00
10
Gain adj.(internal white pattern)
wb
00
1f
Gain adj. completed
wb
00
20
Offset adj.(internal white pattern)
wb
00
2f
Offset adj. completed
wb
00
ff
End White Balance adj.
(internal pattern disappears )
(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(endc)) -> Off-set adj.
wb 00 ff ->End white balance auto adj.
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▪Adj. Map
Adj.
item
Command
(lower caseASCII)
Data Range
(Hex.)
Default
(Decimal)
Details
CMD1 CMD2 MIN MAX
R Gain
j
g
00
C0
TBD
G Gain
j
h
00
C0
TBD
B
Gain
j i 00
C0
TBD
R
Cut
TBD
G
Cut
TBD
Cool
B
Cut
TBD
R Gain
j
a
00
C0
TBD
G Gain
j
b
00
C0
TBD
B Gain
j
c
00
C0
TBD
R
Cut
TBD
G
Cut
TBD
Medium
B
Cut
TBD
R Gain
j
d
00
C0
TBD
G Gain
j
e
00
C0
TBD
B Gain
j
f
00
C0
TBD
R
Cut
TBD
Warm
G
Cut
TBD
5.1.5 Adj. method
5.1.5.1 Auto adj. method
1) Set TV in adj. mode using
ADJ
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
(Warm, Medium, Cool)
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
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5.1.5.2 Manual adj. method
1) Set TV in Adj. mode using
ADJ
key
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 Æ EZ adjust using adj. R/C Æ 7. White-Balance then press the cursor to the
right (KEY ).
(When KEY( ) is pressed 216 Gray 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 7.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 216 Gray pattern.
▪ 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
- PDP: Color Analyzer (CA-100, CA-100+, CA210) probe should be firmly attached to the
Module
- LCD: 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.
5.1.6 Reference (White Balance Adj. coordinate and color temperature)
▪ Luminance: 216 Gray
▪ Standard color coordinate and temperature using CS-1000 (over 26 inch)
Coordinate
Mode
x
y
Temp
△
uv
Cool
0.269 0.273 13000K
0.0000
Medium 0.285 0.293 9300K 0.0000
Warm 0.313 0.329 6500K 0.0000
▪ Standard color coordinate and temperature using CA-210
(CH 14)
Coordinate
Mode
x
y
Temp
△
uv
Cool
0.269±0.002 0.273±0.002 13000K
0.0000
Medium 0.285±0.002 0.293±0.002 9300K
0.0000
Warm 0.313±0.002 0.329±0.002 6500K
0.0000
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