55LH40, 55LH41, 55LH400С (CHASSIS:LA92B) - LG TV Service Manual (repair manual). Page 18

6.1.1 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.

6.1.2 Equipment

1)  Color  Analyzer  :  CA-210  (NCG:  CH  9  /  WCG:  CH12  /LED
Module:CH14)
2) Adjustment Computer (During auto adj., RS-232C protocol
is needed)
3) Adjustment R/C
4)  Video  Signal  Generator  MSPG-925F  720p/216Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
• Color Analyzer Matrix should be calibrated using CS-1000

6.1.3 Equipment connection map

• Protocol
<Command Format>

- LEN: Number of Data Byte to be send
- CMD: Command
- VAL: FOS Data
- CS: Checksum of sent Data
- A: Acknowledge
Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]

• RS-232C Command used during auto-adjustment

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 adjustment

wb 00 ff -> End white balance auto-adjustment

6.1.4 Adjustment method

6.1.4.1 Auto adjustment method

1) Set TV in adj. mode using POWER On 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  Sign),  check  adj.  status  per

mode (Warm, Medium, Cool)

6) Remove probe and RS-232C cable to complete adj.

• adj.  must  begin  w/  command  “Wb  00  00”,  and  end  w/”wb  00

ff” and adjustment offset if needed.

6.1.4.2 Manual adj. method

Dynamic contrast : off
Dynamic color : off
OPC : Off
Energy saving mode : Off

1) Set TV in adj. mode using POWER On Key
2) Press ADJ key Æ EZ adjust using adj. R/C
3) Using CH + / - KEY, select 7.TEST PATTERN then press

Enter to place inHEAT RUN mode and wait for 5 minutes.

4) Zero calibrate the probe of Color Analyzer, then place iton

the center of LCD module within 10 cm of the surface.

5) Press ADJ key Æ 6. White-Balance then press the cursor

to the right (KEY

)

(When

is  pressed  Full  White  internal  pattern  will  be

displayed)

6) One  of  R  Gain  /  G  Gain  /  B  Gain  should  be  fixed  at  192,

and the rest will be lowered to meet the desired value.

7) Adjustment  is  performed  in  COOL,  MEDIUM,  WARM  3

modes of color temperature

• If  internal  pattern  is  not  available,  use  RF  input(Full  white

216 gray) In EZ Adjustment menu 6.White Balance, you can
select one of 2 options: Test pattern ON, Test pattern OFF.
Default is “ON” By selecting “OFF”, you can adjust using RF
signal.   

• Adjustment condition and cautionary items

1) Lighting condition in surrounding area Surrounding lighting

should be lower than 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°)

- B/L  on  should  be  checked  using  no  signal  or  Full  white

Pattern

6.1.5 Reference 

(White Balance adj. coordinate and color temperature)

• Luminance: Full white 216 Gray
• Standard color coordinate and temperature using CS-1000

- 18 -

C

2009

Color Analyzer

Computer

RS-232C

# Pattern Generator

* If TV internal pattern is used,not needed

Signal Source

Probe

RS-232C

RS-232C

START     6E    A     50    A

      LEN    A    03    A

      CMD    A    00    A

      VAL    A    CS    A

STOP 

CMD

ID  DATA

Explanation

wb 

00 

00 

Begin White Balance adj.

wb

00 

ff

End White Balance adj. 

(internal pattern disappears)

Coordinate 

Mode 

x 

y 

Temp 

uv∆

Cool 

0.276 

0.283 

11000K 

0.0000

Medium 

0.285 

0.293 

9300K 

0.0000

Warm 

0.313 

0.329 

6500K 

0.0000