47LH55 (CHASSIS:LA92B) - LG TV Service Manual (repair manual). Page 16

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

- 16 -

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