55LH80YD (CHASSIS:LB91F) - LG TV Service Manual (repair manual). Page 13

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. 

5.1.2 Equipment

1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12)
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 

5.1.4 Adj. Command (Protocol)

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

• RS-232C Command(Automatic adjustment)

Ex)  wb 00 00 : Start Auto-adjustment of white balance.

wb 00 10 : Start Gain Adjustment (Inner pattern) 
ja 00 ff : Adjustment data
jb 00 c0 : 
…
wb 00 1f : End of Gain adjustment

* (wb 00 20(start), wb 00 2f(end)) -> In the case of Off-

set adjustment
wb 00 ff : End of white balance adjustment

• Adjustment Map

5.2.1 Automatic Adjustment

1)  The  adjustment  condition  should  be  set  by  the  Power  On

key.

2)  Perform  the  zero  calibration  of  the  Color  Analyzer  and

place the probe close to the display center.

3) Connect the communication cable (RS-232C).
4)  Select  the  desired  model  of  the  adjustment  program  and

perform the adjustment.

5)  After  the  adjustment  is  ended  (check  the  OK  sign),  check

the adjustment condition for each mode of the set.
(Warm, Medium, Cool)

6) Disconnect the probe and the communication cable to end

the adjustment.

* The  adjustment  should  be  started  with  "wb  00  00"  and

ended  with  "wb  00  ff",  and  the  offset  should  be  adjusted
when necessary.

5.2.2 Manual adj. method

1) Set TV in Adj. mode using POWER ON
2) Press the ADJ of the R/C to enter into ‘EZ-ADJUST’.
3) Select ‘10.TEST PATTERN’ with the CH +/- key and press

the Enter key for 30 minutes or longer to perform the heat
run.

4) Perform  the  zero  calibration  of  the  Color  Analyzer  and  fix

the  sensor  with  the  10cm  or  less  distance  at  the  center  of
the LCD module surface when adjusting.

5) Press the ADJ of the R/C to select ‘7.White-Balance’ of the

Ez-Adjust and press the right arrow key(

G

) to enter into the

adjustment mode. (As soon as you press ‘

G

’, the screen is

entered into the full white inner pattern.)

6) Fix  one  of  the  R/G/B  gains  to  192  and  decrease  the

remaining two gains to adjust not to exceed 192.

7) The  adjustment  is  done  at  three  white  balances  of  Cool,

Medium and Warm

- 13 -

Co lo r An alyzer

 

Co m p ut er

 

Pat t ern Gen erat o r

 

RS -232C 

RS -232C 

RS -232C 

Probe

Signal Source

* If TV internal pattern is used, not needed

Connection Diagram of Automatic Adjustment

START

6E

50

03

00

CS

LEN

CMD

VAL

STOP

A

A

A

A

A

A

A

A

RS-232C COMMAND

Meaning

[CMD    ID      DATA]

wb

00

00

White Balance adjustment start.

wb

00

10

Start of adjust gain (Inner white pattern)

wb

00

1f

End of gain adjust

wb

00

20

Start of offset adjust(Inner white pattern)

wb

00

2f

End of offset adjust

wb

00

ff

End of White Balance adjust(Inner pattern disappeared)

ITEM

Command

Data Range

Default

(Hex.)

(Decimal)

Cmd 1

Cmd 2

Min

Max

Cool

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

B-Cut

TBD

Medium

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

B-Cut

TBD

Warm

R-Gain

j

d

00

C0

TBD

G-Gain

j

e

00

C0

TBD

B-Gain

j

f

00

C0

TBD

R-Cut

TBD

G-Cut

TBD