White Balance Adjustment; Equipment Connection Map; Adj. Command (Protocol) - LG 42LB65 Series Service Manual

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4.2. White Balance Adjustment

4.2.1. Overview

▪ 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) Adjustment condition : normal temperature

1) Surrounding Temperature : 25 °C ± 5 °C

2) Surrounding Humidity : 20 % ~ 80 %

4.2.2. Equipment

(1) Color Analyzer: CA-210 (LED Module : CH 14)

(2) Adjustment Computer(During auto adj., RS-232C protocol

is needed)

(3) Adjustment Remote control

(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.

4.2.3. Equipment connection MAP

Probe

USB to RS-232C

* If TV internal pattern is used, not needed

4.2.4. Adj. Command (Protocol)

START 6E

A LEN A 03 A

- 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]

▪ RS-232C Command used during auto-adjustment.

RS-232C COMMAND

[CMD

DATA]

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. completed

*(wb 00 20(Start), wb 00 2f(end)) → Off-set adj.

wb 00 ff → End white balance auto-adj.

Only for training and service purposes

Color Analyzer

RS-232C

Computer

RS-232C

* Pattern Generator

Signal Source

CMD

VAL

Explanation

Begin White Balance adjustment

Gain adjustment(internal white pattern)

Gain adjustment completed

Offset adjustment(internal white pattern)

Offset adjustment completed

End White Balance adjustment

(internal pattern disappears )

▪ Adj. Map

Applied Model : LD42B Chassis ALL MODELS

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

4.2.5. Adj. method

(1) Auto adj. method

1) Set TV in adj. mode using P-Only key.

2) Zero calibrate probe then place it on the center of the

Display.

3) Connect Cable.(RS-232C to USB)

4) Select mode in adj. Program and begin adj.

5) When adj. is complete (OK Sign), check adj. status pre

mode. (Cool, Medium, Warm)

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.

CS STOP

(2) Manual adjustment. method

1) Set TV in Adj. mode using P-Only key.

2) Zero Calibrate the probe of Color Analyzer, then place it

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

3) Press ADJ key → EZ adjust using adj. R/C → 7. White-

Balance then press the cursor to the right(key ►).

(When right key(►) is pressed 204 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) Adjustment 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 204 Gray pattern.

▪ Adjustment 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 10 cm

and perpendicular of the module surface (80° ~ 100°)

- 16 -

Command

Data Range

(lower caseASCII)

(Hex.)

CMD1

CMD2

MIN

MAX

LGE Internal Use Only

Default

(Decimal)

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White Balance Adjustment; Equipment Connection Map; Adj. Command (Protocol) - LG 42LB65 Series Service Manual

4.2. White Balance Adjustment

4.2.3. Equipment connection MAP

4.2.4. Adj. Command (Protocol)

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