Color Temperature - LG 47LA790V Service Manual

Chassis : ld34d

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Table of Contents

▪ Adj. Map

Command

Adj. item

(lower caseASCII)

CMD1

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

Warm

B Gain

R Cut

G Cut

4.2.5. Adj. method

(1) Auto adj. 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 to USB)

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

5) When adj. is complete (OK Sign), 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.

(2) Manual adjustment. method

1) Set TV in Adj. mode using POWER ON.

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 → 9. White-

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

right key(►) is pressed 216 Gray internal pattern will be

displayed

4) Adjust Cool modes

a. Fix the one of R/G/B gain to 192 (default data) and

decrease the others. ( If G gain is adjusted over 172

and R and B gain less than 192 , Adjust is O.K.)

b. If G gain is less than 172, Increase G gain by up to

172, and then increase R gain and G gain same

amount of increasing G gain.

c. If R gain or B gain is over 255, Readjust G gain less

than 172, Conform to R gain is 255 or B gain is 255

5) Adjust two modes(Medium/Warm) Fix the one of R/G/B

gain to 192(default data) and decrease the others.

6) Adj. is completed, Exit adjust mode using "EXIT" key on

Remote controller.

▪ If internal pattern is not available, use RF input. In EZ Adj.

menu 6.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 206 Gray pattern.

Only for training and service purposes

Data Range

Default

(Hex.)

(Decimal)

CMD2

MIN

MAX

* CASE Cool

First adjust the coordinate far away from the target

value(x, y).

1. x, y > target

i) Decrease the R, G.

2. x, y < target

i) First decrease the B gain,

3. x > target, y < target

i) First decrease B, so make y a little more than the target.

ii) Adjust x value by decreasing the R

4. x < target, y > target

i) First decrease B, so make x a little more than the target.

ii) Adjust x value by decreasing the G

How to adjust

1. If G gain is adjusted over 172 and R gain and B gain

less than 192 , Adjust is O.K.

2. If G gain is less than 172 , increase G gain by up to

172, and then increase R gain and B gain same

amount of increasing G gain.

3. If R gain or B gain is over 255 , Readjust G gain less

than 172, Conform to R gain is 255 or B gain is 255

* CASE Medium / Warm

First adjust the coordinate far away from the target

value(x, y).

1. x, y > target

i) Decrease the R, G.

2. x, y < target

i) First decrease the B gain,

ii) Decrease the one of the others.

3. x > target, y < target

i) First decrease B, so make y a little more than the target.

ii) Adjust x value by decreasing the R

4. x < target, y > target

i) First decrease B, so make x a little more than the target.

ii) Adjust y value by decreasing the G

▪ 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°)

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.

4.2.6. Reference (White balance Adj. coordinate and