LG Electronics 425030, 425010, 425020 service manual Adjusting the White Balance, How to adjust

5. Adjusting the White Balance

5.1 Overview

-Purpose and principle for adjusting the white balance

-Purpose : Adjust the white balance to reduce the deviation of the module.

-Principle: The full dynamic range of the module when the RGB gain on the OSD is 192. In order to adjust the white balance with no saturation of the full dynamic range and the data, fix one of the RGB gains to 192 and decrease the remaining two gains to adjust

5.2 Device to use

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

2)Computer to adjust (needed for the automatic adjustment, possible to communicate with the RS-232C)

3)Adjustment remote controller

4)Video Signal Generator MSPG-925F 720p/216Gray (Model:217, Pattern:78)

=> Applied only when the inner pattern cannot be used

*Use the Color Analyzer with the matrix calibrated by the CS- 1000

5.3 Measuring instrument wiring diagram

5.4RS-232C Command used for the automatic adjustment

-"wb 00 00": Start Auto-adjustment of white balance.

-"wb 00 10": Start Gain Adjustment (Inner pattern)

-"jb 00 c0" :

-…

-"wb 00 1f": End of Adjustment

*If it needs, offset adjustment (wb 00 20-start, wb 00 2f- end)

-"wb 00 ff": End of white balance adjustment (inner pattern disappear)

6. How to adjust

6.1 How to adjust automatically

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.

6.2 How to adjust manually

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

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.

*The inner pattern is basically used, and if it is not possible, the adjustment can be done by selecting the HDMI input. NONE, INNER or HDMI can be selected by the bottom option at the Ez Adjust Menu 7.White Balance menu and it is set to INNER as default. If the adjustment cannot be done by the inner pattern, select the HDMI to adjust.

*Adjustment environment and reference

1)Environment illuminance

Adjust it to 10 LUX or less at the place where the light source such as lamp should be blocked at maximum.

2)Probe location

-PDP: Locate the Color Analyzer (CA-100, CA-100+, CA210) close to the module surface to measure and adjust

-LCD: Maintain the Color Analyzer (CA-210) close to the module surface by 10cm or less and keep the probe of the Color Analyzer perpendicular to the module surface (80°~ 100°).

3)Aging time

-Keep the power on after the aging start (with no power off) to perform the heat run for 15 minutes or longer.

-Keep the white pattern with the inner pattern for the PDP.

-For the LCD, make sure that the back light is turned on by using no signal and the full white pattern or others.