LG BX401C Service Manual page 13

9. CWI/White Balance Measurement
Condition
(1) CWI and White Balance is adjusted using the
measurement of color coordinate. So periodically adjust
within time set and you should provide the replacement
equipment to use the correction.
(2) Adjust the screen size to a minimum of 40 inches.
(3) Place the CL-200 on the center of projection screen.
(4) Make the measurement condition under 1Lux for CL-200
to measure the correct color coordinate.
10. CWI Adjustment
10-1. Setting of the Device
Set the equipment as <Fig. 10-1>.
<Fig. 9> Device Setting Diagram for CWI Adjustment
10-2. Required Test Equipment
(1) Illuminometer (Model : CL-200) 1EA : Chromaticity
measurement from projection screen center.
(2) Set fixing device 1EA
(3) Remote control 1EA
10-3. Preparation for Adjustment
(1) Adjust the Center and Size for next progress.
(2) Select ADJ-> CWI ->
control. (Default value : 270)
(3) After entering into the CWI, press ■ ENTER key at the
adjustment remote control to switch to the Full Red screen
as shown at <Fig. 10-2>. At this time, read X and Y values
270
at the center, the color coordinates of the illuminometer.
<Fig. 10-2> Full RED Pattern
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Illuminometer
Equipment to monitor Lx,X,Y data
Set
Set fixing device
(Vol+) at the adjustment remote
▶
10-4. Adjustment
(1) Adjust CWI to the left/right value by using the volume
buttons at the first adjustment value is preset to 270.
(2) Illuminometer color coordinates is changed when pressing
volume button.
(3) X coordinates usually get maximum value at X=
0.645±0.02 and Y coordinates usually get minimum value
at Y=0.345±0.02. Adjust this value by pressing volume
button on the remote control. Average value is 270.
(4) Check the red pattern whether it is entirely uniform.
(5) Press the Enter key one more time, and then you can
enter to Ramp pattern as shown <fig. 10-3>. At this time,
Check whether each color is linear.
270
<Fig. 10-3> Ramp Pattern
(6) When there is no problem after checking, press 'EXIT' key
at the adjustment remote controller to exit.
11. White Balance(Auto CCA) adjustment
11-1. Required Test Equipment
(1) Illuminometer (Model : CL-200) 1EA
(2) RS-232C Cable 1EA
(3) Set fixing device 1EA
(4) Remote control 1EA
11-2. Equipment Composition
Use the RS232C cable to connect the set and the CL-200 as
shown at <Fig. 11-1> Device Setting Diagram.
<Fig. 12> Device Setting Diagram
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Illuminometer
Equipment to monitor Lx,X,Y data
Set
Set fixing device
LGE Internal Use Only