White Balance Adjustment - LG 14FU7RB Service Manual

5) Converge the R,G,B vertical line in unity by changing the
angle between the 2 tabs of the 6-pole magnet.
6) Converge the R,G,B horizontal line in unity by turning the
2 tabs of the 6-pole magnet. At this time, do not change
the angle between the 2 tabs.
(4) Dynamic Convergence (DYC) Adjustment
1) Y-Axis Adjustment : Adjust by moving DY right and left
2) X-Axis Adjustment : Adjust by moving DY up and down.
5-3. Block Diagram
Adjustment fundermental is before CPT factory without ITC
adjustment, need according to below order.
CPT Assembly
DY and Magnet
assembled
Heat Run
Degaussing
STC Adjustment
Purity Adjustment
DY Fix
SCREEN Voltage ADJ
W/B Fix
FOCUS ADJ.
STC ADJ.
DYC ADJ.

6. White Balance Adjustment

6-1. Necessary Instrument
1) Automatic White Balance Meter (Low/High Light Pattern
generator)
2) CRT Color Analyzer, CA-100: 1set
3) Factory Remote Control
6-2. Adjustment Preparation
Copyright©2010 LG Electronics.Inc. All right reserved.
Only for training and service purposes.
Before CPT assembly, on CPT
NECK and DY, adhibit TAPE on
CPT contact part.
TAPE need OVER-LAPPING ,
parallel with NECK
Magnet place
DY adjustment, can not engender
CPT neck shadow.
Convergence Magnet
6pole 4
15 ~ 20mm
STANDARD
more than 15 min Heat-Run
DY FIX Torque 9 ~ 11Kg f.cm
Prior to this adjustment, the Screen Voltage adjustment
should be finished.
6-3. Automatic Adjustment
1) Adjust using Automatic White Balance Meter.
2) Enter CPU OFF Mode by press "IN-START" & "MUTE"
key of factory remote control in turn before adjustment.
After finishing adjustment, press the TV/AV key to exit.
*In case there is excess RED color at screen voltage
adjustment, adjust it using "VOLUME -(
control until the RED color disappear.
6-4. Manual Adjustment
1) Adjust using white Balance meter and Factory Remote
controller.
2) Enter white balance adjustment mode by pressing
"INSTART" key of factory remote control.
3) Use the CH
4) Use the VOL
5) Adjustment Procedure
a. Make the picture luminance 45Ft-L by changing the
"CONTRAST" and "BRIGHTNESS".
b. Adjust X data of high light with R-DRIVE(VP7) and Y
data of high light with B-DRIVE(VP9) to have the color
temperature as shown below.
c. Make the picture luminance 4.5Ft-L by changing the
2
"CONTRAST" and "BRIGHTNESS".
d. Adjust X data of low light with R-BIAS(VP4) and Y data
of low light with B-BIAS(VP6) to have the color
temperature as shown below.
e. Repeat steps a~d until both low and high light have
same readings as shown below.
Market Color Temperature X-AXIS Y-AXIS
PAL 12,000°K
7. Focus Voltage Adjustment
This adjustment must be done after operating the TV set
receiver sufficiently.
7-1. Adjustment Preparation
Received LG standard pattern (Digital Pattern, 480NC,13CH)
and set the picture condition on " APC ON" (CLEAR) mode.
7-2. Adjustment
Turn the focus volume on the FBT upper direction to have the
best focus vertical line and horizontal line as below:
- 7 -
D E
, CH Key to choose adjustment item.
F G
, VOL Key to change item data.
268±3 273±3 Auto white balance meter standard
<Fig. 3>
LGE Internal Use Only
)" key of remote
F
Remark