White Balance Adjustment - LG 21FS7RG Service Manual

(3) Static Convergence (STC) Adjustment
1) Receive the Cross Hatch Pattern Convergence(09ch).
2) Before adjusting Static Convergence(STC), adjust the
focus first seeing to it that the WHITE color picture quality
is sharp enough.
3) Converge the RED vertical and BLUE vertical line in
unity(same line) by changing the angle between the 2
tabs of 4-pole magnet.
4) Converge the RED horizontal and BLUE horizontal line in
unity(same line) by turning the 2 tabs of the 4-pole
magnet. At this time, do not change the angle between
the 2 tabs.
5) Converge the R, G, B vertical line in unity(same line) by
changing the angle between the 2 tabs of the 6-pole
magnet.
6) Converge the R, G, B horizontal line in unity(same line) 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 convergence of Y-axis(vertical) by moving the
deflection yoke(DY) left and right.
2) X-axis Adjustment
: Adjust convergence of X-axis(horizontal) by moving the
deflection yoke(DY) up and down.

6. White Balance Adjustment

6-1. Necessary Instrument
1) Automatic White Balance Meter(Low/High light Pattern
generator)
2) White Balance meter(CRT Color Analyzer, CA-100) :1set
3) Factory Remote Control
6-2. Adjustment Preparation
: Prior to this adjustment, the Screen Voltage adjustment
should be finished.
6-3. Automatic adjustment
1) Adjust the using Auto White Balance Meter.
2) Enter CPU OFF Mode by pressing "IN-START" & "MUTE"
key of factor remote control in turn before adjustment.
Exit CPU OFF mode by press the "TV/AV" key of factory
remote control after adjustment finished.
* 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
control.
2) Enter white balance adjustment mode by pressing
"INSTART" key
D E
3) Use the CH , CH
F
4) Use the VOL , 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 with B-DRIVE(VP9) to have the color temperature
as shown below.
Copyright©2007 LG Electronics.Inc. All right reserved.
Only for training and service purposes.
F
) key of factory remote
Key to choose adjustment item.
G
Key to change item data.
c. Make the picture luminance 4.5Ft-L by changing the
"CONTRAST" and "BRIGHTNESS".
d. Adjust X data of low light with R-BIAS(VP4) and Y data
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
PAL/SECAM
7. Focus Voltage Adjustment
This adjustment must be done after operating the TV set
receiver sufficiently.
7-1. Adjustment Preparation
1) Receive Digital pattern and Set the picture condition on
"APC ON"(CLEAR) mode.
7-2. Adjustment
Turn the focus volume on the FBT upper direction th have
the best focus vertical line(figure 1.(a)) and horizontal line
(figure 1(b)) as shown below.
8. SUB-BRIGHTNESS Adjustment
This adjustment must be done after White balance adjustment.
8-1. Adjustment Preparation
1) Receive the LG standard Mono scope pattern(CH14).
2) Set the picture condition on "APC ON"(CLEAR) mode.
8-2. Adjustment
1) Press the "ADJ"key of the factory remote control twice to
enter to "SUB-BRIGHTNESS" adjustment mode.
2) Change the Sub-Brightness data by pressing the VOL
G
VOL key so that the number 1 in gray scale of mono
scope pattern almost disappear.(See figure 2)
0 1
<Fig. 2> MONO SCOPE Pattern signal
8-3. Sub-Tint adjustment
This adjustment has to be done only if the picture has bad tint
otherwise, it can be omitted if the picture has good tint.
1) Receive LG standard pattern signal(SMPTE, 2CH)
2) Set the picture condition on "APC ON"(CLEAR) mode.
- 9 -
Color Temperature X-AXIS
12,000±800 0.270±0.003 0.283±0.003
<Fig. 1>
2 3 4 5 6 7 8 9
LGE Internal Use Only
Y-AXIS
F
,
Gray Scale
Color Bar