LG 21FG5RG, Service Manual

- 7 -

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) CRTColor Analyzer, CA -100: 1 set
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 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 “MUTE” key of factory
remote control after adjustment finished.

* In case there is excess RED color at screen voltage

adjustment, adjust it using “volume - (

F

) key of factory remote

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 of factory remote control.

3) Use the CH

D

, CH

E

Key to choose adjustment item.

4) Use the VOL

F

, VOL

G

Key to change item data.

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 and Y data of

high light with B-DRIVE to have the color temperature
as shown below.

c. Make the picture luminance 4.5Ft-L by changing the

“CONTRAST” and “BRIGHTNESS”.

d. Adjust X data of low light with R-BIAS and Y data of low

light with B-BIAS to have the color temperature as
shown below.

e. Repeat steps a~d until both low and high light have the

same readings as shown below.

7. Focus Voltage Adjustment

This adjustment must be done after operating the TV set
receiver sufficiently.

7-1. Adjustment Preparation

Receive the LG standard pattern (PAL: 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 (Fig. 1(a)) and horizontal line (Fig.
1(b)) as shown below.

8. SUB-BRIGHTNESS Adjustment

This adjustment must be done after White balance adjustment.

8-1. Adjustment Preparation

1) Receive PAL B/G 5CH pattern.
2) Set the picture condition on “PSM ON” (DYNAMIC) 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

F

,

VOL

G

key so that the 1th, 2th black level in gray scale of

PAL B/G 05CH pattern have a little bit of difference.
(See Fig. 2)

Market         Color Temperature        X-AXIS          Y-AXIS

ALL                   13,000                    268±5            273±5

(a)

(b)

<Fig. 1>

<Fig. 2> PAL B/G 05CH Signal

1th VS 2th

BLACK LEVEL have a bit of difference.

(In case of Vietnam Model 2th VS 3th)

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Only for training and service purposes.

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