LG CT-29Q24EN Service Manual page 10

Adjusting the VR101(RF AGC) control to one end of rotation
will usually cause a relatively poor signal to noise ratio;
Adjusting to the other end of rotation will usually cause a
degradation of over load capabilities resulting in color beats or
adjacent channel interference. For best results, adjust the
VR101 control while performing on all over local channels, or
the voltage at TP2 will be 2.3!0.1Vdc in RF level 65!1dBuV.
Screen Voltage Adjustment
O
Test Point : CPT Face
Adjust : Screen Control of FBT
NOTE: To enter SVC mode, press "OK" buttons on both TV
set and the Remote control at the same time.
1) Tune the TV set to receive a digital pattern.
2) Press MIX button on remote controller for Service to get
into the Screen Adjust Mode.
3) Adhere the Color Analyzer on the White window of CPT
face.
4) Adjust Screen Volume of FBT so that the luminance of
White window is 42!1 FL.
SCREEN ADJUST MODE
Fig. 2 SVC MODE for SCREEN Adjust
Focus Adjustment
O
NOTE: This adjustment should be performed after warming
up for 10 minutes.
Test Point : Observing Display
Adjust : Focus control of FBT
1) Tune the TV set to receive a digital pattern.
2) Adjust the lower Focus control of FBT for the best focus of
vertical line B.
3) Adjust the upper Focus control of FBT for the best focus of
area A.
4) Repeat above step 2) and 3) for the best overall focus.
White window OSD
A
Deflection Data Adjustment (Line SVC-1)
O
1. Preparation for Deflection Adjustment
1) At SVC mode, press the Yellow colored button.
If the Remote Controller doesn't have the Yellow button,
use the button under the Channel Down(PR
And then, deflection data adjustment OSD (SVC1 mode)
will be displayed.
2) Press Channel UP/DOWN button for desirous function
Adjustment.
3) Press Volume UP/DOWN button to adjust the data.
VL (Vertical Linearity)
Adjust so that the boundary line between upper and lower
half is in accord with geometric horizontal center of the CPT.
VA (Vertical Amplitude)
Adjust so that the circle of a digital circle pattern may be
located within the effective screen of the CPT.
SC (Vertical "S" Correction)
Adjust so that all distance between each horizontal lines
are to be the same.
VS (Vertical Shift)
Adjust so that the horizontal center line of a digital circle
pattern is in accord with geometric horizontal center of
the CPT.
HS (Horizontal Shift)
Adjust so that the vertical center line of a digital circle pattern
is in accord with geometric vertical center of the CPT.
EW (Horizontal Width)
Adjust to that a digital circle pattern looks like exact circle.
EP (East-west Parabolar)
Adjust so that middle portion of the outermost left and right
vertical line looks like parallel with vertical lines of the CPT.
EC (East-west Coner)
Adjust so that the vertical line at every 4 corners of the
screen looks like parallel with the vertical lines of the CPT.
ET (East-west Trapezium)
Adjust to make the length of top horizontal line same with
it of the bottom horizontal line.
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Fig. 3
b
E
) button.
B