Adjustment Instructions; Test Equipment Required; Screen Voltage Adjustment; Deflection Data Adjustment - LG CT-29Q90IP Service Manual

¡ Safety Precautions
1. It is safe to adjust after using insulating transformer between
the power supply line and chassis input to prevent the risk of
electric shock and protect the instrument.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances.
5. Unless otherwise noted, set the line voltage to 230Vac¡
10%, 50Hz.
5. The adjustment of TVshould be performed after warming up
for 15 minutes.
¡ Test Equipment required
1. RF signal generator (with pattern generator)
2. DC Power Supply
3. Multimeter (volt meter)
4. Oscilloscope
5. Color analyzer
¡ Focus Adjustment
Test Point : Observing Display
Adjust : Focus control of FBT
1) Tune the TV set to receive a digital pattern.
2) Adjust the upper Focus volume of FBT for the best focus of
vertical line B.
3) Adjust the lower Focus volume of FBT for the best focus of
area A.
4) Repeat above step 2) and 3) for the best overall focus.
A
¡ Screen Voltage Adjustment
1) Turn the TV set on.
2) This adjustment should be performed after warming up for
more than 15 minutes.
3) Enter the SVC mode by pressing the SVC button on remote
controller and make a horizontal line by pressing the H-LINE
button.
4)Finish adjusting at the point when the horizontal line appears
again after adjusting screen volume until the horizontal line
disappear.

ADJUSTMENT INSTRUCTIONS

Fig. 1
b
¡ White Balance Adjustment
NOTE : This adjustment should be performed after screen
voltage adjustment.
1) Tune the TV set to receive an 100% white pattern.
2) Press Channel UP/DOWN button for desirous function
Adjustment.
3) Press Volume UP/DOWN button to adjust the data.
4) Adjust until ÒCONTRASTÓ and ÒBRIGHTÓ become 3.5 Ft_L
5) Enter the SVC mode by pressing the SVC button.
6) Adjust the Y value of High Light with G-DRIVE and adjust the
X value with B-DRIVE until they have the color coordinate of
High Light as below.
7) Adjust until ÒCONTRASTÓ and ÒBRIGHTÓ become 4.5 Ft_L
8) Enter the adjustment mode by pressing the SVC button.
9) Adjust the Y value of Low Light with G-CUTOFF and adjust
the X value with B-CUTOFF until they have the color
coordinate of Low Light as below.
10) Repeat adjusting until the color coordinate of High and Low
Light is satisfied.
11) Check the adjusted color coordinate with a white balance
meter.
Color Tem.
13000K
9000K
Menu
CR
CG
CB
WR
B
WG
WB
¡ Deflection Data Adjustment
1) Deflection Data Adjustment should be performed with the
remote controller for handset.
2) Enter the SVC mode by pressing the SVC button.
3) Enter the Deflection Adjustment mode by pressing the
ADJUST button.
4) Press the Channel UP/DOWN button to select adjustment
items.
5) Press the Volume UP/DOWN button to adjust the data.
6) The TV set receives PAL-B/G Digital pattern.
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.
- 9 -
X
Y
266 ¡ 8 273 ¡ 8
288 ¡ 8 295 ¡ 8
LG 29Ó FLAT
LG 29Ó S/F
Memo
NON EU
EU
LG 32Ó FLAT