Adjustment - LG 14FU7RB Service Manual

1. Scope of Application
These instructions are applied to MC-059D Chassis.
2. Notes
1) Because this is a cold chassis, it is not necessary to use an
isolation transformer. However, operating it using a
transformer between the power supply line and chassis
input to prevent electric shock and to protect the test
instrument.
2) Adjustment must be done in the correct order.
3) The adjustment must be performed in the circumstance of
25°C±5°C of temperature and 65%±10% of relative
humidity if there is no specific designation.
4) The input voltage of the receiver must keep PAL: 100~240V
±10%,50/60Hz (China/Indonesia/Thailand/Vietnam/CIS
market) in adjusting.
5) The receiver must be operated for about 20 minutes prior to
the adjustment.
6) Signal: Receive the standard color signal. (65dB±1dBuV )
PAL/SECAM: LG standard signal means the digital pattern
PAL-B/G 05CH
7) If not specified, APC ON is APC CLEAR. (DYNAMIC)
3. AGC Voltage Adjustment
3-1. Necessary Instrument
- Digital Multi meter : 1 set
- Max Input Current : Over 1A/ Max Input Voltage : 500Vdc
- Measurement Range : 10mV-100mVdc/ Accuracy : 0.03%
3-2. Adjustment Preparation
1) Input LG standard signal 65dB (±1dB) into 75Ω cable.
2) Connect the digital multi-meter to J105. (AGC Check
Marking)

3-3. Adjustment

1) Select the VP 0(RF AGC) adjustment mode by pressing
IN-START key on the SVC remote control.
2) Press VOL +/- (
reading as below:
3) CAUTION:
Since the signal strength can be easily changed by the
condition of signal cable, you need to check the signal
strength frequently in order to prevent error.
Tuner P/N Maker
AGC Vol.
6700MF0014A
LG Innote 2.3±0.05V
6700PF0006B
SANYO 2.3±0.05V
6700MF0018B
LG Innote 2.3±0.05V
4. Screen Voltage Adjustment
4-1. Adjustment
(Use factory Remote Control)
1) Input in the 75Ω cable LG standard signal (Digital
Pattern,480NC)
2) Press the "ADJ' key of factory remote control once to
make TV set display horizontal line.
3) Turn the Screen Vol. on the FBT clockwise to appear
Copyright©2010 LG Electronics.Inc. All right reserved.
Only for training and service purposes.
) key until the muti-meter shows
F , G
Signal Tuner Spec.
TAEW-G013D
65dBu
115-B-A86EL
65dBu
TAEA-G001D
65dBu
ADJUSTMENT
Horizontal Line and turn it counterclockwise until
horizontal line faintly visible.
(Exit screen voltage adjustment by press " Enter (
factory remote control.)
5. Purity and Convergence Adjustment
5-1. Purity Adjustment
(1) Adjustment Preparation
1) Receive Red Raster Pattern for purity adjustment
(51CH).
2) Demagnetize the CPT and Cabinet with a degaussing
coil.
(2) Adjustment
1) Pre-adjust the static convergence (STC) with the 4 and
6-pole magnet.
2) If the horizontal line is inline with CPT Mark, 2-pole
magnet should direct 3-9 o'clock direction.
3) If not, direct 2-pole handle towards 6-12 o'clock direction
and adjust the horizontal line to fall onto the mark
opening the magnet at an angle.
4) Push the DY (deflection yoke) all the way to CPT funnel.
5) Turn the purity magnet (2-pole magnet) so that the
"green" color portion of left side and the blue color
portion on the right side have equal amount of color.
Review <Fig. 1>
6) Pull the DY slowly backward and fix it when the whole
screen becomes red. (The specified torque for fixing DY
screw should be 10Kg/cm). See <Fig. 2>
5-2. Convergency Adjustment
(1) Necessary Instrument
1) Degaussing Coil
2) Convergency fixing instrument (special tools)
(2) Adjustment Preparation
Remark
1) Heat run over 30 minutes before adjustment.
2) Demagnetize the CPT and Cabinet by using degaussing
PAL
coil.
PAL
3) Receive Cross Hatch Pattern for Convergence (09CH).
PAL
4) Let the contrast in normal luminance level.
(3) Static Convergence (STC) Adjustment
1) Receive Cross Hatch Pattern for Convergence (09CH).
2) Adjust the focus first seeing to it that the WHITE color
picture quality is sharp enough.
3) Change the angle between the 2 tabs of 4-pole magnet
until vertical Red and Blue lines are unified.
4) Turning the 2 tabs of 4-pole magnet until horizontal Red
and Blue lines are unified. At this time, do not change
the angle between the 2 tabs.
- 6 -
G
G R B
<Fig. 1>
G R B
<Fig. 2>
) key of
A
R B
R
LGE Internal Use Only