LG Lafinion 82W, Service Manual

Page: 8 / 42

1.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 220Vac
!
10%.
5. The adjustment of TV should be performed after warming up
for 15 minutes.
2.DVCO Adjustment
1) This is for adjustment of VPC9407,crystal oscillator frequency
after receiving a company Digital pattern. (PAL:EU05CH)
2) When entering adjustment mode by pressing IN-START
key,DVCO adjustment is operating automatically.
(T/X doesn’t operating occasionally during DVCO
adjustment.)
3. Focus Adjustment
3-1. Preparation for Adjustment
Tune the TV set to receive a digital pattern(PAL-B/G 05ch).
3-2. Adjustment Method
1) Adjust the lower Focus volume of FBT for the best focus of
vertical line B.
2) Adjust the upper Focus volume of FBT for the best focus of
area A.
3) Repeat above step 1) and 2) for the best overall focus.
4. Purity & convergence Adjustment
4-1. Preparation for Adjustment
Adjustment should be operated when using the CPT(without
ITC from CPT manufacturing place)
*This adjustment must follow the sequence as shown picture
below.
4-2. Purity Adjustment
1) Degauss the CPT and CABINET enough.
2) Receive red RASTER signal.(PG50ch)
3) Remove fixing screw of DY and stick DY to opening part(CPT
FUNNEL part)
4) Make crossing adjustment to the Magnet of CPT and make
the R-land is placed on center correctly. At this moment, 4
pole and 6 pole magnet should be at the position of no
magnetic field.
5) Move DY and make whole screen to be equal red, and fix the
DY with fixing SCREW after checking color pollution in each
single color and white RASTER of green/blue/red.(At this
time, be careful about inclination and DY should be fixed
keeping horizontality.)
6) Check the receiver in direction of East, West, South, North.
Adjust with supporting MAGNET when adjustment is not
operated.
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ADJUSTMENT INSTRUCTIONS
b
A
B
Fig. 1
Assembling DY to CPT
CPT Assembling As preparatory operations before
assembling CPT, wind cotton Tape for
protecting to CPT NECK and DY, CPT
connection parts. At this moment, end of
tape should be over-lapped and wound in
direct route to the NECK.
Let the screen Standard condition. Operate
Heat-Run at least 15 minutes.
Torque is to be 9-11 kg f.cm when fixing
DY.
Fix the Magnet to the position as shown
picture below. Be careful not to make CPT
neck shadow while adjusting DY.
HEAT RUN
Degaussing
STC Adjustment
PURITY Adjustment
DY Fixing
SCREEN Voltage adj.
W/B Fixing
FOCUS not yet ADJ.
STC not yet ADJ.
DYC not yet ADJ.
6pole 4 2
F
F
15 ~ 20mm