LG PT-43, Service Manual

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Caution :
1.Because this is not a hot chassis, it is not necessary to use an
isolation transformer.
However, the use of isolation transformer will help protect
test instrument.
2.Adjustment must be done in the correct order.
3.The receiver must be operated for about 60 minutes proir to
the adjustment.
Pre-heatrun must be operated receiving moving pictures or
100% white pattern.
¡
Raster Slant/Focus Adjustment
1. Preliminary steps
1) The lens focus and electrical focus must be provisional
alignment.
2) Tune the TV set to receive a EU 05 CH.
3) Press the buttons of Remote Controller for adjustment (SVC
$
$
5
$
OK
$
) to reset the convergence.
2. Adjustment
1) Set only green to be appeared on the screen.
2) Carefully rotate the DY of the green CRT so that the slant of
raster become the following figure.
3) Set two color (R or B and G) to be appeared on the screen.
4) Set the slant of Red or Blue correspond to the green.
Note)
O
Beam Alignment Adjustment
1. Test Equipment
Signal Generator can produce DOT pattern
2. Preliminary steps
1) Heat run over 60 minutes.
2) Pre-adjust Raster slope,Raster position & Lens focus.
3) Check if the Magnet is located 45mm from the end of CRT.
4) Receive DOT pattern.
3. 2-Pole Magnet Adjustment
1) Make Green raster using lens cover.
2) Check the center position of DOT pattern on the center of
the screen after turning Green focus volume left.
3) Turning green focus volume right and adjust 2-Pole magnet
so the position to coincide that of item 2).
4) Ajust not to shift the screen by turning green focus volume
left & right.
5) If the screen shifts, readjust 2)~4).
6) Do the same method in Red and Blue. Here, be careful not
to be stained.
4. Beam Shape (4 & 6-Pole Magnet) Adjustment
1) Do after 2-Pole magnet adjustment.
2) Make Green raster using lens cover and turn the focus
volume right.
3) Make the dot in the center a perfect circle using 4 & 6-Pole
magnet.
4) Do the same method in Red & Blue.
5) Fasten the Magnet after adjustment.
6) Adjust focus accurately.
O
Centering Magnet Adjustment
1. Preliminary steps
1) Tune the TV set to receive a EU 05 CH.
2) Press the buttons of Remote Controller for adjustment (SVC
$
$
5
$
OK
$
) to reset the convergence.
2. Adjustment
1)
LG Convergence assy
Make red raster using lens cover and coincide
horizontal/vertical center lines of pattern with those of
screen.
2)
SGS-THOMSON Convergence assy
Adjust until the center of blue signal is shifted upto 30mm left
from that of green signal and center of red signal is shifted
upto 30mm right from that of green signal with turning the
centring magnet.
3) After adjusting, recover original convergence data.
ADJUSTMENT INSTRUCTIONS
L
L
Mechanical
center
1. Tighten the tightening iron after loose completely.
tighten iron which fixing DY when adjusting raster
slant and set position.
2. Never control to the tightening iron which fixed,
it's condition is not untied.
2 Pole Magnet
4 Pole Magnet
6 Pole Magnet
45mm
L
¡´
2mm
M
M
M
M M
M