LG 29FU1RLX, Service Manual

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1. Application Object
This specification can be applied to all the television related to
CW62C 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)All adjustments must be done in correct sequence.
However, for better productivity, it can be changed in a pre-
permitted range.
(3) Environment conditions: If not specified, it must be done in
following conditions.
1) Temperature: 25±5°C
2) Humidity : 65±10%
(4) AC Voltage 220V ±10%
(5) If not specified, the receiver must be operated for more
than 20 minutes prior to the adjustment.
(6) Signal: Received the standard color signal. (65dB±1dBuV)
PAL/SECAM: LG standard signal means the digital
pattern PAL_EU 05CH
3. Adjust Item
3.1.1. Preparation for Adjustment.
- Receive PAL-B/G 07ch.(Cross hatch pattern) likes fig.1.
- Select the Picture mode to Standard or clear.
3.1.2. Adjustment.1
Adjust FOCUS VOLUME(the top volume of FBT) ¨and
make the FOCUS of vertical line on the quarter of
screen(red area in fig.1) achieve the best state.
3.2. Purity and Convergence adjustment
Following direction is a case using of None-ITC CPT for CPT
manufacture factory.
This adjustment should be done as below direction.
3.2.1. Purity adjustment
a. Do degauss CPT and Cabinet
b. Receive Red Raster signal. (Gumi PG50ch.)
c. Unfasten fixing Screw of DY, close DY to CPT Funnel DY
as possible as you can.
d. Make R-Land be centered as cross Purity Magnet
That time,4th 6th magnet should keep free gauss status.
e. Make uniform RED Raster as moving DY,
Check there is purity problem or not on R/G/B, white
Raster.Then, Fix screw of DY.
(At this time, be careful about inclination and DY should be
fixed keeping horizontality)
f. Check the TV in direction of EAST, WEST, SOUTH,
NORTH,. Adjust with supporting MAGNET when
adjustment is not operated ..
3.2.2. Adjustment for Convergence
This adjustment should be operated at the best condition of
FOCUS after finishing the PURITY adjustment.
1) BACK RASTER receives black CROSS HATCH signal.
2) Adjust Brightness so that there are 9-12 dots.
3) Widen two tabs of 4pole Magnet with equal angles and
accord red, blue vertical lines at the center of screen.
4) With keeping angle of "c. clause", rotate tab and accord
red/blue, green vertical lines at the center of screen.
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ADJUSTMENT INSTRUCTIONS
A B
<Fig 1. Cross-Hatch Pattern(NTSC:US 09CH, PAL:E-7 CH)
Integrate DY and
Magnet into CPT
CPT Assembly
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.
It needs minimum 15 minutes for
heat run under "standard" picture
condition.
DY FIXED Torque 9~11 kg f.cm
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 Pre-Adjustment
Purity adjustment
DY Fixing
SCREEN Voltage adj.
W/B Fix
FOCUS adjustment
STC adujustment
DYC adujustment
Convergence Magnet
15 ~ 20mm
6Pole 4 2
Fig.2 Adjustment Sequence