LG 21FU6RLX User manual

COLOR TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/ Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Sep., 2008
Printed in ChinaP/NO.: MFL51851001
CHASSIS : CW62E
MODEL: 21FU6RLX
MODEL: 21FU6RLX-T8
Internal Use Only

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CONTENTS
Contents ....................................................................................................2
Safety Precautions....................................................................................3
Control Descriptions ................................................................................4
Specifications............................................................................................7
Adjustment Instructions...........................................................................8
SVC Remocon.........................................................................................13
Trouble Shooting ....................................................................................14
Printed circuit board...............................................................................17
Block Diagram.........................................................................................19
Exploded View.........................................................................................20
SVC. Sheet...................................................................................................
Copyright©2008 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only

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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube. Do not
lift the Picture tube by it's Neck.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accurate high
impedance HV meter.
Adjust brightness, color, contrast controls to minimum.
Measure the high voltage.
The meter reading should indicate
23.5 ± 1.5KV: 14-19 inch, 26 ± 1.5KV: 19-21 inch,
29.0 ± 1.5KV: 25-29 inch, 30.0 ± 1.5KV: 32 inch
If the meter indication is out of tolerance, immediate service and
correction is required to prevent the possibility of premature
component failure.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
The source of X-RAY RADIATION in this TV receiver is the High
Voltage Section and the Picture Tube.
For continued X-RAY RADIATION protection, the replacement
tube must be the same type tube as specified in the
Replacement Parts List.
1.5 Kohm/10W
To Instrument’s
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
Copyright©2008 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only

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SPECIFICATIONS
Note : Specification and others are subject to change without notice for improvement.
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Application Range.
This spec sheet is applied to the CW62E chassis.
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Specification
Each part is tested as below without special appointment.
1) Temperature : 25°C
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5°C
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F), CST: 40
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2) Relative Humidity : 65
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10%
3)Power Voltage : Standard input voltage
100 ~ 240V~ 50/60Hz
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Standard Voltage of each products is marked by models.
4)Specification and performance of each parts are followed .
each drawing and specification by part number in
accordance with BOM .
5) The receiver must be operated for about 20 minutes prior
to the adjustment.
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Test method
No
1
2
3
4
5
6
7
8
9
10
Item
Receiving System
Available Channel
Input Voltage
Market
Screen Size
Aspect Ratio
Display Method
Tuning System
Operating Environment
Storage Environment
Remark
Korea
L.America/ Philippine
Taiwan
China / Indonesia/ Thai/ Vietnam
EU
CIS, Non EU
PAL Model
N-EU, Latin America
EU
NTSC Model
PAL Model
Specification
NTSC M (AV 3.58)
PAL N/M, NTSC M(AV 3.58)
PAL BG,DK,I/NTSC M(AV 3.58/4.43)
PAL/SECAM BG/DK,PAL I
SECAM DK,NTSC M/4.43,PAL BG DK
VHF : E2 ~ E12
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21 ~ S41
AC 100~240V 50/60Hz
AC 230Vac 50Hz
Latin America, China, Indonesia
Philipines,Taiwan, Thai,Vietnam,CIS
21inch (US)
4:3
CRT
FS
FVS 100Promgram
1) Temp : 0 ~ 40 deg
2) Humidity : 85 % Under
1) Temp : -20 ~ 60 deg
2) Humidity : 85 % Under
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General Specification
Copyright©2008 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only
Market
N-EU
EU/CIS
Compliance
CCC Safety : K60065
Safety : CB [K60065]
EMC : CE [EN55020,EN55013]
Appliance
110 ~ 240Vac, 50/60Hz
230Vac, 50Hz

1. Application Object
These adjustment instructions are applied to CW62E chassis.
2. Notes
(1) Because this is a cold chassis, it is not necessary to use
an isolation transformer.But, operate 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 the better productivity, it can be changed in
pre-permitted range.
(3) Environment conditions: If not specified, it must be done in
following conditions.
1) Temperature : 25°C ± 5°C
2)Humidity : 65% ± 10%
(4) Power supply of a SET which is adjusted is
(100~240V) ±10% AC, 50~60Hz
(5) If not specified, the receiver must be operated for more
than 20 minutes prior to the adjustment.
(6)Signal : Receive the standard color signal. (65dB ±1dB uV)
LG standard signal means the digital pattern
(PAL_EU 05CH)
3. Adjustment
3.1 Focus adjustment
3.1.1. Preperation
a. Receive the Cross-Hatch Pattern(Fig. 1) and Set the picture
condition on DYNAMIC Mode or APC CLEAR mode
3.1.2. Adjustment 1
Adjust the FOCUS VOLUME of FBT for the Best focus of
vertical line
3.2 Focus adjustment
Following direction is a case using of None-ITC CPT for CPT
manufacture factory.
This adjustment shoule be done as below direction.
3.2.1. Purity Adjustment
a. Do degauss CPT and Cabinet
b. Receive the RED Raster Pattern for purity adjustment.(11CH).
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. Convergence Adjustment
This adjustment should be operated at the best condition of
FOCUS after finishing the PURITY adjustment.
a. BACK RASTER receives black CROSS HATCH signal.
b. Adjust Brightness so that there are 9-12 dots.
c. Widen two tabs of 4pole Magnet with equal angles and accord
red, blue vertical lines at the center of screen.
d. With keeping angle of "c. clause", rotate tab and accord
red/blue, green vertical lines at the center of screen
e. Widen two tabs of 6pole Magnet with equal angles and accord
red, blue vertical lines at the center of screen
f. With keeping angle of "e. clause", repeat the adjustment from c
to e keeping in mind the movement of red,blue, green when the
horizontal lines are twisted
- 5 -
ADJUSTMENT INSTRUCTIONS
AB
<Fig. 1> Cross-Hatch Pattern (NTSC : US 09CH, PAL : E-7CH)
Assembling DY and
Magnet
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.
Torque is 9~11 Kg f.cm when DY is
Fixed.
Fix the Magnet to the position as
shown picture below. Be careful not to
make CPT neck shadow while
adjusting DY.
HEAT RUN
Degaussing
Pre STC Adjust
Adjust Purity
Fix DY.
SCREEN Adjustment
Fix W/B
Adjust Focus
Adjust STC
Adjust DYC
Convergence Magnet
15 ~ 20mm
6Pole 42
Copyright©2008 LG Electronics.Inc. All right reserved.
Only for training and service purposes. LGE Internal Use Only