21FS2RLX-ZC Datasheet PDF - LG

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21FS2RLX-ZC
LG

Part Number 21FS2RLX-ZC
Description Color TV Service Manual
Page 30 Pages


21FS2RLX-ZC datasheet pdf
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COLOR TV
SERVICE MANUAL
CHASSIS : MC-049C
MODEL : 21FS2RLX
MODEL : 21FS2RLX-ZC
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.



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CONTENTS
Contents ...................................................................................................................2
Safety Precautions..............................................................................................3
Control Descriptions..........................................................................................4
Specifications ........................................................................................................7
Adjustment Instructions .................................................................................8
Trouble Shooting.................................................................................................12
Printed circuit board.........................................................................................16
Block Diagram ......................................................................................................18
Exploded View....................................................................................................20
Exploded View Parts List ..............................................................................21
Replacement Parts List .................................................................................22
SVC. Sheet..................................................................................................................
-2-



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SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
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:
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.
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 1MΩ and 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
AC Volt-meter
To Instrument’s
exposed
METALLIC PARTS
0.15uF
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
-3-
1.5 Kohm/10W



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DESCRIPTION OF CONTROLS
All the functions can be controlled with the remote control handset.
Some functions can also be adjusted with the buttons on the front
panel of the set.
Remote control handset
Before you use the remote control handset, please install the bat-
teries. See the next page.
1. POWER
POWER
MUTE
switches the set on from standby or off to standby.
1 11
12 3
2. NUMBER BUTTONS
switches the set on from standby or directly select a number.
45 6
2
3. MENU (or INDEX)
78 9
selects a menu.
selects an index page in the teletext mode (only TELETEXT
MENU/INDEX 0
TV/AV
models). (option)
3 12
i
4
EYE/
TV
I / II /
*4. EYE/ (option)
13 switches the eye function on or off.
PR ( )
5. D / E (Programme Up/Down)
5
VOL OK
VOL
selects a programme or a menu item.
switches the set on from standby.
PR ( )
scans programmes automatically.
Q.VIEW
LIST
F / G (Volume Up/Down)
6 14 adjusts the volume.
TEXT/MIX/ SIZE/
HOLD/
7
UPDATE/ X TIME/ REVEAL/ ?
adjusts menu settings.
OK
accepts your selection or displays the current mode.
8
PSM
SSM/
SLEEP/ M
FAVOURITE PICTURE SOUND
15 6.
16
Q.VIEW
returns to the previously viewed programme.
9 17
TURBO/
/
7. TELETEXT BUTTONS (option)
10 These buttons are used for teletext.
For further details, see the ‘Teletext’ section.
8. PSM (Picture Status Memory)
recalls your preferred picture setting.
(With TELETEXT)
9. FAVOURITE
selects a favorite programme.
10. TURBO PICTURE / SOUND BUTTON (option)
selects Turbo picture and sound.
-4-



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LG
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