LG_50PC46.PDF

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PLASMA TV
SERVICE MANUAL
CHASSIS : PD73A
MODEL : 50PC56
50PC56-ZD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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CONTENTS
SAFETY PRECAUTIONS....................................................................................3
SPECIFICATIONS................................................................................................4
ADJUSTMENT INSTRUCTIONS.........................................................................6
TROUBLE SHOOTING GUIDE..........................................................................19
BLOCK DIAGRAM.............................................................................................29
EXPLODED VIEW..............................................................................................30
EXPLODED VIEW PARTS LIST........................................................................31
REPLACEMENT PARTS LIST...........................................................................32
SCHEMATIC DIAGRAM.........................................................................................
PRINTED CIRCUIT DIAGRAM..............................................................................
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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
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.
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 monitor 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.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
AC Volt-meter
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.
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
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.
To Instrument's
exposed
METALLIC PARTS
0.15uF
1.5 Kohm/10W
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SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement.
V Application Range
This spec is applied to the 50” PLASMA TV used PD73A Chassis.
Chassis
Model Name
Market
Brand
Remark
UK, German, Italy, France, Sweden, Finland, Spain,
PD73A
50PC56-ZD
Netherlands, Belgium, Luxemburg, Greece, Denmark,
LG
Czech, Austria, Poland, Portugal, Norway, Rumania,
Hungary , Bulgaria, Croatia, Serbia, Swiss, Slovenia, Russia
V Specification
Each part is tested as below without special appointment.
1) Temperature : 25±5°C (77±9°F), CST : 40±5
2) Relative Humidity: 65±10%
3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz)
* Standard Voltage of each product is marked by models.
4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.
5) The receiver must be operated for about 20 minutes prior to the adjustment.
V Test Method
1) Performance : LGE TV test method followed.
2) Demanded other specification
Safety : CE, IEC specification
EMC : CE, IEC
Model
Market
Appliance
Remark
UK, German, Italy, France, Sweden, Finland,
Spain, Netherlands, Belgium, Luxemburg,
Safety : IEC/EN60065
50PC56
Greece, Denmark, Czech, Austria, Poland,
EMI : EN55013
TEST
Portugal, Norway, Rumania, Hungary , Bulgaria,
EMS : EN55020
Croatia, Serbia, Swiss, Slovenia, Russia
V General Specification
1. Module Specification ( 50” WXGA MODULE )
No
Item
Specification
Remark
1
Display Screen Device
50” Wide Color Display Module
Plasma Display Panel
2
Aspect Ratio
16:9
3
PDP Module
PDP50X4,
RGB Closed Type, Film Filter
4
Operating Environment
1)Temp. : 0~40deg
2)Humidity : 20~80%
LGE SPEC.
5
Storage Environment
3)Temp. : -20~60deg
4)Humidity : 10~90%
6
Input Voltage
100-240V~, 50/60Hz
Maker LG
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2. Model General Specification
No
Item
Specification
Remark
1
Market
UK, German, Italy, France, Sweden, Finland, Spain,
Analog Only
Netherlands, Belgium, Luxemburg, Greece,
Denmark, Czech, Austria, Poland, Portugal, Norway,
Rumania, Hungary , Bulgaria, Croatia, Serbia, Swiss,
Slovenia, Russia
2
roadcasting system
1) PAL-BG
2) PAL-DK
3) PAL-I,I’
4) DVB-T(ID TV)
5) SECAM-L/L’
3
Receiving system
Analog : Upper Heterodyne
Digital : COFDM
4
Scart Jack (2EA)
PAL, SECAM
5
Video Input (1EA)
PAL, SECAM, NTSC
4 System : PAL, SECAM, NTSC, PAL60
6
S-Video Input (1EA)
PAL, SECAM, NTSC
4 System : PAL, SECAM, NTSC, PAL60
7
Component Input (1EA)
Y/Cb/Cr, Y/Pb/Pr
8
RGB Input(1EA)
RGB-PC
9
HDMI Input(2EA)
HDMI-DTV & SOUND
10
Audio Input (3EA
PC Audio, Component, AV
L/R Input
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