DOWNLOAD LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual ↓ Size: 9.9 MB | Pages: 43 in PDF or view online for FREE

Model
50PC3DD-UE (CHASSIS:PA73E)
Pages
43
Size
9.9 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
50pc3dd-ue-chassis-pa73e.pdf
Date

LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual ▷ View online

PLASMA TV
SERVICE MANUAL
July,  2007
P/NO : MFL36737209
CHASSIS : PA73E
NS-PDP50
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
- 2 -
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  lsolation  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  circuitary  that  may  be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this monitor is blown, replace
it with the same specified type.
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.
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  positioin,  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  esposed  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 sepcified, 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
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
- 3 -
ADJUSTMENT INSTRUCTIONS ..........................................4
TROUBLESHOOTING GUIDE ............................................14
BLOCK DIAGRAM...............................................................19
EXPLODED VIEW...............................................................24
EXPLODED VIEW PARTS LIST .........................................25
REPLACEMENT PARTS LIST ............................................26
SCHEMATIC DIAGRAM..........................................................
PRINTED CIRCUIT BOARDS .................................................
TABLE OF CONTENTS
- 4 -
ADJUSTMENT INSTRUCTIONS
1. Application Object
These instructions are applied to all of the PDP TV, PA73E.
2. Notes
(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 equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input voltage of the receiver be must kept 110V, 60Hz
when adjusting.
(5) The receiver must be operational for about 15 minutes
prior to the adjustments.  
O
Preliminary action is applied to the test for afterimage
discharge detection, and 100% FULL WHITE PATTERN
must be operated automatically.
1) Pressing Power On key
2) Full Test Pattern(2 min 30sec)
3) Full Black Pattern(30sec) 
4)Full White Pattern 
O
Pattern Mode is deselected by pressing CH +/-, Exit Key.
[
Set is activated HEAT-RUN without signal generator in this
mode.
3. MICOM Download(Option) 
3-1. Required Test Equipment
(1) JIG-LEVER TYPE for adjusting: 1EA
(2) PC & MONITOR: 2EA
(3) BOARD for INTERFACE: IIC & ISP BOARD: 2EA
(4) 15P D-SUB CABLE: 2EA
(5) Using the 12/15 line of D-SUB 15P
12-SDA/15-SCL
3-2. JIG Connection
3-3. Establishment Program
(1) Establish LGE Monitor Tools v1.1
(2) The program work and it is opened program window as
seen below. 
Test Pattern 2min 30sec
Test Pattern 30sec
If you turn on a still screen more than 20 minutes (Especially
Digital pattern(13 CH), Cross Hatch Pattern), an afterimage
may occur in the black level part of the screen.
connection 
to PC
connection 
to PC
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LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual ▷ Download

  • DOWNLOAD LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual ↓ Size: 9.9 MB | Pages: 43 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the LG 50PC3DD-UE (CHASSIS:PA73E) in PDF for free, which will help you to disassemble, recover, fix and repair LG 50PC3DD-UE (CHASSIS:PA73E) Plasma. Information contained in LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.