DOWNLOAD LG 50PC5D-DB (CHASSIS:PT-73A) Service Manual ↓ Size: 15.34 MB | Pages: 35 in PDF or view online for FREE

Model
50PC5D-DB (CHASSIS:PT-73A)
Pages
35
Size
15.34 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
50pc5d-db-chassis-pt-73a.pdf
Date

LG 50PC5D-DB (CHASSIS:PT-73A) Service Manual ▷ View online

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PT-73A
MODEL : 50PC5D       
50PC5D-DB
- 2 -
CONTENTS
SAFETY PRECAUTIONS  ...................................................................................3
ADJUSTMENT INSTRUCTIONS  ........................................................................4
BLOCK DIAGRAM .............................................................................................10
EXPLODED VIEW ..............................................................................................14
EXPLODED VIEW PARTS LIST ........................................................................15
REPLACEMENT PARTS LIST...........................................................................16
SCHEMATIC DIAGRAM ........................................................................................
PRINTED CIRCUIT BOARD ..................................................................................
- 3 -
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 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.
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
- 4 -
ADJUSTMENT INSTRUCTIONS
1. Application Range
These instructions are applied to all of the PDP TV, PT73A.
2. Specification
(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 to
protect test instruments.
(2) Adjustment must be done in the correct sequence.
(3) The adjustment must be performed at 25°±5°C
temperature and 65°±10% relative humidity if there is no
specified designation.
(4) The input voltage of the receiver must be kept between
100~240V, 50/60Hz.
(5) The receiver must be operated for about 15 minutes prior
to the adjustment.
Ø
After RGB Full White in HEAT-RUN Mode, the receiver
must be operated prior to the adjustment.
Ø
Enter into HEAT-RUN MODE 
1) Press the POWER ON KEY on R/C for adjustment.
2) OSD display and screen display PATTERN MODE.
[
Set is activated HEAT run without signal generator in this
mode. 
[
Single color pattern ( RED / BLUE / GREEN ) of HEAT
RUN MODE uses to check panel. 
3. Channel Memory
3-1. Setting up the LGIDS
(1) Install the LGIDS. (idsinst.exe) 
(2) After installation, restart your PC.
(3) Extract [files.zip] to folder [c:\LGIDS\files] .  
(4) Start LGIDS. 
3-2. Channel Memory Method
(1) Select “PDP” and “Hurricane” on Model dialog. and check
your connection in Communication dialog.
(If your connection is ‘NG’, then set your PORT(COM1,2,3,
...) correctly.
(2) Connect RS232 cable and turn on the power.(Use the
general RS-232C Serial Cable)
(If your connection has completed, you can see                )
[
If your set is not an end products but only a board, you have
to make your board to Stand-by state(LED_R). And you
have to Download in Stand-by power state.
(3) Select proper CH_memory file(*.nvm) for each model at
[NVRAM Download] --> [Write Batch].
Next, select proper binary file(*.bin) including the CH
information for each model at [NVRAM File].
[File name]
: H2_CH_Memory_RZ.nvm
(4) Click the [Download] button.
It means the completion of the CH memory download if all
items show ‘OK’  and Status is changed by ‘PASS’ at the
lower right corner of the window
(5) If you want to check whether the CH information is
memorized correctly or not, click the [Verify] button. 
And then compare NVRAM File(*.bin) with the CH
information downloaded
Caution: If you turn on a still screen more than 20 minutes
(Especially digital pattern, cross hatch pattern), an after image
may be occur in the black level part of the screen 
<Fig. 1>
<Fig. 2>
<Fig. 3>
Page of 35
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LG 50PC5D-DB (CHASSIS:PT-73A) Service Manual ▷ Download

  • DOWNLOAD LG 50PC5D-DB (CHASSIS:PT-73A) Service Manual ↓ Size: 15.34 MB | Pages: 35 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the LG 50PC5D-DB (CHASSIS:PT-73A) in PDF for free, which will help you to disassemble, recover, fix and repair LG 50PC5D-DB (CHASSIS:PT-73A) Plasma. Information contained in LG 50PC5D-DB (CHASSIS:PT-73A) 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.