50PN4503-ZA, 50PN450B-ZA (CHASSIS:PD31A) - LG TV Service Manual (repair manual)

Model
50PN4503-ZA 50PN450B-ZA (CHASSIS:PD31A)
Pages
36
Size
6.99 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
50pn4503-za-50pn450b-za-chassis-pd31a.pdf
Date

View LG 50PN4503-ZA / 50PN450B-ZA (CHASSIS:PD31A) Service Manual online

P/NO : MFL67682006 (1301-REV00)
CHASSIS : PD31A
MODEL : 50PN450B   
50PN450B-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
PLASMA TV
SERVICE MANUAL
- 2 -
CONTENTS
CONTENTS  .............................................................................................. 2
SAFETY PRECAUTIONS  ........................................................................ 3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ................................................................ 6
BLOCK DIAGRAM .................................................................................. 14
EXPLODED VIEW  .................................................................................. 15
SCHEMATIC CIRCUIT DIAGRAM  ..............................................................
- 3 -
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by      in the 
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent 
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 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
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 1 M
Ω and 5.2 MΩ. 
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 1.5 K / 10 watt resistor in parallel with a 0.15 uF 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 
0.5 mA.
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
IMPORTANT SAFETY NOTICE
To Instrument's
exposed 
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
SAFETY PRECAUTIONS
- 4 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This spec sheet is applied all of the PDP TV with PD31A chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
(2) Relative Humidity: 65 % ± 10 %
(3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* 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 5 minutes prior to the adjustment.
3. Test method
(1) Performance: LGE TV test method followed 
(2) Demanded other specification 
- Safety : CE, IEC specification
- EMC : CE, IEC
4. Module General Specification
- 50" 2D HD 
No
Item
Specification
Remark
1
Display Screen Device
127 cm (50 inch) wide Color Display Module
PDP
2
Aspect Ratio
16:9
3
PDP Module
PDP50T5####, 
RGB Closed (Well) Type, Glass Filter (38%)
Pixel Format: 1024 horiz. By 768 ver.
4
Operating Environment 1) Temp. : 0 ~ 40 deg
2) Humidity : 20 ~ 80%
LGE SPEC
5
Storage Environment
1) Temp. : -20 ~ 60 deg
2) Humidity : 10 ~ 90 %
6
Input Voltage
AC100 ~ 240V, 50/60Hz
Maker LG
- 5 -
No
Item
Specification
Remark
1
Market
Albania, Austria, Belgium, Bosnia, Bulgaria, Coratia, 
Czech, Denmark, Estonia, Finland, France, Germany, 
Greece, Hungary, Ireland, Italy, Kazakhstan, Latvia, 
Lithuania, Luxembourg, Morocco, Netherlands, 
Norway, Poland, Portugal, Romania, Russia, Serbia, 
Slovenia, Spain, Sweden, Slovakia, Switzerland, 
Turkey, Ukraine, UK
36 Country
Australia, New Zealand, Malaysia, Indonesia, 
Non-EU
2
Broadcasting system
1) PAL/SECAM BG
2) PAL/SECAM DK
3) PAL I / II
4) SECAM L/L’
5) DVB T 
6) DVB C
7) DVB T2
8) DVB S2
Programme Coverage (EU)
Digital TV
- PD31B/C are not support SECAM L/L`
- Only PD31B support DVB-T2
- Only PD31C support DVB-S2
Analogue TV
VHF: E2 to E12, UHF: E21 to E69,
CATV: S1 to S20, HYPER: S21 to S47
1) PAL/SECAM BG
2) PAL/SECAM DK
3) PAL I
4) NTSC M
5) DVB T 
Programme Coverage (NON-EU)
Digital TV
VHF 04 to 13, UHF 27 to 69
Analogue TV
VHF/UHF 1 to 78, CATV 01 to 71
3
Receiving system
Analog : Upper Heterodyne
Digital : COFDM
4
Scart Jack (1EA)
PAL, SECAM
EU ONLY
5
Component Input (1EA)
Y/Cb/Cr, Y/ Pb/Pr
6
RGB Input (1EA)
RGB-PC
Commercial  Model  ONLY
7
RS232C (1EA)
SVC
Commercial  Model ONLY
8
AV (2EA)
CVBS ( Hybrid :1)
EU model have 1 AV ( Hybrid)
9
HDMI Input (2 or 3EA)
HDMI-PC
HDMI-DTV
HDMI/PC 1,  HDMI2
10
Audio Input (1EA)
DVI Audio, Component
L/R Input
11
SPDIF Out (1 EA)
SPDIF Out
12
USB (1EA)
for SVC, S/W Download, DivX
13
LAN
only DVB-T2 (UK, Irend) Model
14
PCMCI (1EA)
DVB-T/C Decryption Interface, CI+
EU ONLY
5. Model General Specification
- 6 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to PD31A chassis applied PDP TV all 
models manufactured in TV factory.
2. Designation
(1)  The  adjustment  is  according  to  the  order  which  is 
designated and which must be followed, according to the 
plan which can be changed only on agreeing.
(2) Power adjustment : Free Voltage.
(3) Magnetic Field Condition: Nil.
(4) Input signal Unit: Product Specification Standard.
(5) Reserve after operation: Above 5 Minutes (Heat Run)
 Temperature : at 25 °C ± 5 °C
 Relative humidity : 65 % ± 10 %
 Input voltage : 220V, 60Hz
(6)  Adjustment  equipments  :  Color  Analyzer  (CA-210  or 
CA-110),  DDC Adjustment  Jig  equipment,  SVC  remote 
controller.
(7)  The receiver must be operated for about 5 minutes prior to 
the adjustment when module is in the circumstance of over 
15
-  In case of keeping module is in the circumstance of 0°C, it 
should  be  placed  in  the  circumstance  of  above  15°C  for  2 
hours.
-  In  case  of  keeping  module  is  in  the  circumstance  of  below 
-20°C,  it  should  be  placed  in  the  circumstance  of  above 
15°C for 3 hours.
■  After RGB Full White in HEAT-RUN Mode, the receiver must 
be operated prior to the adjustment.
■ 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 ( WHITE ) of HEAT RUN MODE uses to 
check panel. 
● 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.
(8) Push The “IN STOP KEY” – For memory initialization.
3. Main PCB check process
* APC - After Manual-Insult, executing APC
Boot file Download 
(1)  Execute  ISP  program  “Mstar  ISP  Utility”  and  then  click 
“Config” tab.
(2)  Set as below, and then click “Auto Detect” and check “OK” 
message
    If “Error” is displayed, Check connection between computer, 
jig, and set.
(3)  Click “Read” tab, and then load download file (XXXX.bin) 
by clicking “Read”
(4)  Click “Connect” tab.  If “Can’t ” is displayed, Check 
connection between computer, jig, and set.
(5) Click “Auto” tab and set as below. 
(6) Click "Run".
(7) After downloading, check "OK" message. 
Case1 : Software version up
1)  After downloading S/W by USB , Multi-vision set will reboot 
automatically
2) Push “In-stop” key
3) Push “Power on” key
4) Function inspection
5) After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1)  When TV set is entering on the assembly line, Push “In-
stop” ke y at first.
2) Push “Power on” key for turning it on.
->  If you push “Power on” key, TV set will recover channel 
information by itself.
3) After function inspection, Push “In-stop” key.
- 7 -
*
 USB DOWNLOAD(*.epk file download)
(1)  Put the USB Stick to the USB socket 
(2)  Automatically detecting update file in USB Stick
-  If your downloaded program version in USB Stick is Low, 
it didn’t work.
-   But  your  downloaded  version  is  High,  USB  data  is 
automatically detecting
(3)  Show the message “Copying files from memory”
(4)  Updating is staring.
(5)  Updating  Completed,  The  Multi-vision  will  restart 
automatically.
(6)  If  your  Multi-vision  is  turned  on,  check  your  updated 
version  and  Tool  option.  (explain  the  Tool  option,  next 
stage)
* After downloading, have to adjust TOOL OPTION again.
1) Push "IN-START" key in service remote controller.
2) Select "Tool Option 1" and Push “OK” button.
3)  Punch  in  the  number.  (Each  of  models  has  their 
number.)
4) Completed selecting Tool option.
3.1. ADC Process
3.1.1. ADC
■ Enter Service Mode by pushing “ADJ” key,
Calibration”
 
* Caution :  Using  ‘power  on’  button  of  the Adjustment  R/C  , 
power on Multi-vision.
* ADC Calibration Protocol (RS232)
 - Adjust Sequence
▪aa 00 00  [Enter Adjust Mode]
▪xb 00 40  [Component1 Input (480i)]
▪ad 00 10  [Adjust 480i Comp1]
▪aa 00 90  End Adjust mode
* Required equipment : Adjustment R/C. 
3.2. Function Check
3.2.1. Check display and sound 
■ Check Input and Signal items. (cf. work instructions) 
1) TV
2)AV (SCART/ CVBS)
3) COMPONENT (480i)
4) HDMI
5) PC Audio In 
  *  Display and Sound check is executed 
    by Remote controller.
* Caution :  Not to push the INSTOP KEY after completion if 
the function inspection.
50PN450B-Z*
HD/FHD
HD
Tool option 1
36864
Tool option 2
21800
Tool option 3
3313
Tool option 4
51398
Tool option 5
10
NO
Enter  
Adjust MODE
ADC adjust
Item
Adjust ‘Mode In’
ADC Adjust
CMD 1
A
A
CMD 2
A
D
Data 0
0
1
0
0
When transfer the  
‘Mode In’,
Carry the command.
Automatically adjustment
(The use of a internal 
pattern)
- 8 -
4. Total Assembly line process
4.1. POWER PCB Assy voltage adjustment
          (Vs voltage adjustment)
4.1.1.Test equipment : D.M.M 1EA
4.1.2. Condition for adjustment
- No signal with the snow noise in RF mode
4.1.3. Connection Diagram for Measuring 
         : refer to fig.7
4.1.4. Adjustment method
 
4.1.4.1 Vs adjustment
(1)  Connect + terminal of D. M..M. to Vs TP, connect -terminal 
to GND.
(2)  After turning VR901, voltage of D.M.M adjustment as same 
as Vs voltage which on label of panel right/top  ( deviation 
; ±0.5V)
4.1.4.2 Va adjustment
(1)  Connect + terminal of D. M..M. to Va TP, connect -terminal 
to GND.
(2)  After turning VR502, voltage of D.M.M adjustment as same 
as Va voltage which on label of panel right/top  ( deviation 
; ±0.5V)
4.2. Adjustment Preparation
● Required Equipment
-  Remote controller for adjustment 
-  Color Analyzer ( CS-1000, CA-100,100+,CA-210 or same 
product : CH 11 (PDP) 
*  Please adjust CA-210, CA-100+ by CS-1000 before measur-
ing
-  Auto W/B adjustment instrument(only for Auto adjust-
ment)
-  9 Pin D-Sub Jack(RS232C) is connected to the AUTO 
W/B EQUIPMENT.
Before Adjust of White Balance, Please press 
POWER ONLY key
- Adjust Process will start by execute RS232C Command.
● Color temperature standards according to CSM and Module 
●  CS-1000/CA-100+/CA-210(CH 10) White balance adjust-
ment coordinates and color temperature.
*  Connecting picture of the measuring instrument (On Auto-
matic control)
-  Inside PATTERN is used when W/B is controlled. Con-
nect to auto controller or push Adjustment R/C POWER-
ON  ->  Enter the mode of White-Balance, the pattern will 
come out.
CSM
PLASMA
Cool
11000K
Medium
9300K
Warm
6500K
CSM
Color Coordination
Temp
± Color
Coordination
x
y
COOL
0.276 
0.283 
11000K
0.002
MEDIUM
0.285
0.293 
9300K
0.002
WARM
0.313 
0.329 
6500K
0.002
- 9 -
* Auto-control interface and directions
1)  Adjust in the place where the influx of light like floodlight 
around is blocked. (Illumination is less than 100Lux).
2)  Adhere closely  the Color Analyzer ( CA210 ) to the 
module less than 10cm distance, keep it with the surface 
of the Module and Color Analyzer’s Prove vertically.
(80~100°).
3) Aging time  
-  After aging start, keep the power on (no suspension of 
power supply) and heat-run over 5 minutes.
-  Using ‘no signal’ or ‘full white pattern’ or the others, 
check the back light on.   
■  Auto adjustment Map(RS-232C)
RS-232C COMMAND
[ CMD    ID    DATA ]    
   Wb     00       00       White Balance Start
   Wb     00       ff         White Balance End
* Caution 
- Color Temperature : COOL, Medium, Warm.
-  One of R Gain/G Gain/ B Gain should be kept on 0xC0, 
and adjust other two lower than C0. (when R/G/B Gain 
are all C0, it is the FULL Dynamic Range of  Module)
* Manual W/B process using adjusts Remote control.
■ After enter Service Mode by pushing “ADJ” key,
■  Enter White Balance by pushing “►” key at “6. White 
Balance”.
■  Stick the sensor to the center of the screen and select 
each items(Red/Green/Blue Gain) using ▲/▼(CH +/-) 
key on R/C.
■ Adjust R/G/B Gain using◄/►(VOL +/-) key on R/C.
■  Adjust three modes all(Cool/Medium/Warm) : Fix the one 
of R/G/B Gain and Change the others.
■ When the adjustment is completed, Enter “COPY ALL”.
■ Exit adjustment mode using EXIT key on R/C.
*  After You finish all adjustments, Press “In-start” button and 
compare Tool option and Area option value with its BOM, if it 
is correctly same then unplug the AC cable.
   If it is not same, then correct it same with BOM and unplug 
AC cable.
  For correct it to the model’s module from factory JIG model.
*  Push The “IN STOP KEY” after completing the function 
inspection. And Mechanical Power Switch must be set “ON”
*  To check the coordinates of White Balance, you have to 
measure at the below conditions.
-  Picture mode : Vivid, Energy Saving : Off, Below the Ad-
vanced control, Dynamic Contrast : Off, Dynamic Colour : Off 
  Colour Temp. 
-> Picture Mode change : Vivid -> Vivid(User)
4.3. DDC EDID Write (HDMI 256Byte) 
      -> Not used any more, Use Auto D/L
■ Connect HDMI Signal Cable to HDMI Jack.
■  Write EDID DATA to EEPROM(24C02) by using DDC2B 
protocol.
■ Check whether written EDID data is correct or not.
*  For SVC main Ass’y, EDID have to be downloaded to Insert 
Process in advance.
4.4. EDID DATA
(1) All Data : HEXA Value
(2) Changeable Data :
     * : Serial No : Controlled / Data:01
     ** : Month : Controlled / Data:00
     *** : Year : Controlled
     **** : Check sum
4.5. EDID DATA Auto Download
(1) Press Adj. key on the Adj. R/C,
(2) Select EDID D/L menu.
(3) By pressing Enter key, EDID download will begin
(4)  If Download is successful, OK is display, but If Download is 
failure, NG is displayed.
(5) If Download is failure, Re-try downloads.
  
RS-232C 
COMMAND
[CMD ID DATA]
M
I
N
CENTER
(DEFAULT)
M
A
X
Cool Mid Warm
Cool Mid Warm
R Gain
jg
Ja
jd
00
172 192
192
192
G Gain
jh
Jb
je
00
172 192
192
192
B Gain
ji
Jc
jf
00
192 192
172
192
R Cut
64
64
64
128
G Cut
64
64
64
128
B Cut
64
64
64
128
Cool
30
Medium
0
Warm
30
- 10 -
4.6 LNB voltage and 22KHz tone check
 
(1) Test method
1)  Press "Power on" button of a service R/C.(Baud rate : 
115200 bps)
2) Connect cable between satellite ANT and test JIG.
3) Connect RS232-C Signal Cable.
4) Write LNB ON control command through RS-232-C.
5) check LED light ‘ON’ at 18V menu.
6) check LED light ‘ON’ at 22KHz tone menu.
7) Write LNB OFF control command through RS-232-C.
8) check LED light ‘OFF’ at 18V menu.
9) check LED light ‘OFF’ at 22KHz tone menu.
(2) RS-232 command for test LNB
(3) Test result
-  After send LNB On command, ‘18V LED’ and ‘22KHz 
tone LED’ should be ON. 
-  After send LNB Off command, ‘18V LED’ and ‘22KHz tone 
LED’ should be OFF. 
<Remark> 
After the measurement conditions witnessed in the last state.
* Caution :  Never connect HDMI & D-sub Cable when EDID 
downloaded.
■ Edid data and Model option download (RS232 Zender)
- Manual Download
* Caution
● Use the proper signal cable for EDID Download
   - Digital EDID : Pin3 exists
* Caution
- Never connect HDMI & D-sub Cable at the same time.
- Use the proper cables below for EDID Writing.
-  Download HDMI1, HDMI2 separately because HDMI1 is dif-
ferent from HDMI2.
NO
Enter  
download MODE
EDID data and
Model option download
Item
download ‘Mode In’
download
CMD 1
A
A
CMD 2
A
E
Data 0
0
00
0
10
When transfer the  
‘Mode In’,
Carry the command.
Automatically download
(The use of a internal 
Data)
No.
Item
Condition
Hex Data
1
Manufacturer ID
GSM
1E6D
2
Version
Digital : 1
01
3
Revision
Digital : 3
03
For HDMI EDID
DVI-D to HDMI or HDMI to HDMI
Command
Set ACK
LNB On
[A][I][ ][Set ID][ ][30][Cr]
[O][K][x] or NG : [N][G][x]
LNB Off
[A][I][ ][Set ID][ ][40][Cr]
[O][K][x] or NG : [N][G][x]
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Download LG 50PN4503-ZA / 50PN450B-ZA (CHASSIS:PD31A) Service Manual (Repair Manual)

Here you can view online and download LG 50PN4503-ZA / 50PN450B-ZA (CHASSIS:PD31A) Service Manual in PDF. 50PN4503-ZA / 50PN450B-ZA (CHASSIS:PD31A) service manual will guide through the process and help you recover, restore, fix, disassemble and repair LG 50PN4503-ZA / 50PN450B-ZA (CHASSIS:PD31A) Plasma. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.