LG 50PJ350 User manual

PLASMA TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : PB02A
MODEL : 50PJ350 50PJ350-SA
North/Latin A erica http://aic.lgservice.co
Europe/Africa http://eic.lgservice.co
Asia/Oceania http://biz.lgservice.co
Internal Use Only
Printed in Korea
P/NO : MFL63140202(1004-REV00)

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Only or training and service purposes
CONTENTS
CONTENTS ............................................................................................................................... 2
SAFETY PRECAUTIONS ...........................................................................................................3
SPECIFICATION.........................................................................................................................4
ADJUSTMENT INSTRUCTION ..................................................................................................8
BLOCK DIAGRAM ...................................................................................................................15
EXPLODED VIEW ...................................................................................................................1
SVC. SHEET ................................................................................................................................

- 3 - LGE Internal Use OnlyCopyright ©2010 LG Electronics Inc. All rights reserved.
Only or training and service purposes
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special sa ety-related characteristics. These parts are identi ied by in
the Schematic Diagram and Exploded View.
It is essential that these special sa ety parts should be replaced with the same components as recommended in this manual to
prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modi y the original design without permission o manu acturer.
General Guidance
An isolation Transformer should always be used during the
servicing o a receiver whose chassis is not isolated rom the AC
power line. Use a trans ormer o adequate power rating as this
protects the technician rom accidents resulting in personal injury
rom electrical shocks.
It will also protect the receiver and it's components rom being
damaged by accidental shorts o the circuitry that may be
inadvertently introduced during the service operation.
I any use (or Fusible Resistor) in this monitor is blown, replace it
with the speci ied.
When replacing a high wattage resistor (Oxide Metal Film
Resistor, over 1W), keep the resistor 10mm away rom PCB.
Keep wires away rom high voltage or high temperature parts.
Due to high vacuum and large sur ace area o picture tube,
extreme care should be used in handling the Picture Tube.
Do not li t the Picture tube by it's Neck.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed rom AC source, connect
an electrical jumper across the two AC plug prongs. Place the
AC switch in the on position, connect one lead o 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.
I 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 in inite.
An other abnormality exists that must be corrected be ore 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 or 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 o the limits speci ied, there is
possibility o shock hazard and the set must be checked and
repaired be ore 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

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Only for training an service purposes
SPECIFICATIONS
NOTE : Specifications an others are subject to change without notice for improvement .
1. Application Range
(1) This spec sheet is applie all of PDP TV with PB02A chassis.
2. Specification
Each part is teste as below without special appointment.
(1) Temperature : 25 °C ± 5 °C (77 °F ± 9 °F), CST : 40 °C ± 5 °C
(2) Relative Humi ity : 65 % ± 10 %
(3) Power Voltage : Stan ar input voltage (100 V - 240 V ~ 50 / 60 Hz)
* Stan ar Voltage of each pro uct is marke by mo els
(4) Specification an performance of each parts are followe each rawing an specification by part number in accor ance with
BOM.
(5) The receiver must be operate for about 5 minutes prior to the a justment.
3. Test Method
(1) Performance : LGE TV test metho followe .
(2) Deman e other specification
Safety : UL, CSA, IEC specification, CE
EMC : FCC, ICES, IEC specification, CE
Mo el Name Market Bran
50PJ350-SA Brazil LG
Mo el Name Market Appliance
50PJ350-SA Brazil Safety : IEC/EN60065

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Only for training an service purposes
. General Specification
No Item Specification Remark
1. Receiving System 1) SBTVD / NTSC / PAL-M / PAL-N
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 07-69 (VHF high/UHF)
4) CATV : 02~135
3. Input Voltage 1)AC 100 ~ 240V 50/60Hz
4. Market BRAZIL
5. Screen Size 127 cm (50 inch) Wi e(1365 X 768) 50PJ350-SA, 50PJ250-SA
106 cm (42 inch) Wi e(1024 X 768) 42PJ350-SA, 42PJ250-SA
42PJ230-SB
6. Aspect Ratio 16:9
7. Tuning System FS
8. Mo ule PDP50T1#### (1365 X 768) 50PJ350-SA, 50PJ250-SA
PDP42T1#### (1024 X 768) 42PJ350-SA, 42PJ250-SA
42PJ230-SB
9. Operating Environment 1) Temp : 0 eg ~ 40 eg
2) Humi ity : ~ 80 %
10. Storage Environment 1)Temp : -20 eg ~ 60 eg
2) Humi ity : 0 ~ 90 %

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Only for training an service purposes
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Propose
PC DDC
1. 640*350 31.468 70.09 25.17 EGA X
2. 720*400 31.469 70.08 28.32 DOS 0
3. 640*480 31.469 59.94 25.17 VESA(VGA) 0
4. 800*600 37.879 60.31 40.00 VESA(SVGA) 0
5. 1024*768 48.363 60.00 65.00 VESA(XGA) 0
6. 1280*768 47.776 59.870 79.5 CVT(WXGA) 0
7. 1360*768 47.712 60.015 85.50 VESA (WXGA) 0
8. 1280*1024 63.981 60.020 108.00 VESA (SXGA) 0
9. 1600*1200 75.00 60.00 162 VESA (UXGA) 0
10 1920*1080 67.5 60 148.5 HDTV 1080P 0
6. RGB Input (PC)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Propose
1. 720*480 15.73 60 13.5135 SDTV ,DVD 480I
2. 720*480 15.73 59.94 13.5 SDTV ,DVD 480I
3. 720*480 31.50 60 27.027 SDTV 480P
4. 720*480 31.47 59.94 27.0 SDTV 480P
5. 1280*720 45.00 60.00 74.25 HDTV 720P
6. 1280*720 44.96 59.94 74.176 HDTV 720P
7. 1920*1080 33.75 60.00 74.25 HDTV 1080I
8. 1920*1080 33.72 59.94 74.176 HDTV 1080I
9. 1920*1080 67.50 60 148.50 HDTV 1080P
10. 1920*1080 67.432 59.94 148.352 HDTV 1080P
11. 1920*1080 27.00 24.00 74.25 HDTV 1080P
12. 1920*1080 26.97 23.976 74.176 HDTV 1080P
13. 1920*1080 33.75 30.00 74.25 HDTV 1080P
14. 1920*1080 33.71 29.97 74.176 HDTV 1080P
5. Component Input (Y, CB/PB, CR/PR)

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Only for training an service purposes
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Propose
PC DDC
1 640*350 31.468 70.09 25.17 EGA X
2 720*400 31.469 70.08 28.32 DOS 0
3 640*480 31.469 59.94 25.17 VESA(VGA) 0
4 800*600 37.879 60.31 40.00 VESA(SVGA) 0
5 1024*768 48.363 60.00 65.00 VESA(XGA) 0
6 1280*768 47.776 59.870 79.5 CVT(WXGA) 0
7 1360*768 47.712 60.015 85.50 VESA (WXGA) 0
8 1280*1024 63.981 60.020 108.00 VESA (SXGA) 0
9 1600*1200 75.00 60.00 162 VESA (UXGA) 0
10 1920*1080 67.5 60 148.5 HDTV 1080P 0
DTV
1 720*480 31.50 60 27.027 SDTV 480P
2 720*480 31.47 59.94 27.00 SDTV 480P
3 1280*720 45.00 60.00 74.25 HDTV 720P
4 1280*720 44.96 59.94 74.176 HDTV 720P
5 1920*1080 33.75 60.00 74.25 HDTV 1080I
6 1920*1080 33.72 59.94 74.176 HDTV 1080I
7 1920*1080 67.50 60 148.50 HDTV 1080P
8 1920*1080 67.432 59.94 148.352 HDTV 1080P
9 1920*1080 27.00 24.00 74.25 HDTV 1080P
10 1920*1080 26.97 23.976 74.176 HDTV 1080P
11 1920*1080 33.75 30.00 74.25 HDTV 1080P
12 1920*1080 33.71 29.97 74.176 HDTV 1080P
7. HDMI Input(PC/DTV)

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to PB02A Chassis applied PDP TV
all models manu actured in TV actory.
2. Specification
(1) Because this is not a hot chassis, it is not necessary to use
an isolation trans ormer. However, the use o isolation
trans ormer will help protect test instrument.
(2) Adjustment must be done in the correct order. But it is
lexible when its actory local problem occurs.
(3) The adjustment must be per ormed in the circumstance o
25 cC ± 5 cC o temperature and 65 % ± 10 % o relative
humidity i there is no speci ic designation.
(4) The input voltage o the receiver must keep 100 V - 240 V,
50 / 60 Hz.
(5) Be ore adjustment, execute Heat-Run or 5 minutes.
VA ter Receive 100% Full white pattern (06CH) then
process Heat-run
(or “8. Test pattern” condition o Ez-Adjust status)
VHow to make set white pattern
1) Press Power ON button o Service Remocon
2) Press ADJ button o Service remocon. Select “10.
Test pattern” and, a ter select “White” using
navigation button, and then you can see 100% Full
White pattern.
* In this status you can maintain Heat-Run useless any
pattern generator
* Notice: i you maintain one picture over 20 minutes
(Especially sharp distinction black with white pattern –
13Ch, or Cross hatch pattern – 09Ch) then it can
appear image stick near black level.
3. Adjustment items
3-1. PCB Assembly adjustment
(1) Adjust 480i Comp1
(2) Adjust 1080p Comp1/RGB
- I it is necessary, it can adjustment at Manu acture Line
- You can see set adjustment status at “9. ADJUST
CHECK” o the “In-start menu”
3-2. Set Assembly Adjustment
(1) EDID (The Extended Display Identi ication Data )
(2) Color Temperature (White Balance) Adjustment
(3) Make sure RS-232C control
(4) Selection Factory output option
4. PCB Assembly Adjustment
4-1. Using RS-232C
- Adjust 3 items at 3-1 PCB assembly adjustments
“ (3) Adjustment sequence” one a ter the order.
(1) Adjustment protocol
(2) Necessary items be ore Adjustment items
OPattern Generator : (MSPG-925FA)
OAdjust 480i Comp1
(MSPG-925FA:model :209, pattern :65) – Comp1 Mode
OAdjust 1080p Comp1
(MSPG-925FA:model :225 , pattern :65) – Comp1 Mode
OAddjust RGB (MSPG-925FA:model :225 , pattern :65)
– RGB-PC Mode
* I you want more in ormation then see the below Adjustment
method (Factory Adjustment)
(3) Adjustment sequence
Oaa 00 00: Enter the ADC Adjustment mode.
Oxb 00 40: Change the mode to Component1 (No actions)
Oad 00 10: Adjust 480i Comp
Oad 00 10: Adjust 1080p comp
Oxb 00 60: Change to RGB-PC mode(No action)
Oad 00 10: Adjust 1080p RGB
Oxb 00 90: Endo o Adjustmennt
< See ADC Adjustment RS232C Protocol_Ver1.0 >

5. Factory Adjustment
-> PB02A : USE INTERNAL ADC(S7) : using internal pattern.
5-1. Auto Adjust Component
480i/1080p RGB 1080p
(1) Summary : Adjustment component 480i/1080i and RGB
1080p is Gain and Black level setting at Analog
to Digital converter, and compensate the RGB
deviation
(2) Using instrument
1) Adjustment remocon, 801GF(802B, 802F, 802R) or
MSPG925FA pattern generator
(It can output 480i/1080i horizontal 100 % color bar
pattern signal, and its output level must setting
0.7 V ± 0.1 V p-p correctly)
* You must make it sure its resolution and pattern cause every
instrument can have di erent setting
2) Adjustment method 480i Comp1, Adjust 1080p
Comp1/RGB (Factory adjustment)
O ADC 480i Component1 adjustment -
- Check connection o Component1
- MSPG-925FA Ë Model: 209, Pattern 65
OSet Component 480i mode and 100% Horizontal
Color Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
OADC 1080p Component1 / RGB adjustment
- Check connection both o Component1 and RGB
- MSPG-925FA Ë Model: 225, Pattern 65
OSet Component 1080p mode and 100% Horizontal
Color Bar Pattern(HozTV31Bar), then set TV set to
Component1 mode and its screen to “NORMAL”
OA ter get each the signal, wait more a second and
enter the “IN-START” with press IN-START key o
Service remocon. A ter then select “7. External ADC”
with navigator button and press “Enter”.
OA ter Then Press key o Service remocon “Right
Arrow(VOL+)”
OYou can see “ADC Component1 Success”
OComponent1 1080p, RGB 1080p Adjust is same
method.
OComponent 1080p Adjustment in Component1 input
mode
ORGB 1080p adjustment in RGB input mode
OI you success RGB 1080p Adjust. You can see “ADC
RGB-DTV Success”
Caution : Set Volume 0 a ter adjustment
5-2. Use Internal ADC(S7)
- ADJ(EZ ADJUST) -> 6.ADC Calibration -> ADC
Calibration(START)
5-3. EDID(The Extended Display
Identification Data) / DDC(Display Data
Channel) download
(1) Summary
1) It is established in VESA, or communication between
PC and Monitor without order rom user or building user
condition. It helps to make easily use realize “Plug and
Play” unction.
2) For EDID data write, we use DDC2B protocol.
5-4. Auto Download
(1) A ter enter Service Mode by pushing “ADJ” key,
(2) Enter EDID D/L mode.
(3) Enter “START” by pushing “OK” key.
Caution
- Never connect HDMI & D-sub Cable when the user
downloading .
- Use the proper cables below or EDID Writing.
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Only or training and service purposes
< Adjustment pattern : 480i / 1080p 60Hz Pattern >

* Edid data and Model option download(RS232)
5-5. Manual Download
(1) Write HDMI EDID data
1) Using instruments
- Jig. (PC Serial to D-Sub connection) or PC, DDC
adjustment.
- S/W or DDC recording (EDID data write and read)
- D-sub jack
- Additional HDMI cable connection Jig.
2) Preparing and setting.
- Set instruments and Jig. Like pic.5), then turn on PC
and Jig.
- Operate DDC write S/W (EDID write & read)
- It will operate in the DOS mode.
- EDID data (Model name = LG TV)
- 2010 EDID DATA CHECK SUM.
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BLOCK(0) BLOCK(1)
HD HDMI1 3B 2C
HDMI2 3B 1C
HDMI3 3B 0C
RGB A3 25
FHD HDMI1 3B 2C
HDMI2 3B 1C
HDMI3 3B 0C
HDMI4 3B FC
RGB A3 25
< For write EDID data, setting Jig and another instruments >