LG INFINIA 50PK950 Installation guide

Published October 13
th
, 2010
Advanced Single Scan Troubleshooting
50" Class Full HD 1080p Plasma TV
(50" diagonally)
Wireless Ready
Training Manual
50PK950 Plasma Display
50PK950 Plasma Display

2October 2010 50PK950 Plasma
Overview of Topics to be Discussed
• Y-SUS Board
• Z-SUS Board Uses a Z-SUB Board for panel drive connection.
• Y-Drive Boards (1 Upper and 1 Lower).
• Control Board
• X Drive Boards (3)
Troubleshooting:
Circuit Board Operation, Troubleshooting and Alignment of :
• Switch Mode Power Supply No “VS On” command input to SMPS from the Main Board.
• Main Board: Wireless capabilities, Internet via LAN or Wireless using Dongle through USB.
Preliminary:
Contact Information, Preliminary Matters, Specifications,
Plasma Overview, General Troubleshooting Steps,
Disassembly Instructions, Voltage and Signal Distribution
OUTLINE
OUTLINE
Interconnect Diagram: 11X17 Foldout Section used as a quick reference sheet.
Either can run separately, but you must remove the other completely.
• Front IR/Intelligent Sensor, Center LOGO and Motion Remote Boards

3October 2010 50PK950 Plasma
50PK950 Plasma Display
Section 1
This Section will cover Contact Information and remind the Technician of Important
Safety Precautions for the Customer’s Safety as well as the Technician’s and the
Equipment.
Basic Troubleshooting Techniques which can save time and money sometimes can
be overlooked. These techniques will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and
Layout of the Plasma Display Panel.
At the end of this Section the Technician should be able to Identify the Circuit
Boards and have the ability and knowledge necessary to safely remove and
replace any Circuit Board or Assembly.
Overview of Topics to be Discussed
Overview of Topics to be Discussed

4October 2010 50PK950 Plasma
Customer Service (and Part Sales) [phone]
Technical Support (and Part Sales) [phone]
USA Website (GSFS) http://gsfs-america.lge.com
Customer Service Website us.lgservice.com
Knowledgebase Website lgtechassist.com
LG Web Training lge.webex.com
LG CS Academy lgcsacademy.com
Published October 2010 by LG Technical Support and Training
LG Electronics Alabama, Inc.
201 James Record Road, Huntsville, AL, 35813.
32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80,
47LG90, 47LH85, 47LE8500
42PG20, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK950, 50PK950, 50PS80, 50PS60,
60PK750, 60PS11, 60PS60, 60PS80
LCD-DV:
PLASMA:
Also available on the Plasma Page:
PDP Panel Alignment Handbook, Schematics with Bookmarks
Plasma Control Board ROM Update (Jig required)
Presentations with Audio/Video
and Screen Marks
New Training Materials on
New Training Materials on
the Learning Academy site
the Learning Academy site
http://136.166.4.200
New: Software Downloads
Technical Assistance
LG Contact Information
LG Contact Information

5October 2010 50PK950 Plasma
IMPORTANT SAFETY NOTICE
IMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate
background in electrical equipment, electronic devices, and mechanical systems. In any attempt
to repair a major Product, personal injury and property damage can result. The manufacturer or
seller maintains no liability for the interpretation of this information, nor can it assume any
liability in conjunction with its use. When servicing this product, under no circumstances should
the original design be modified or altered without permission from LG Electronics. Unauthorized
modifications will not only void the warranty, but may lead to property damage or user injury.
If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for
service, they must be returned to their original positions and properly fastened.
CAUTION
CAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power
is required for diagnosis or test purposes, disconnect the power immediately after performing
the necessary checks. Also be aware that many household products present a weight hazard.
At least two people should be involved in the installation or servicing of such devices.
Failure to consider the weight of an product could result in physical injury.
Preliminary Matters (The Fine Print)
Preliminary Matters (The Fine Print)

6October 2010 50PK950 Plasma
Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage
the electronics in a manner that renders them inoperative or reduces the time until their next failure.
Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively,
you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before
removing a replacement part from its package, touch the anti-static bag to a ground connection point or
unpainted metal in the product. Handle the electronic control assembly by its edges only. When
repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.
Regulatory Information
Regulatory Information
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate
the receiving antenna; Increase the separation between the equipment and the receiver; Connect the
equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the
dealer or an experienced radio/TV technician for help.
ESD Notice
ESD Notice (Electrostatic Static Discharge)
(Electrostatic Static Discharge)

7October 2010 50PK950 Plasma
Safety & Handling Regulations
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.
3. Check details of defective condition and history. Example: Y-SUS or Y-Drive Board Failure, Mal-discharge on screen, etc.
1. Approximately 10 minute pre-run time is required before any adjustments are performed.
2. Refer to the Voltage Sticker on the Panel when making adjustments on the Power Supply, Y-SUS and Z-SUS Boards.
3. Always adjust to the specified voltage level (+/- ½ volt) unless otherwise specified.
4. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, check that the Power Supply
and Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.
5. C-MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity.
6. The PDP Module must be carried by two people. Always carry vertical NOT horizontal.
7. The Plasma television should be transported vertically NOT horizontally.
8. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.
9. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.
10. New Plasma Models have thinner Display Panels and Frames than previous models. Be careful when lifting
Plasma Display’s because flexing the panel may damage the frame mounts or panel.
Checking Points to be Considered
Safety and Handling, Checking Points
Safety and Handling, Checking Points

8October 2010 50PK950 Plasma
Basic Troubleshooting Steps
Basic Troubleshooting Steps
Define, Localize, Isolate and Correct
•Define Look at the symptom carefully and determine what circuits could be causing the
failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check
for possible overheated components. Capacitors will sometimes leak dielectric material and
give off a distinct odor. Frequency of power supplies will change with the load, or listen for
relay closing etc. Observation of the front Power LEDs may give some clues.
•Localize After carefully checking the symptom and determining the circuits to be checked
and after giving a thorough examination using your senses the first check should always be
the DC Supply Voltages to those circuits under test. Always confirm the supplies are not
only the proper level but be sure they are noise free. If the supplies are missing check the
resistance for possible short circuits.
•Isolate To further isolate the failure, check for the proper waveforms with the
Oscilloscope to make a final determination of the failure. Look for correct Amplitude
Phasing and Timing of the signals also check for the proper Duty Cycle of the signals.
Sometimes “glitches” or “road bumps” will be an indication of an imminent failure.
•Correct The final step is to correct the problem. Be careful of ESD and make sure to
check the DC Supplies for proper levels. Make all necessary adjustments and lastly always
perform a Safety AC Leakage Test before returning the product back to the Customer.

9October 2010 50PK950 Plasma
This section of the manual will discuss the specifications of the
50PK950 Advanced Single Scan Plasma Display Television.
50PK950 PRODUCT INFORMATION SECTION
50PK950 PRODUCT INFORMATION SECTION

10 October 2010 50PK950 Plasma
Wireless Media Box (Sold Separately)
The Wireless Media box communicates to the television via a wireless receiver
called a “Dongle”. The Dongle attaches to the Television via two connections:
1. HDMI Cable from the Dongle to the TV to transfer Audio and Video Signals.
2. Wired Remote cable between the TV and Dongle for Control Functions.
WIRELESS SECTION (Wireless Media Box)
WIRELESS SECTION (Wireless Media Box)
Media Box
Wireless Receiver/Transmitter
“Dongle”
Attaches via Velcro to
the back of the set
Wired Remote to control the Media Box
HDMI
TV A/V Inputs

11 October 2010 50PK950 Plasma
Wireless LAN (Sold Separately)
Using the LG Wireless LAN for Broadband/DLNA Adaptor, (DLNA: Digital Living
Network Alliance) which is sold separately, allows the TV to connect to a wireless
LAN network. The DLNA adaptor attaches to the Television via either of the two USB
connections:
Wireless LAN (DLNA Adaptor)
Wireless LAN (DLNA Adaptor)
Wireless Router
DLNA Adaptor
“Dongle”
Side A/V Inputs

12 October 2010 50PK950 Plasma
50PK950 Specifications
50PK950 Specifications
1080P PLASMA HDTV
50" Class (50" diagonal)
•INFINIA Series
•Tru-Black Filter
•THX Certified
•1080P Full HD Resolution
•600 Hz sub field driving
•1,500 cd/m2 Brightness
•Dual XD Engine™
•3,000,000:1 Dynamic Contrast Ratio
•Smart Energy Saving
•4x HDMI™ V.1.3 with Deep Color (3 Rear, 1 side).
•AV Mode II (Cinema, Sports, Game)
•Clear Voice II
•LG SimpLink™ Connectivity
•Invisible Speaker System
•100,000 Hours to Half Brightness (Typical)
•PC Input
•USB 2.0 (JPEG, MP3, MP4, Divx)
•NetCast™ Entertainment Access
•Yahoo!® TV Widgets Netflix® Instant Streaming Ready
•Vudu™ (Streaming) YouTube™
•Picasa™ Web Albums AccuWeather®
For Full Specifications
See the Specification Sheet
•Wi-Fi Certified TM
(Adaptor Included)
•Wireless 1080p Ready
•Full 1080p Resolution
•5M:1 Contrast Ration
•Seamless Design
•Magic Motion Remote
•Picture Wizard II
(Easy Picture Calibration)
•Intelligent Sensor
•Dual XD Engine
•ISFccc®Ready
•24P Real Cinema
•DivX®HD
•DNLA Certified®(JPEG Only)
•SIMPLINK TM Connectivity
•Dolby®Digital 5.1 Decoder
•Infinite Sound

13 October 2010 50PK950 Plasma
50PK950 Logo Familiarization Page 1 of 3
50PK950 Logo Familiarization Page 1 of 3
New definition television. LG’s INFINIA TVs are redefining home
entertainment. Even beyond their jaw-dropping design, they offer
access to virtually unlimited entertainment through broadband
connectivity and freedom with wireless HD capability.
You don’t have to take our word for it that this is an amazing TV.
To earn THX certification, our TV’s passed more than 30
rigorous tests, ensuring you’re bringing an uncompromised HD
experience home - as the director wanted it.
Entertainment on tap. NetCast Entertainment Access brings the
best Internet services direct to your TV—no computer required.
Instantly access movies and TV shows, news and weather and
the world’s largest library of HD movies in 1080p.
The new black. Don’t let the lamp in the corner keep you from
seeing what’s going on in the movie. LG’s TruBlack Filter helps
block glare while boosting images on the screen to improve
picture quality and contrast ratio.

14 October 2010 50PK950 Plasma
50PK950 Logo Familiarization Page 2 of 3
50PK950 Logo Familiarization Page 2 of 3
Invisible Speaker
Personally tuned by Mr. Mark Levinson for LG
TAKE IT TO THE EDGE newly introduces ‘Invisible Speaker’ system,
guaranteeing first class audio quality personally tuned by Mr. Mark
Levinson, world renowned as an audio authority. It provides Full Sweet
Spot and realistic sound equal to that of theaters with its Invisible
Speaker.
FULL HD RESOLUTION 1080P HD Resolution Pixels: 1920 (H) × 1080 (V)
Enjoy twice the picture quality of standard HDTV with almost double the pixel
resolution. See sharper details like never before. Just imagine a Blu-ray disc
or video game seen on your new LG Full HD 1080p TV.
HDMI (1.3 Deep Color) Digital multi-connectivity
HDMI (1.3 Deep color) provides a wider bandwidth (340MHz,
10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors,
and also drastically improves the data-transmission speed.
Dual XD Engine
Realizing optimal quality for all images
One XD Engine optimizes the images from RF signals as another XD
Engine optimizes them from External inputs. Dual XD Engine presents
images with optimal quality two times higher than those of previous
models.

15 October 2010 50PK950 Plasma
50PK950 Logo Familiarization Page 3 of 3
50PK950 Logo Familiarization Page 3 of 3
AV Mode "One click" Cinema, THX Cinema, Sport, Game mode.
TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode
which allows you to choose from 4 different modes of Cinema, Sports
and Game by a single click of a remote control.
Clear Voice Clearer dialogue sound
Automatically enhances and amplifies the sound of the human voice
frequency range to provide high-quality dialogue when background
noise swells.
Save Energy, Save Money
Home electronic products use energy when they're off to power features like clock
displays and remote controls. Those that have earned the ENERGY STAR use as much
as 60% less energy to perform these functions, while providing the same performance at
the same price as less-efficient models. Less energy means you pay less on your energy
bill. Draws less than 1 Watt in stand by.
Save Energy, Save Money
It reduces the plasma display’s power consumption.
The default factory setting complies with the Energy Star requirements
and is adjusted to the comfortable level to be viewed at home.
(Turns on Intelligent Sensor).

16 October 2010 50PK950 Plasma
(600 Hz Sub Field Driving)
•600 Hz Sub Field Driving is achieved by using 10 sub-fields per frame process
(vs. Comp. 8 sub-field/frame)
•No smeared images during fast motion scenes
600Hz Sub Field Driving
600Hz Sub Field Driving
Sub Field firing occurs using wall charge and polarity differences between Y-SUS and Z-SUS signals.
Original Image 10 Sub Fields Per Frame

17 October 2010 50PK950 Plasma
50PK950 Remote Control
50PK950 Remote Control
TOP PORTION
BOTTOM PORTION
p/n AKB729140002

18 October 2010 50PK950 Plasma
50PK950 Rear and Side Input Jacks
50PK950 Rear and Side Input Jacks
Either USB port for Software Upgrades,
Music, Videos and Photos and the
Wireless Dongle
AC In
USB 2
SIDE
INPUTS
REAR
INPUTS
HDMI 4
USB 1
Composite
Video/Audio
Cat 5
LAN
Wireless
Media Box
Remote
Jack

19 October 2010 50PK950 Plasma
Accessing the Service Menu
Accessing the Service Menu
To access the Service Menu.
1) You must have either Service Remote.
p/n 105-201M or p/n MKJ39170828
2) Press “In-Start”
3) A Password screen appears.
4) Enter the Password.
Note: A Password is required to enter the
Service Menu. Enter; 0000
Note: If 0000 does not work use 0413.
MKJ39170828
105-201M

20 October 2010 50PK950 Plasma
Software Updates (New and Changed Functions)
Software Updates (New and Changed Functions)
A wireless Internet Connection will work for Automatic Software Downloads., however if there are
problems completing download, a Wired Internet Connection is preferred
For network setup assistance, press the
green button for the Simple Manual
With Software Update
Highlighted, Press Select
on Remote
Continue on next page
Bring up the Customer’s
Menu then Press the Red
button on Remote Scroll down to item 9 Network Connections