LG 50PS60 Plasma TV Training Manual

Advanced Single Scan Troubleshooting Training Manual 50PS60 Plasma Display 50PS60 Plasma Display Updated September 17, 2009 Original: July, 2009

TOPICS PRELIMINARY ........................................ 2 Outline .......................................................... 2 Overview ...................................................... 3 Safety Notice and Cautions .......................... 4 ESD Notice .................................................. 5 Regulatory Info. ............................................ 5 Contact Information ..................................... 6 Handling and Safety ..................................... 7 Basic Troubleshooting Steps ........................ 8 PRODUCT INFORMATION ................... 9 Feature List .................................................. 10 Product Logos .............................................. 12 600Hz Sub Field Driving ............................. 15 Remote Control ............................................ 17 Accessing Service Menu .............................. 18 Rear and Side Inputs .................................... 19 Software Download Screen .......................... 20 Dimensions .................................................. 21 DISASSEMBLY ......................................... 22 Back Cover Removal ................................... 23 Circuit Board Layout ................................... 24 Power supply board Removal ...................... 25 Main board Removal .................................... 26 Control board Removal ................................ 27 50PS60 TABLE OF CONTENTS TOPICS DISASSEMBLY continued Y-SUS board Removal ................................. 28 Top Y-Drive board Removal ........................ 29 Bottom Y-Drive board .................................. 30 Z-SUS board Removal ................................. 31 Ft Control board Removal ............................ 32 X-Board Removal Text ................................ 33 X-Board Removal ......................................... 34 TROUBLESHOOTING ............................. 35 Signal and Voltage Block Diagram .............. 36 Panel Label Explained .................................. 37 Adjustment Order **Important** ................. 38 Power Supply ............................................... 39 Y-Sustain ...................................................... 51 Y-drive Upper and Lower ............................. 67 Z-SUS board ................................................. 77 Control board ................................................ 84 X-Drive boards ............................................. 99 Main (Digital) board ..................................... 112 Ft Control (IR) .............................................. 129 Side Key ....................................................... 137 11 X 17 Foldout Section ............................. 139 Page 1

2 Fall 2009 1080P Plasma 50PS60 Overview of Topics to be Discussed • Y SUS Board • Z SUS Output Board (Connects directly with FPC to Panel) • Y Drive Boards • Control Board • X Drive Boards (3) Circuit Board Operation, Troubleshooting and Alignment of : • Switch Mode Power Supply • Main Board Section 1 Section 2 Contact Information, Preliminary Matters, Specifications, Plasma Overview, General Troubleshooting Steps, Disassembly Instructions, Voltage and Signal Distribution OUTLINE OUTLINE • Power Button (Front Key Board) NEW Receives its 5V from Power Supply, not Y-SUS Turns off the SMPS via Key On line. NEW

3 Fall 2009 1080P Plasma 50PS60 50PS60 Plasma Display Section 1 This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician 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

4 Fall 2009 1080P Plasma 50PS60 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)

5 Fall 2009 1080P Plasma 50PS60 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)

New Training Materials on New Training Materials on the Learning Academy site the Learning Academy site Customer Service (and Part Sales) (800) 243-0000 Technical Support (and Part Sales) (800) 847-7597 USA Website (GCSC) aic.lgservice.com Customer Service Website us.lgservice.com LG Web Training lge.webex.com LG CS Academy lgcsacademy.com Published August 2009 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. http://136.166.4.200 LG Learning Academy 32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG90 42PG20, 42PQ20, 50PQ30, 50PG20, 50PS80, 50PS60 LCD-DV: PLASMA: Also available on Also available on the Plasma page the Plasma page Plasma Panel Alignment Handbook Page 6 Page 6 LG CONTACT INFORMATION LG CONTACT INFORMATION

7 Fall 2009 1080P Plasma 50PS60 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 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 inside the Panel when making adjustments on the Power Supply, Y SUS and Z SUS Boards. Always adjust to the specified voltage level. 3. 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. 4. C-MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity. 5. The PDP Module must be carried by two people. Always carry vertical NOT horizontal. 6. The Plasma television should be transported vertical NOT horizontal. 7. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit. 8. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry. 9. New Panels and Frames are much thinner than previous models. Be Careful with flexing these panels. Be careful with lifting Panels from a horizontal position. Damage to the Frame mounts or panel can occur. 10. New Plasma models have much thinner cabinet assemblies and mounts. Be extremely careful when moving the set around as damage can occur. Checking Points to be Considered SECTION 1: SECTION 1: PLASMA OVERVIEW PLASMA OVERVIEW

8 Fall 2009 1080P Plasma 50PS60 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 LED 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.

9 Fall 2009 1080P Plasma 50PS60 This section of the manual will discuss the specifications of the 50PS60 Single layer design. The 1080p Full HD resolution and THX Display certification makes this series the must have HDTV in 2009. Product Information Product Information

LG 50PS60 Plasma TV Training Manual

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