Download Black Box IC108C Specifications
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Direct View LCD 42LG60 Fall 2008 OUTLINE Section 1 Contact Information, Preliminary Matters, Specifications, LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages Section 2 Circuit Board Operation, Troubleshooting of : • Switch mode Power Supply • Main Board • Control Board • T-CON Board • Ft Control Board 2 LCD DV 42LG60 Overview of Topics to be Discussed 42LG60 LCD Direct View 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 LCD 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. 3 LCD DV 42LG60 Preliminary Matters (The Fine Print) 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 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. 4 LCD DV 42LG60 ESD Notice (Electrostatic Discharge Notice) 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 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. 5 LCD DV 42LG60 CONTACT INFORMATION 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 http://136.166.4.200 LCD-DV: 32LG40, 32LH30, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG90 PLASMA: 42PG20, 42PQ20, 42PQ30, 50PG20, 50PS80, 50PS60 Also available on the Plasma page Plasma Panel Alignment Handbook New Training Materials on the Learning Academy site Published August 2009 by LG Technical Support and Training LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813. 6 LCD DV 42LG60 Safety and Handling and Checking Points Safety and Handling Regulations 1. Approximately 20 minute pre-run time is required before any adjustments are performed. 2. Refer to the Voltage Sticker on the Switch Mode Power Supply silk screening. (+/- ½ volt). 3. Be cautious of electric shock from the Backlight section, it uses high voltage AC. 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 sensitive to static electricity. Use caution when dealing with these IC and circuits. 5. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit. 6. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry. Checking Points to be Considered 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: Oscillator failure dead set, etc… 7 LCD DV 42LG60 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. 8 LCD DV 42LG60 42LG60 PRODUCT INFORMATION SECTION Side View This section of the manual will discuss the specifications of the 42LG60 “Thin” LCD Direct View Display Panel. 9 LCD DV 42LG60 Basic Specifications • Full HD 1080p Resolution (1920 x 1080) • 50,000:1 Dynamic Contrast Ratio • TruMotion 120Hz • 4x HDMI™ V.1.3 with Deep Color • Intelligent Sensor • 24p Real Cinema • AV Mode (Cinema, Sports, Game) • Clear Voice • LG SimpLink™ Connectivity • Invisible Speaker System • USB 2.0 (JPEG, MP3) • ISFccc 10 LCD DV 42LG60 LOGO Familiarization Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. TruMotion 120Hz Advance 120Hz panel provides clear, smooth images, even during fast action scenes creating a stable structure for a crisper picture. Intelligent Sensor Unlike other sensors which can only sense brightness of ambient light, LG’s “Intelligent Sensor” uses 4,096 sensing steps to evaluate its surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness and white balance. The result is a picture optimized for it’s surroundings, more pleasing to watch and which can also save up to 50% in power consumption. 24p Real Cinema Hi-def movies run at exactly 24 frames per second speed that they were originally filmed in, making your home-cinema experience one step closer to a “Real Cinema” experience. Clear Voice Technology Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells. 11 LCD DV 42LG60 Remote Control BOTTOM PORTION TOP PORTION 12 LCD DV 42LG60 Accessing the Service Menu REMOTE TOP PORTION SIDE KEYS To access the Service Menu. 1) Turn the Set On 2) Simultaneously, Press and “Hold” the Menu Key on the Side Key pad and Press and “Hold” the Menu Key on the Remote approximately 5 seconds. 3) If Customer’s Menu appears, continue to hold until it disappears. 4) The Service Menu appears Note: Dependant upon the Software Version, a Password may be required to enter the Service Menu. If a password is required, enter 0000 13 LCD DV 42LG60 Rear and Side Input Jacks Rear Input Jacks Side Input Jacks Main PWB Orientation 14 LCD DV 42LG60 USB Download Screen (Software Update) 1) Create an LG_DTV folder on the USB Flash Drive Shows the Currently Installed Version 2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file. 3) With TV turned on, insert USB flash drive. 4) You can see the message “TV Software Upgrade” (See figure to right) 5) Cursor left and highlight "START" Button and push “Enter” button using the remote control. 6) You can see the download progress Bar. 7) Do not unplug until unit has automatically restarted. 8) When download is completed, you will see “COMPLETE”. 9) Your TV will be restarted automatically. Shows the Software Version found on the USB Flash Drive Shows the Software file found on the USB Flash Drive * CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process. 15 LCD DV 42LG60 42LG60 Dimensions There must be at least 4 inches of Clearance on all sides 40-7/8" 1038.86mm 7-7/8" 200mm 15-13/16" 402mm 8" 204.4mm 6-5/8" 168.78mm Center 31-5/16" 795mm 29-3/8" 746.76mm 14-11/16" 373.38mm 2-3/8" 60.96mm 11-7/8" 301mm 3-7/8" 100mm Model No. Serial No. Label Remove 4 screws to remove stand for wall mount 1-15/16" 49.2mm Weight without Stand: 45 lb Weight with Stand: 53.1 lb 20-1/2" 520.7mm 16 14-7/8" 376.46mm DISASSEMBLY AND TROUBLESHOOTING SECTION This section of the manual will discuss disassembly and troubleshooting. Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems. 17 LCD DV 42LG60 Removing the Back Cover The Stand does not need to be removed Remove the 13 screws indicated. Pay attention to the size and type of screw as there are many different types. Putting in the improper screw when reassembling may Cause damage. 18 LCD DV 42LG60 Circuit Board Layout T-CON EAT56803901 (Shield Removed) LVDS Cables Backlight Power Connection Backlight Power Connection LVDS Cables TruMotion Board Ft Control Board Side Key Board Side Inputs POWER SUPPLY (SMPS) Board Touch LED Main “Digital” Board Invisible Speakers 19 LCD DV 42LG60 Backlight Information Back View 18 Bulbs To Backlights Over 1.2KV Power Supply with Ballast EEFL (External Electrode Fluorescent Lamp) LOW COST Large number of lamps driven by a single inverter 2.8V~3.1V RMS 20 58Khz LCD DV 42LG60 Introducing EEFL and CCFL Simple structure, Low price Simple structure Complicated structure Lamp manufacturing process Lamp assembly structure 21 Low Cost Large number of Lamp Drive by single inverter LCD DV 42LG60 Electrode Differences between the EEFL and CCFL Key: Long Life Time • For CCFL, Hg gas is consumed mainly near the internal electrode • For EEFL, longer life time is expected because there is no internal electrode consuming Hg gas 22 LCD DV 42LG60 POWER SUPPLY (SMPS) PWB SECTION P2 To Main P401 Heat Sink is Hot Ground Shock Hazard Ballast Section P402 F700 5A/250V 335V INPUT AC 100V ~ 240V (50/60Hz) 3A OUTPUT P401 and P402 TO BACKLIGHT CONNECTORS AC IN F101 8A/250V AC IN St-by 5.2V (5A) 12V (2A) 16.5V (1.3A) P401-P402 950V / 135mA MODEL PLHL-T715A 23 LCD DV 42LG60 42LG60 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB POWER SUPPLY (SMPS) In Stand-By Primary Side is 178V In Run it is 380V BALLAST SECTION Drive Sig Bridge Rectifyer AC Det Circuit 6 Stand By 5V Reg Inverter On 12V/24V Regulators 8 1.2Kv 45Khz 1.2Kv Ballast Driver FETs 160V/380V Regulators AC In 1 6 Inverter On Starts the Ballast Drive Signal Manipulates Backlights Backlights turn On 9 11 P-DIM AC Det At point 4 TV is in Stand-By state. Energy Star compliant. Less than 1 Watt Stand By 5V 12V 16V DC Up, Backlight brightness Up 11 Inv On PWR 2 3 6 Other Regs 3.3V Other Circuits +5V General 6 5V Reg 6 2 Releases Reset Microprocessor Main Board 4 6 8 16V Audio 12V Video Processing Microprocessor IC407 7 Intelligent Sensor feedback LVDS Cables Tru-Motion Video Processing Video 10 BCM IC100 12V Video 12V 10 LVDS 12V MAIN PWB 8 P-DIM LVDS Cables Other Circuits Relay On (PWR) 3.3V Reg for Micon 6 A-DIM Fixed Cust Menu for Backlight 11 Picture Content 7 Video Mute Is Released 7 Inv On/Off LVDS Panel Control Ft Control 5 Reset Circuit 3.3V PG 24 TFT Controler Section 12V 7 To Panel LD1 (Blue LED) Blue LED lights to assist Backlight Lamp Firing Then goes off. Remote or Key Power On 42LG60 P801 ON MAIN PWB TO SMPS 16V SMPS PWB P2 ERR ACD PWR INV ADIM PDIM SEL SYNC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ERROR AC DET PWR STV ADM PDS SEL SYNC C813 10uF P801 16V 16V Gnd Gnd 12V 12V Gnd Gnd 5V 5V 5V 5V Gnd Gnd Gnd Gnd 3.3V 4.57V 2.86V 3.29V 1.68V 3.38V 3.2V 0V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PDS (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD. Manipulates the Backlight Brightness via the BCM Chip Video content . Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. Also the Intelligent Sensor 0.9V ~ 3.2V Range VBR-B, P-DIM all the same meaning ADM (Analog Dimming not used) VBR-A, ADIM all the same meaning 12V MAIN PWB C852 0.1uF C895 0.1uF C851 100uF SBY5V C846 100uF C897 0.1uF 3.3VST Micon 5V MNT 0 C845 1uF R832 R7028 C848 0.1uF 4.7K 3.3K R462 6.8K AC DET R488 30K 22 R838 C847 0.1uF RL ON R485 0 R834 100 INV ON/OFF 0 R831 0 C844 0.1uF R860 C880 10uF 0.9V ~ 3.2V 25 P4.2/AD2 29 P7.0/ HBLANK 30 P5.7/ CLK02 31 P5.6 BCMPWM_VBR-A R174 22 L29 GPI0_27 IC100 BCM R859 C878 10uF R487 39 1K 6.8K This Output Value is Fixed 0 C843 0.1uF IC407 uP R465 R458 BCMPWM_VBR-B R175 22 J34 GPI0_28 Power Supply Backlight Drive Signal Effects PWMDIM manipulates the Burst Triangle Oscillator in the ballast drive IC. ADIM also manipulates the Burst Triangle Oscillator But it is not used. 26 LCD DV 42LG60 Power Supply PWB Test (1ST Test All But Backlights) P2 Connector disconnected from the Main PWB AC: Not applied when adding jumpers. Applied when making test. The Power Supply “MUST” be producing STAND-BY +5V and AC Det. (1) Short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor. (2) Apply AC to the PWB. This turns on the power supply except for the Ballast Section. Check the following: Pins 1 and 2 for +16V Pins 5 and 6 for +12V 27 LCD DV 42LG60 Power Supply PWB Test (2nd Test All Including Backlights) P2 Connector disconnected from the Main PWB. Apply AC after adding jumpers. If the 1st test was successful, continue. Leave original 10K in place. (2): Test the Backlights, jump Pin 19 (PWR) to Pin 20 (INV) and apply AC Power to the PWB. Observe the Backlights. If normal, the backlights should turn on and off 4 times then go off. If only ½ the backlights light, (Right side or Left Side), confirm connectors are OK. Check Transformer Left and Right center pins for signal. If OK, panel defective, backlight failure. If pulse is missing on one side (L or R Center) of the transformer, power supply defective. If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides. If only on one side, check fuse for open. If no 300V, replace Power Supply. If 300V DC is present, observe the L and R center legs on the left hand side of ballast transformer T701. Look for 58Khz pulse at 8.7V p/p. If yes, confirm connectors to backlight OK. If OK, then panel is defective. If no pulse is found, replace the Power Supply. 28 LCD DV 42LG60 Power Supply Ballast Board Field Issue Back Side of Power Supply PWB T701 Long leads from T701 are arcing through the insulator to ground Mounting Tabs may be bent T701 29 LCD DV 42LG60 Power Supply Connector P2 Odd Pins Voltage and Resistance P2 Odd "SMPS" to P801 "Main PWB" Not Used Not Used Pin Label STBY Run Diode Check 1 16V 0V 16V 0.94V 3 Gnd Gnd Gnd 0V 5 12V 0V 11.8V 1.32V 7 Gnd Gnd Gnd 0V 9 5V 5V 5.15V 1.49V 11 5V 5V 5.15V 1.49V 13 Gnd Gnd Gnd 0V 15 Gnd Gnd Gnd 0V 17 ERR 3.19V 3.3V OL 19 PWR 0V 2.86V OL 21 ADIM 0.1V 1.68V OL 23 SEL 0V 3.2V OL Resistance taken in Diode Mode with Connectors Removed 30 LCD DV 42LG60 Power Supply Connector P2 Even Pins Voltage and Resistance P2 Even "SMPS" to P801 "Main PWB" Not Used Pin Label STBY Run Diode Check 2 16V 0V 16V 0.94V 4 Gnd Gnd Gnd 0V 6 12V 0V 11.8V 1.32V 8 Gnd Gnd Gnd 0V 10 5V 5.15V 5.15V 1.49V 12 5V 5.15V 5.15V 1.49V 14 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V 18 ACD 4V 4.57V 1.85V 20 INV 0V 3.29V OL 22 PDIM 0V 3.38V OL 24 SYNC 0V 0V OL PDIM Pin 22 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100% Resistance taken in Diode Mode with Connectors Removed 31 LCD DV 42LG60 SMPS PWB Connector P401 or P402 Voltage and Resistance P401 or P402 Backlights Pin STBY Run Diode Check 1 0V >1Kvac 0V 2 0V >1Kvac 0V Caution: AC over 1Kv. Use extreme caution when reading this voltage. Operating Frequency 54Khz. Pins 1 and 2 are actually shorted together. (Either Plug) Reading between P401 and P402 actually reads the Transformer T701 windings. (0.1V) For a simple and safe test: Place the Oscilloscope Probe along side the wire from P401 and P402 connectors to the Ballast and a 17.5μ sec sine waveform should be measured this would be an indication that the ballast supply is functioning. Resistance taken in Diode Mode with Connectors Removed 32 LCD DV 42LG60 TRUMOTION PWB SECTION The Control PWB contains the MICRONAS chip IC101. This IC is a Full-HD Rate Converter with Motion Blur Removal and Film DeJuddering for 1080p 100/120 Hz LCD panels. •Vector Based Motion Compensation with Frame Rate Conversion (eliminates the need for 3:2 Pull Down) •Dual 10 bit LVDS input •Quadruple 12 bit LVDS output Motion Blur Removal increases the video frames by Interpolating a new image frame between each original frame (Motion Estimated Data Insertion) MEDI. Juddering is a phenomenon which appears on film based programming due to the 24 frames per second system used for recording, the picture develops visual artifacts when converted to 60 frames per second. 3:2 Pull Down was developed to eliminate this problem. Frame Rate Conversion (Real Cinema) eliminates the need for 3:2 Pull Down. 33 LCD DV 42LG60 TruMotion 120Hz ( Vector Based Motion Compensation) TruMotion 120 Hz can reduce blurring on fast moving scenes. TruMotion carefully analyses the picture signal by using advanced algorithms to automatically calculate a new image frame between each original frame (MEDI). Conventional 34 LCD DV 42LG60 24P Real Cinema Frame Rate Conversion eliminates the need for 3:2 Pull Down Conversion 35 LCD DV 42LG60 TruMotion PWB (With Shield) 36 LCD DV 42LG60 TruMotion PWB Removing the LVDS Cable Disconnect P101, P103 and P104 LVDS Cables CAUTION: When removing LVDS Cables, be careful. Press the release Tabs to avoid damage to PWB or to the Cable itself. LVDS Connectors Press in from the sides and lift out. 37 LCD DV 42LG60 TruMotion PWB (Layout with Shield Removed) X101 IC108 IC109 IC110 38 LCD DV 42LG60 TruMotion PWB Regulators Identified and Voltages (1) (1) (1) IC108 IC109 IC110 5 (1.2V) 4 (1.3V) 3 (0V) 2 (3.37V) 1 (3.29V) 5 (0V) 4 (1.79V) 3 (0V) 2 (3.36V) 1 (3.29V) 5 (2.5V) 4 (0V) 3 (0V) 2 (3.3V) 1 (3.37V) 39 LCD DV 42LG60 TruMotion PWB Crystal X101 Check 1.7Vp/p 20.25Mhz Only when set is on Control PWB X101 Location 40 LCD DV 42LG60 T-CON (TFT DRIVE) PWB SECTION LCD Controller Board The T Con IC UC1 receives from the Control Board at CN1 and CN2 Quadruple 12 Bit LVDS Signals which it processes into TFT Drive Signals which through connectors CN4 and CN5 control the LCD Panel. IC’s U15 and U16 are “Dynamic Ram IC’s which are High Speed Storage Devices used to store the data until it is time to be addressed. 12V is supplied to the T Con Board on connector CN1 from the Control Board ( easily measured at fuse F1). Diode LD1 is a boot up indicator and is helpful in troubleshooting as a quick indication of a loss of supply and or a Boot Up problem. LG Philips LCD Drive IC U15 UC1 U16 Next Slide gives greater layout details F1 41 T CON IC TL22970D LCD DV 42LG60 T-CON (TFT Drive) PWB (Shield Removed) p/n EAT56803901 To TFT Panel To TFT Panel CN5 CN4 US1 UC1 U15 U16 Remember to replace screws for ground purposes if turning on the set. F1 CN1 CN2 LD1 To Control 42 LCD DV 42LG60 T-CON (TFT DRIVE) PWB CHECKS Check the Regulator US1 for Correct Voltage 0V US1 1.8V 3.2V T-CON PWB LD1 F1 CN1 Check Fuse F1 for 12V Power Off Anode 0V Cathode 0V LED OFF 43 Use LD1 to determine if The boot up sequence of The T-CON is OK. This LED will turn bright Blue Shortly after power is applied then go out shortly after backlights illuminate if all is OK. Power 1st On Anode 11.6V Cathode 0V LED ON Power On Anode 11.6V Cathode 9.5V LED OFF LCD DV 42LG60 MAIN PWB SECTION Input Signal Processing The Broadcom or BCM IC100 is the main signal processing IC. and is responsible for : • ATSC, NTSC, and QAM • RS 232 service only Port • Wired Remote Port • (2) Component Inputs Y, Pr, Pb and Audio L R • (3) HDMI Inputs (back) (1) HDMI (Side Input) • RGB PC • USB (Side Input) • AV Composite • SIF and SAP Output Signals • Dual 10 Bit LVDS to the Control Board • Audio output signals to the Speakers • Digital Audio Output Coaxial and Optical • ON OFF Control 44 LCD DV 42LG60 Main PWB Layout Troubleshooting 42LG60 VIDEO PROCESSOR IC100 RUNS HOT, THIS IS NORMAL. LD803 3.3V-BCM OK LD803 1 16 If odd Video problems are found, use some freeze spray about IC100 and its circuits, If video returns to normal, PWB needs to be replaced. 45 LCD DV 42LG60 Main PWB (Back View) Regulator Layout IC400 1 2 3 SBY 0.4V 0V 0.4V RUN 3.37V 0V 3.39V IC805 BCM Reset IC100 Video Processor 1 2 3 4 5 SBY 0.V 0V 0V 0.4V 0.1V RUN 3.3V 5V 0V 3.39V 1.2V 3.3V BCM IC400 LVDS 12V Switch Output 5~8 (12V) Q902 Q901 LVDS 12V Switch Control IC805 IC802 IC101 IC405 IC810 IC405 1 2 3 SBY 3.29V 0V 0.6V RUN 3.31V 0V 0.6V IC802 1 2 3 SBY RUN 0V 5V 0.3V 3.3V 0V 0V 46 IC810 1 2 3 SBY 0V 0V 0.3V LCD DV RUN 0V 1.8V 3.31V 42LG60 Main PWB X400 and X200 Check Video Processor Crystal X200 780mVp/p 54Mhz Only when set is on Main PWB X200 Location Use left side of L206 X400 2.4Vp/p 24Mhz MAIN PWB Main PWB X400 Location Set on or off Microprocessor Crystal 47 LCD DV 42LG60 Main PWB LD803 Check LD803 MAIN PWB Main PWB LD803 Location Use LD803 as a visual aid. This lets you know if the +5V is being converted to 3.3V for the BCM chip IC100. If LD803 is illuminated, +3.3V is OK. Note: Only ½ of the dual LED is used. 48 LCD DV 42LG60 Main PWB Tuner Video and SIF Output Check Pin Location For Easy Access, pop the shield off the tuner Pin 14 Pin 16 Pin 16 Composite Video Pin 14 Audio SIF Pin 1 If you leave the shield on you can still access the same pins. Be careful not to accidentally ground out your test lead on the shield. (Note: This is a picture from a different model, but the concept is the same) Pin 3 Tuner B+ (5V) 49 LCD DV 42LG60 Main PWB Tuner Video and SIF Output Check USING SMTE COLOR BAR SIGNAL INPUT Pin 14 “SIF” Signal 850mVp/p 20nSec rate Pin 16 “Video” Signal MAIN PWB 1Vp/p 20uSec rate Tuner Location 50 LCD DV 42LG60 Main PWB LVDS P900 Output Check To confirm that the Main PWB is outputting Picture Content signals, check P900 (LVDS) cable for output. Check 11-22 and 27-38. This signals vary from each other, but looking for signals like the ones shown below on any of these pins will confirm the output of video content. This signal is using standard SMTE Color Bar output from a generator as the input source. Pin 11 P900 Location MAIN PWB This is just a sample of two pins on the LVDS. There are 24 pins carrying video. Pin 16 51 LCD DV 42LG60 Main PWB Connector P801 Odd Pins Voltage and Resistance P801 CONNECTOR "Main" Odd Pins to P2 "SMPS PWB" Pin Label STBY Run Diode Check 1 16V 0V 16V OL 3 Gnd Gnd Gnd Gnd 5 12V 0V 11.8V 3V 7 Gnd Gnd Gnd Gnd 9 5V 5V 5.15V 1.47V 11 5V 5V 5.15V 1.47V 13 Gnd Gnd Gnd Gnd 15 Gnd Gnd Gnd Gnd 17 ERR 3.19V 3.3V 2.89V 19 PWR 0V 2.86V 1.1V 21 ADM 0.1V 1.68V OL 23 SEL 0V 3.2V OL Resistance taken in Diode Mode with Connectors Removed Pin 17 ERR is not used. Pin 21 ADIM is a fixed voltage. Pin 23 SEL is not used. 52 LCD DV 42LG60 Main PWB Connector P801 Even Pins Voltage and Resistance P801 CONNECTOR "Main" Even Pins to P2 "SMPS PWB" Pin Label STBY Run Diode Check 2 16V 0V 16V OL 4 Gnd Gnd Gnd Gnd 6 12V 0V 11.8V 3V 8 Gnd Gnd Gnd Gnd 10 5V 5.15V 5.15V 1.47V 12 5V 5.15V 5.15V 1.47V 14 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 18 AC Det 4V 4.57V OL 20 STV 0V 3.29V 1.8V 22 PDS 0V 3.38V OL 24 SYNC 0V 0V OL Pin 22 PDIM can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100% Pin 24 is not used Resistance taken in Diode Mode with Connectors Removed 53 LCD DV 42LG60 Main PWB Connector P401 Voltage and Resistance P401 CONNECTOR "MAIN PWB" to "Front PWB Assy" Pin LABEL STBY Run Diode Check 1 EYEQ-SCL 3.25V 3.25V 2.26V 2 EYEQ-SDA 3.25V 3.25V 2.26V 3 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd 5 Key1 3.3V 3.3V 1.85V 6 Key2 3.3V 3.3V 1.85V 7 3.3V 3.3V 3.3V 0.71V 8 5V 5V 5V 1.47V 9 EYEQ-Reset 0V 0V Gnd 10 IR 3.92V 3.92V 1.35V 11 SPKN 0V 0V OL 12 Gnd 0V 0V Gnd 13 SPKP 0V 0V OL 14 n/c 0V 0V OL 15 Gnd 0V 0V Gnd Resistance taken in Diode Mode with Connectors Removed 54 LCD DV 42LG60 Main PWB Connector P800 and P501 Voltage and Resistance P800 CONNECTOR "Main" Odd Pins to P102 "Control PWB" Pin SBY Run Diode Check 1 0V 5V 0.8V 2 0V 5V 0.8V P501 CONNECTOR "Main" to "Speakers" 3 0V 0V Gnd Pin SBY Run Diode Check 4 0.5V 3.3V 0.55V 1 0V 8V 2.58V 5 0V 0V Gnd 2 0V 8V 2.58V 6 0V 16V OL 3 0V 8V 2.58V 7 0V 16V OL 4 0V 8V 2.58V 8 0V 0V Gnd 9 3.3V 3.3V 1.39V 10 3.3V 3.3V 1.28V 11 3.3V 3.3V 1.24V 12 3.3V 3.3V 1.29V 13 3.3V 0V 1.35V Use speaker out to test for defective Audio Amp IC501 Resistance taken in Diode Mode with Connectors Removed 55 LCD DV 42LG60 Main PWB Connector P900 “Odd Pins” Voltage and Resistance Switched LVDS 12V SCL Video Signal Pins n/c Video Signal Pins n/c Pin SBY Run Diode Check 1 0V 11.7V OL 3 0V 11.7V OL 5 0V 0V Gnd 7 0V 0V Gnd 9 0.47V 3.3V 1V 11 0V 1.14V 1V 13 0V 1.11V 1V 15 0V 1.12V 1V 17 0V 1.11V 1V 19 0V 1.16V 1V 21 0V 1.14V 1V 23 0V 0V OL 25 0.5V 3.15V 2.98V 27 0V 1.14V 1V 29 0V 1.12V 1V 31 0V 1.14V 1V 33 0V 1.07V 1V 35 0V 1.16V 1V 37 0V 1.16V 1V 39 0V 0V OL 56 P900 CONNECTOR "Main" Odd Pins to P104 "Control PWB" Resistance taken in Diode Mode with Connectors Removed LCD DV 42LG60 Main PWB Connector P900 “Even Pins” Voltage and Resistance Switched LVDS 12V SDA Video Signal Pins FRC Reset Video Signal Pins Resistance taken in Diode Mode with Connectors Removed Pin SBY Run Diode Check 2 0V 11.7V OL 4 0V 11.7V OL 6 0V 0V Gnd 8 0V 0V Gnd 10 0V 3.3V 1V 12 0V 1.14V 1V 14 0V 1.11V 1V 16 0V 1.05V 1V 18 0V 1.11V 1V 20 0V 1.07V 1V 22 0V 1.05V 1V 24 0V 3.25V 1.28v 26 0V 3.3V 3V 28 0V 1.14V 1V 30 0V 1.09V 1V 32 0V 1.07V 1V 34 0V 1.13V 1V 36 0V 1.07V 1V 38 0V 1.07V 1V 40 0V 0V Gnd 57 P900 CONNECTOR "Main" Even Pins to P104 "Control PWB" Resistance taken in Diode Mode with Connectors Removed LCD DV 42LG60 FRONT TOUCH AND LED PWB SECTION J1 Front PWB Assembly To Main 58 LCD DV 42LG60 Front Touch LED Connector J1 Voltage and Resistance J1 CONNECTOR “Ft LED Touch" to J2 “Ft Control PWB" Pin STBY Run 1 3.3V 3.3V 2 3.3V 3.3V 3 5V 5V 4 0V 0V 5 0V 0V 6 0V 0V 7 3.3V 3.3V 8 0V 0V 9 3.3V 3.3V With all Connectors Removed, no ground return. 59 LCD DV 42LG60 Front PWB Assembly Layout Right Tweeter The Intelligent Sensor and IR Sensor are located on the front of this PWB J2 To Front Touch LED PWB J1 To Main PWB Light Diffuser for the Intelligent Sensor To Side Key Control PWB J3 IR Sensor 60 LCD DV 42LG60 Front Control Connector J1 Voltage and Resistance J1 CONNECTOR "Front Control PWB" to "MAIN PWB" P401 Pin LABEL STBY Run 1 EYEQ-SCL 3.25V 3.25V 2 EYEQ-SDA 3.25V 3.25V 3 Gnd 0V 0V 4 Gnd 0V 0V 5 Key1 3.3V 3.3V 6 Key2 3.3V 3.3V 7 3.3V 3.3V 3.3V 8 5V 5V 5V 9 EYEQ-Reset 0V 0V 10 IR 3.92V 3.92V 11 SPKN 0V 0V 12 Gnd 0V 0V 13 SPKP 0V 0V 14 n/c 0V 0V 15 Gnd 0V 0V 61 With all Connectors Removed, no ground return. LCD DV 42LG60 Front Control Connector J2 Voltage and Resistance J2 CONNECTOR “Ft Control” to “Ft Touch LED" J1 Pin STBY Run 1 3.3V 3.3V 2 3.3V 3.3V 3 5V 5V 4 0V 0V 5 0V 0V 6 0V 0V 7 3.3V 3.3V 8 0V 0V 9 3.3V 3.3V J3 CONNECTOR “Ft Control” to “Side Controls" P100 Pin STBY Run 1 3.3V 3.3V 2 0V 0V 3 3.3V 3.3V 4 0V 0V With all Connectors Removed, no ground return. 62 LCD DV 42LG60 SIDE KEYBOARD (FUNCTION KEYS) SECTION P100 To Front Control PWB 63 LCD DV 42LG60 Side Control Connector P100 Voltage and Resistance P100 CONNECTOR “Side Control” to “Front Control" J3 Pin STBY Run 1 3.3V 3.3V 2 0V 0V 3 3.3V 3.3V 4 0V 0V With all Connectors Removed, no ground return. 64 LCD DV 42LG60 INVISIBLE SPEAKER SECTION Right Tweeter Left Tweeter Right Speaker Box Left Speaker Box 65 LCD DV 42LG60 Speaker Box Assembly Removed Speaker Box Removed To Tweeters To Remove Speaker Box, remove the 4 screws show in circles remove wire harness. Carefully disconnect both Tweeters. Unplug P500 from Main PWB. 66 LCD DV 42LG60 DISASSEMBLY SECTION This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42LG60 LCD Direct View Television. Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printed circuit boards and be able to identify each board. 67 LCD DV 42LG60 Power Supply PWB Removal Disconnect P2, AC In, P402 and P402 Remove the 6 screws indicated below in red. 68 LCD DV 42LG60 MAIN PWB Removal Disconnect P401, P501, P800, P801 and P900 Note: In the bottom right is a connector P200. This is an open connection. Remove the 2 screws securing the Side input decorative plastic piece on the right. Remove the 6 screws securing the Main PWB indicated below in red. The Main PWB can also be lifted off the mounting frame by; Disconnect P401 and P501. Remove the 1 screw securing the top mounting frame. Swing the PWB away. 69 LCD DV 42LG60 TruMotion PWB Removal LVDS Cables Press in from sides to release Disconnect P101, P102 P103 and P104 Remove the 4 screws indicated below in red. 70 LCD DV 42LG60 T-CON (TFT Drive) PWB Removal Disconnect CN1, CN2, CN3 and CN4 Remove the 3 screws indicated below in red. 71 LCD DV 42LG60 11 X 17 FOLDOUT SECTION This section shows the 11X17 foldout that’s available in the Paper and Adobe version of the Training Manual. The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier. This Power Point shows a graphical representation of the 11 X 17 foldout page so clarity is limited. 72 LCD DV 42LG60 42LG60 CIRCUIT INTERCONNECT DIAGRAM TFT PANEL LD1 Blue LED TFT Drive PWB Check SET 0FF LED OFF Anode 0V Cathode0V BOOT OK LED ON Anode 11.6V Cathode 0V US1 SET ON LED OFF Anode 11.6V Cathode 9.5V 0V 3.2V CN5 U15 The appearance of LD1 when the set is on appears to be lit dimly. However there is a small hole in the back panel frame and the T-CON PWB that allows the backlight to make it appear lit. 1.8V FRONT SIDE OF MAIN PWB CN4 LD1 UC1 U16 TFT-Drive (T-CON) P2 "SMPS" to P801 "Main PWB" Odd Pins Label STBY Run Pin Label 16V 0V 16V 2 16V Gnd Gnd Gnd 4 Gnd 12V 0V 11.8V 6 12V Gnd Gnd Gnd 8 Gnd 5V 5V 5.15V 10 5V 12 5V 5V 5V 5.15V 14 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 18 ACD ERR 3.19V 3.3V 20 INV PWR 0V 2.86V 22 *PDIM ADIM 0.1V 1.68V 24 SYNC SEL 0V 3.2V Pin 1 3 5 7 9 11 13 15 17 19 21 23 Left Backlight Plug CN1 STBY 0V Gnd 0V Gnd 5.15V 5.15V Gnd Gnd 4V 0V 0V 0V Run 16V Gnd 11.8V Gnd 5.15V 5.15V Gnd Gnd 4.57V 3.29V 3.38V 0V Pins 17, 23 and 24 Not Used 1 4 3 6 5 8 7 10 9 12 11 14 13 16 15 10K 18 17 20 19 22 21 24 23 IC802 (On Back) 3.3V Regulator Function Pin Volts 1 0V Gnd Out 2 3.3V In 3 5V n/c Gnd IC805 (On Back) 3.3V Switching Regulator A3.3V-BCM 4 5 0.0V 0.0V Use L801 left side to test output Use any top pin of IC807 to test input IC806 IC820 1.2V Switching Regulator A1.2V-BCM 9V Regulator Function Pin Volts Function Pin Volts Name In (+12V) 1 11.6V In 6,7,8,10 5V Gnd Out 2 3 0.0V 9V Out On/Off IC404 3.3V Regulator LVDS Function Gnd Pin 21 is a Fixed Voltage Out In 1,2,3,4,5 1.2V 17 Pin Volts 1 0V 2 3 3.3V 5V P103 X101 20.25Mhz IC103 1st” short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor. This turns on the power supply. 2nd: To test the Backlights, jump Pin 20 (INV) to Pin 19 (PWR) Observe the Backlights. If normal, the backlights should turn on and off 4 times. Then they go off. If only ½ the backlights light, (Right side or Left Side), confirm connectors are OK. If yes, panel defective. If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides. If on one side, check fuse for open. If no 300V, replace Power Supply. If 300V present, observe the center leg on the left hand side of ballast transformer T701. Look for 45Khz pulse at 8.7V p/p. If yes, confirm connectors to backlight OK, if OK, then panel defective. If no pulse, replace the Power Supply. Scope test point Backlight pulse over 1000V p/p (45KhZ) P402 Ballast Section POWER SUPPY F700 5A 250V 335V P401 Side Control Keys P100 P2 F101 8A 250V AC AC In F700 90V in Stand-By Function Pin In 3 Out Gnd Pin 3 Volts 5V Name ST_+5V 2 1 3.3V 0V Reset Gnd 2 1 B E Volts ST-5V RL-ON (PWR) 0V Pin 1 2 3 Volts 3.3VST-MICOM 0.0V Low to High to B Q400 Q902 (On Back) 12V LVDS control to Q901 Function Source 1.8V (+1.8V-NTP) 0V Control Gnd Pin C Volts 12V B E LVDS-Panel-Control 0V Q901 (On Back) 12V LVDS On control to P900 Pins 1~4 Q802 (On Back) 5V Switch control to Q801 Control Gnd P101 Function In Gnd Out Volts 3.3V from IC802 Function Pin In C ST-5V P104 Volts RL-ON (PWR) 0V Function Source Pin 1, 3 12V Volts Control Output 2, 4 5~8 Low from Q902 12V LVDS IC101 TRU-MOTION P102 Right Backlight Plug Tuner Pin 16 SMTE Color bar In IC108 IC109 IC110 IC109 IC108 5 (0V) 5 (1.2V) 4 (1.79V) 4 (1.3V) 3 (0V) 3 (0V) 2 (3.37V) 2 (3.36V) 1 (3.29V) 1 (3.29V) IC110 5 (2.5V) 4 (0V) 3 (0V) 2 (3.3V) 1 (3.37V) See back side of page for Waveforms for P900 using SMTE Color bar as the Input. MAIN PWB Pin 24 Pin 23 Function Pin Volts In 2 5V Out 4 3.3V (A3.3V-BCM) On/Off 1 Power Control-3.3V Pin C B E IC405 uP Reset (On Back) Reset by Charge of C431 IC810 (On Back) IC404 uP 3.3V 3.3VST-MICOM Function In Q801 (On Back) 5V Switch Function Source Control Gnd Power Control 1.8V Switching Regulator +1.8V-NTP Use L014 left side to test output Use any top pin of IC820 to test input Out Gnd IC102 P2 CN2 3A 125V 11.6V PDIM Pin 22 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100% 2 F1 BACK SIDE OF MAIN PWB IC800 IC807 5V Switching Regulator 2.6V Switching Regulator A2.6V-BCM Function Pin Volts Function Pin Volts Name In from IC806 1 8.95V In 6,7,8,10 5V On/Off 2 3.3V Out 1,2,3,4,5 2.6V Power Control Out (+5V-TU) 3 5.0V On/Off 17 IC600 P801 Tweeter Spk Tweeter Ft. PWB Assy. J1 J2 J3 IC503 IC701 LG J1 Ft. TOUCH LED/Push Sw IC500 Pin 1 ~ 16 TUNER 5V Pin 3 Video Pin 16 Audio SIF Pin 14 1 16 TUNER ATSC/QAM/ NTSC IC900 IC806 IC800 P501 IC302 IC100 BCM *IC805 *IC802 X200 (54Mhz) *IC810 IC501 IC807 IC1201 P900 P800 *Q902 *Q901 LD803 3.3V BCM *IC400 Reset IC805 BCM OK LED IC402 Spk IC820 IC300 IC1200 IC303 IC202 IC301 24Mhz X400 IC1000 P401 IC304 IC404 Q400 E B uP IC407 *IC405 P200 Not Used *Grayed out components on the back LVDS CABLE P900 FROM MAIN PWB TO CONTROL PWB P101 USING SMTP COLOR BAR INPUT LAST TWO WAVEFORMS ARE FROM THE TUNER Measurements +/- 5% 42LG60 Conclusion This concludes the 42LG60 training package presentation.