LG Infinia 47LE8500 Manual
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LG Infinia 47LE8500 Manual

LG Infinia 47LE8500 Manual

Led backlights direct view lcd training lcd-dv 47" class full hd 1080p lcd tv (47" diagonally)
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Download this manual See also: Service Manual, Owner's Manual
1080P
1080P
Direct View LCD
Training
47LE8500
47LE8500
47LE8500
47LE8500
LED Backlights
LCD-DV Troubleshooting
47" Class Full HD 1080P
LCD TV (47" diagonally)
Published July 23, 2010
Updated December 06
th
, 2010

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Summary of Contents for LG Infinia 47LE8500

  • Page 1 1080P 1080P 47LE8500 47LE8500 47LE8500 47LE8500 Direct View LCD LED Backlights Training LCD-DV Troubleshooting 47" Class Full HD 1080P LCD TV (47" diagonally) Published July 23, 2010 Updated December 06 , 2010...
  • Page 2 Board Operation Troubleshooting of : • Switch Mode Power Supply • Inverter Boards Main and Secondary (LED Backlight Drivers) • Main Board • Extension Boards • Ft Control Board • Soft Touch Keys • Speakers July 2010 LCD TV 47LE8500...
  • Page 3 Overview of Topics to be Discussed Overview of Topics to be Discussed 47LE8500 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.

  • Page 4: Preliminary Matters (The Fine Print)

    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.

  • Page 5: Esd Notice

    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. July 2010 LCD TV 47LE8500...

  • Page 6: Lg Contact Information

    PDP Panel Alignment Handbook, the Learning Academy site the Learning Academy site Plasma Control Board ROM Update (Jig required) Published July 2010 by LG Technical Support and Training LG Electronics Alabama Inc LG Electronics Alabama, Inc. 201 James Record Road, Huntsville, AL, 35813.

  • Page 7: Lcd Direct View Overview

    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… July 2010 LCD TV 47LE8500...

  • Page 8: Basic Troubleshooting Steps

    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. July 2010 LCD TV 47LE8500...
  • Page 9 47LE8500 PRODUCT INFORMATION SECTION 47LE8500 PRODUCT INFORMATION SECTION This section of the manual will discuss the specifications of the 47LE8500 LCD Direct View Display July 2010 LCD TV 47LE8500...
  • Page 10 2. Wired Remote cable between the TV and Dongle for Control Functions. Media Box Wired Remote to control the Media Box TV A/V Inputs Wireless Receiver/Transmitter “Dongle” Attaches via Velcro to the back of the set HDMI July 2010 LCD TV 47LE8500...
  • Page 11 Wireless LAN (DLNA Adaptor) Wireless LAN (DLNA Adaptor) Wireless LAN (Sold Separately) Using the LG Wireless LAN for Broadband/ DLNA Adaptor, which is sold separately, allows the TV to connect to a wireless LAN network. The DLNA adaptor attaches to...

  • Page 12: Basic Specifications

    • 4 HDMI™ V.1.3 w/Deep Color • Seamless Design • SIMPLINK™ Connectivity • Picture Wizard II • Dolby® Digital 5.1 Decoder (Easy Picture Calibration) • Infinite Sound • Smart Energy Saving • ENERGY STAR® Qualified July 2010 LCD TV 47LE8500...
  • Page 13 47LE8500 Logo Familiarization Page 1 of 4 47LE8500 Logo Familiarization Page 1 of 4 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.
  • Page 14 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,...
  • Page 15 47LE8500 Logo Familiarization Page 3 of 4 47LE8500 Logo Familiarization Page 3 of 4 AV Mode "One click" Cinema, 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.
  • Page 16 TruMotion 240Hz See sports, video games and high-speed action with virtually no motion blur and in crystal clarity with LG’s TruMotion 240Hz technology. Now your TV can keep up with the fastest moving scenes. July 2010 LCD TV...
  • Page 17 47LE8500 Remote Control 47LE8500 Remote Control BOTTOM PORTION p/n AKB72914003 TOP PORTION July 2010 LCD TV 47LE8500...

  • Page 18: Accessing The Service Menu

    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 July 2010 LCD TV 47LE8500...
  • Page 19 Rear In/Out Jacks Rear In/Out Jacks USB 2 USB 2 USB 1 USB 1 Component or Composite Video/Audio 3 Head Wireless Media Box Phones Remote Jack MAIN BOARD Rear and Side Input/Output locations HDMI 4 July 2010 LCD TV 47LE8500...

  • Page 20: Software Updates (New And Changed Functions)

    Simple Manual Bring up the Customer’s Menu then Press the Red button on Remote Scroll down to item 9 Network Connections With Software Update Highlighted, Press Select on Remote Continue on next page July 2010 LCD TV 47LE8500...
  • Page 21 SW version and serial No. is displayed. Note: Confirm the “Suffix” of the model number. If the Main board is replaced, the Model and Serial number must be reinserted into memory. See Model Number D/L. July 2010 LCD TV 47LE8500...
  • Page 22 Do not remove AC power or the USB Flash Drive. restarted. Do not turn off Power, during the upgrade 8) When download is completed, you will see process. “COMPLETE”. Software Files are now available from 9) Your TV will be restarted automatically. LGTechassist.com July 2010 LCD TV 47LE8500...

  • Page 23: Manual Software Download

    Manual “Forced” Download Menu. Any file can be downloaded when selected and may cause the Main board to become inoperative Example of files found if the incorrect file On the Jump Drive was selected. July 2010 LCD TV 47LE8500...

  • Page 24: Service Menu: Adding The Model And Serial Number

    Use the cursor right or left to select the area to change. Use the cursor up or down to change. Cursor right until there is no text cursor blinking. Scroll down to highlight “Serial Number” and change. July 2010 LCD TV 47LE8500...

  • Page 25: Service Menu: Downloading Edid Data

    Service Menu: Downloading EDID Data Pg 1 of 2 Service Menu: Downloading EDID Data Pg 1 of 2 1) Press “ADJ” key. 2) Select menu, Either “PCM EDID D/L” or AC3 EDID D/L July 2010 LCD TV 47LE8500...
  • Page 26 Note: When PCM is downloaded, AC3 will be N/G and when AC3 is downloaded PCM will be N/G. This means that when PCM is OK, PCM audio is priority and when AC3 is OK, AC3 audio is priority. July 2010 LCD TV 47LE8500...
  • Page 27 47LE8500 Product Dimensions 47LE8500 Product Dimensions Wattage 1.3/8" There must be at least 4 inches of Clearance on all sides Local Dimming 90W 34.93mm Full White 130W 44.3/16" Stand By 0.1W 1122.68mm 8.7/16" 19.5/16" 214mm 490mm 7.7/8" 200mm Model No.

  • Page 28: Disassembly Section

    Disassembly: This section of the manual will discuss Disassembly, Layout (Circuit Board Identification) of the 47LE8500 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.

  • Page 29: Removing The Back Cover

    Putting in an improper screw when reassembling may Cause damage. The AC Cord Stand Base is Glass Does Not unplug Handle with Care The Stand has to be removed before removing the back. July 2010 LCD TV 47LE8500...

  • Page 30: Circuit Board Layout

    Inverter Secondary Inverter Main Power Supply (SMPS) Main Board LVDS Cables Warning: The Frame has Panel Connection Points very sharp edges IR/LED Soft Touch LG Logo Invisible Invisible Speaker Right Speaker Left Board Keyboard Board July 2010 LCD TV 47LE8500...
  • Page 31 47LE8500 Connector Identification Diagram 47LE8500 Connector Identification Diagram If the Panel is replaced, reset the UTTTime. Service Menu, System 1 Item 12 TFT PANEL p/n: EAJ60874401 (Model AUSWLH) p/n: AFB72949901 (AUSWLUR / AUSWLNR) CN11 CN22 CN33 V25~V32 V73~V80 V105~V112 p/n: AFB72950101...

  • Page 32: Power Supply Board Removal

    P201, P205, P204 and AC SK101 fits very In SK101. snug into it’s connector. Remove the 6 screws indicated by the arrows. Press in on the two tabs AC In to release lock SK101 July 2010 LCD TV 47LE8500...

  • Page 33: Removing The Main Board

    Main board holding the Metal plate in place. NOTE: Always check on top and behind the Large P8800 P8200 ICs. And look for a piece of Chocolate (Heat Transfer Material). Be sure to transfer to new Board if present. July 2010 LCD TV 47LE8500...
  • Page 34 Use caution, do not allow screws to fall. CN11 NOTE: If Servicing the Board, leave the screws installed to provide stability and grounding. On CN2, CN3, CN4 and CN5 Flip the locking tab upward, pull the ribbons out. July 2010 LCD TV 47LE8500...
  • Page 35 Use caution, do not allow screws to fall. CN103 CN105 NOTE: If Servicing the Board, leave the screws installed to provide stability and grounding. On CN104 and CN105 Flip the locking tab upward, pull the ribbons out. July 2010 LCD TV 47LE8500...
  • Page 36 Removing Front IR Board p/n EBR64966401 Disconnect CON1, CON2 and CON3 connectors. Press upward on the two tabs at the top. Tilt the board downward and lift straight up. CON3 IR board / Intelligent Sensor CON1 July 2010 LCD TV 47LE8500...

  • Page 37: Troubleshooting Section

    TROUBLESHOOTING SECTION TROUBLESHOOTING SECTION Troubleshooting: This section of the manual will discuss troubleshooting. Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems. July 2010 LCD TV 47LE8500...

  • Page 38: Power Supply Section

    24V is routed out P201 pins 2, 3 and 4. P204 Connector: (To Inverter Main Board) 24V is routed out P204 pins 1 through 5. P205 Connector: (To Inverter Secondary Board) 24V is routed out P205 pins 1 through 5. July 2010 LCD TV 47LE8500...
  • Page 39 Power Supply (SMPS) Board Layout Power Supply (SMPS) Board Layout p/n EAY60908801 F101 3.15A/250V STBY 2.9V Run 393.3V From Hot Gnd F501 3.15A/250V STBY 159.6V Run 392.6V From Hot Gnd F100 6.3A/250V AC Protect Hot Ground Shock Hazard July 2010 LCD TV 47LE8500...
  • Page 40 47LE8500 Power Supply Start Up Sequence 47LE8500 Power Supply Start Up Sequence CN101 CN104 POWER SUPPLY (SMPS) AC In P205 Inverter Primary side fuse: Stand-By 159.6V Secondary Run 392.6V (Hot Gnd) CN104 CN103 CN25~CN33 24V B+ for the Inverters No AC Det in...
  • Page 41 47LE8500 Television Turn On Commands Circuit Drawing 47LE8500 Television Turn On Commands Circuit Drawing R8003 22KΩ +12V Q8004 R8010 10KΩ L8000 To IC9103 DC to R8001 Panel_Vcc (12V) Q8003 Q8001 DC Conv T-CON R8011 1.8K 11.79V 11.8V 1.8V 0.68V R8103...
  • Page 42 Check that the 24V and 12V power supplies are turned on, • P201 (12V pins 17, 19 and 21) • P201 (24V pins 2, 3 and 4) • P204 and P205 (24V pins 1 through 5) to the Inverters (2) Remove AC power July 2010 LCD TV 47LE8500...
  • Page 43 Check the connections to the Inverters. If the 24V and the Inverter On command is arriving at the Inverters in, then see Inverter Section for further testing. Note: Either Inverter can run separately. REMOVE AC POWER: July 2010 LCD TV 47LE8500...

  • Page 44: Power Supply Connector P201 Voltage And Diode Check

    OSD Backlight setting and then Intelligent Sensor 11.9V 1.39V (room light condition) Output from the Video Processor Open IC900. Range 0.37V to 3.3V. Open ERROR Open Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 45 (1) PDIM Pin 20 can vary according to incoming video IRE level, OSD Backlight setting and then Intelligent Sensor (room light condition) Output from the Video Processor IC900. Range 0.37V to 3.3V. I-C is the Inverter On Control Signal Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 46 Pins 1 and 2 for STBY and RUN. F100 Bottom Right of SMPS F100 (Diode Check) Main Power Switch Closed F100 Red or Black Lead on Fuse (Open) Other Lead on Hot Ground 6.3A/250V AC IN SK101 July 2010 LCD TV 47LE8500...
  • Page 47 STBY 159.6V Run 392.6V From Hot Gnd STBY 2.9V Run 393.3V If reading the voltage on F101 right after power off, it takes a very long time to bleed down to the reading given here. July 2010 LCD TV 47LE8500...

  • Page 48: Inverter (Led Backlights) Section

    Each Extension board has 9 connections to the Backlight LEDs. There are 4 LEDs per/block, 216 Blocks, 8 Blocks per/cartridge, 3 Cartridges per/bar, 9 bars (rows), 32 LEDs per/cartridge, 96 LEDs per/bar. With a total of 864 LEDs. July 2010 LCD TV 47LE8500...
  • Page 49 IOP Structure Integrated Optic Plate IOP Structure Integrated Optic Plate The Image below shows the actual Backlight Bars used in the 47LE8500. The Cartridges are assembled from the bottom to the top, like shingles on a roof. Cartridge Cartridges Removed...
  • Page 50 IOP Structure Information 4 LEDs per/block (216 Blocks) 8 Blocks per/cartridge, 9 bars with 3 cartridges per/bar, 32 LEDs per/cartridge, 96 LEDs per/bar. 864 LEDs total. Cartridge BLU (Backlight Unit) Cartridge There are 3 Cartridges per/bar. July 2010 LCD TV 47LE8500...
  • Page 51 47LE8500 (IOP) Cartridge Breakdown 47LE8500 (IOP) Cartridge Breakdown Each Connector has 10 pins. 2 are B+ 13V and 8 block controls. Connector Slots Back Metal Plate The Individual LEDs Front Metal Plate can be checked using the Diode Mode forward bias test. The LED Bar 32 LEDs 4 LEDs per/block 8 blocks LED will light.
  • Page 52 47LE8500 IOP Block Structure Information 47LE8500 IOP Block Structure Information 47LE8500 TFT PANEL p/n: EAJ60874401 CN33 CN22 CN11 V73~V80 V25~V32 V105~V112 CN23 CN32 CN21 V81~V88 V33~V40 V113~V120 CN10 CN31 CN20 V1~V8 V41~V48 V121~V128 CN12 CN30 V9~V16 V49~V56 V29~V136 CN19 CN24...
  • Page 53 4. Sheet DBEFD 5. Sheet Prism U 6. Sheet Prism L 7. Sheet Diffuser L 8. Plate Diffuser 9. Cartridge Ass’y 10. Cover Bottom 11. Driver Boards (2) 12. Extension Boards (3) 13. FRC Flexible Ribbon Cables July 2010 LCD TV 47LE8500...
  • Page 54 47LE8500 Inverter Main Layout 47LE8500 Inverter Main Layout 24.6V A0950 12A/65V 24.6V 12.96V INVERTER (MAIN) BOTH INVERTERS L101 p/n: AFB72950101 U101 A0950 13V POWER SUPPLY For CN2 / CN3 13V POWER SUPPLY For CN4 / CN5 3.3V L102 U103 U501 L103 12.77V...
  • Page 55 47LE8500 Inverter Secondary Layout 47LE8500 Inverter Secondary Layout DO NOT U103 MEASURE 3.3V L207 Q108 F101 Q109 3.4V 12A/65V 24.6V INVERTER (SECONDARY) CN104 BOTH INVERTERS 24.6V U101 p/n: AFB72950101 Q106 C101 Y501 CN101 Q103 C151 8Mhz Q101 Q501 12.8V Q102...
  • Page 56 47LE8500 Inverter (Main) B+ Routing 47LE8500 Inverter (Main) B+ Routing To CN 1 Extension Left To CN 2 Extension Left CN3 B+ for LED Blocks. CN2 B+ for LED Blocks. Pins 1~2, 11~12, 21~22, Pins 9~10, 11~12, 31~32, 41~42. 21~22, 31~32 24.6V...
  • Page 57 47LE8500 Inverter (Secondary) B+ Routing 47LE8500 Inverter (Secondary) B+ Routing U103 3.3V DO NOT MEASURE L207 Q108 Q109 3.4V 24.6V To CN 23 F101 Extension Right 12A/65V DC to DC INVERTER (SECONDARY) CN104 B+ to LED Blocks pins Driver 24.6V...
  • Page 58 Q4, Q7 or Q105 Pin 3 30V p/p 296KHz 13.5V p/p 296KHz 30V p/p 296KHz Each of the Pin numbers for the Components listed Q5, Q8 or Q106 Pin 3 is Ground above are the same. July 2010 LCD TV 47LE8500...
  • Page 59 I2C data back to the Main board’s Microprocessor. Minimum P-DIM Voltage 0.37V 0% Cust Backlight Setting Backlights Dim Brightness and Contrast adjustments do not affect P-DIM Analog Dimming is not used. It is a fixed voltage. Also called BR1, VBR-A, BCM-VBR-A, ADM July 2010 47LE8500 LCD-DV...
  • Page 60 0.58V (Black Lead on Fuse) 12A/65V Top Left of the Board Inverter (Secondary) Just to the right of CN101 Connector F101 (Diode Mode Check) 1.385V (Red Lead on Fuse) 0.58V (Black Lead on Fuse) F101 12A/65V July 2010 LCD TV 47LE8500...
  • Page 61 Inverter Crystals Y1, Y501 (Main) and Y501 on (Secondary) Inform ation Inverter Crystals Y1, Y501 (Main) and Y501 on (Secondary) Inform ation Crystal Y301 Y501 Use Top Leg Inverter (Main) 8Mhz Inverter (Secondary) Y501 Use Bottom Leg July 2010 LCD TV 47LE8500...
  • Page 62 CN2 13V Line Pins CN3 13V Line Pins CN4 13V Line Pins CN5 13V Line Pins 1~2, 11~12, 9~10, 11~12, 1~2, 11~12, 21~22, 11~12, 21~22, 31~32, 9~10, 19~20, 29~30, 21~22,31~32, 41~42 21~22, 31~32 31~32, 41~42 41~42 39~40, 49~50 July 2010 LCD TV 47LE8500...
  • Page 63 Turn off the set and unplug the connector to the Inverters coming from the Main board. If the brightness returns to normal, the Main board is defective. If not, investigate all inverter voltages, if OK, use the grounding of each V block procedure to test the panel’s backlight LEDs. July 2010 LCD TV 47LE8500...
  • Page 64 CN4 pin 08 0.7V~3.9V white and black CN4 pin 07 0.7V~3.9V screens CN4 pin 06 0.7V~3.9V CN4 pin 05 0.7V~3.9V CN4 pin 04 0.7V~3.9V CN4 pin 03 0.7V~3.9V CN4 pin 02 12.55V CN4 pin 01 12.55V July 2010 LCD TV 47LE8500...
  • Page 65 Processor IC900. Range 0.37V to 3.3V. CN101 "Inverter Secondary" Connector To P205 "SMPS" Diode Label STBY Check 24.6V 0.42V 6~10 P-DIM 0.37V~3.3V Open 2.92V Open Inverter On Control Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 66 Open M2_SCLK 0.23V Open M1_MOSI *0.04V~3.26V Open M1_SCLK 0.23V Open Open Open S_CS_N 2.6V 1.65V S_MOSI *0.18V~0.28V 1.61V *Black to White S_SCLK 2.99V 1.62V *Black to White Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 67 Inverter Main and Secondary Local Dimming Control Signals Wavefo Inverter Main and Secondary Local Dimming Control Signals Wavefo For clearer details see the Interconnect Diagram July 2010 LCD TV 47LE8500...

  • Page 68: Main Board Section

    • 3.3V_TU IC9301 Tru-Motion and Dimming IC. • 1.26V_TU • 1.26V_MEMC, 1.5V_MEMC, WIRELESS VOLTAGES , D1.5V, D1.8V, and 3.3V • 24V (Switched from 24V from SMPS) •T-CON IC9001 • 3.3V_VCC, -5V_VGL, 25V_VGH, 16V_VDD and HVDD (7.7V) July 2010 LCD TV 47LE8500...

  • Page 69: Mainboard Layout

    See next page for VIDEO component PROCESSOR identification IC900, T-CON IC9001 and Tru-Motion IC9301 runs Hot. P9000 This is normal. P8100 Component These connectors are Mini plug type Wireless Remote P8800 To Speakers P8200 To Front IR July 2010 LCD TV 47LE8500...
  • Page 70 47LE8500 Main Layout 47LE8500 Main Layout P7501 P7500 P8000 P7901 IC9100 IC9102 IC8005 P7900 L9100 IC9301 L9102 LG5111 Q8005 Q8004 RX/TX IC9103 SW9300 Q8001 D9101 Tru-Motion and L8015 Q8003 Dimming IC D9102 Rubber IC9300 IC8008 SW9300 L9101 Reset IC9302 X9300...
  • Page 71 47LE8500 Main (Front Side) Component Voltages IC300 Earphone Amp IC700 (+1.26V_TU) IC8002 (D1.8V) IC8005 (+3.3V_NORMAL) IC8902 (+1.26V_MEMC) IC9102 DC to DC Regulator Regulator Regulator Regulator HVDD T-CON [1] 0V [1] 0V (Gnd) [1] 5V [1] 0V (Gnd) [1] 0V (Gnd)
  • Page 72 47LE8500 Main (Back Side) Layout 47LE8500 Main (Back Side) Layout Rubber Q8002 IC9101 Rubber Q8000 IC9303 IC9000 IC602 IC606 IC604 IC8100 Q901 D8312 Q8308 Q200 TU700 TDVJ-H031F Q8304 18. IF p Rubber 17. IF n IC8400 Q8301 16. IF AGC 15.
  • Page 73 47LE8500 Main (Back Side) Component Voltages IC602 D1.8V IC8400 IC8700 Wireless Q200 (1.8V_HDMI) Q8203 IR Wireless Pass Regulator H/V Sync Buffer Switch 2nd Driver [1] 0V (Gnd) [1] 1.9V [1] 0V (3.3V Dongle In) S 1.83V (Out) B 0V [2] 3.29V (PWR On/Off1 Ctl) [2] 1.9V...
  • Page 74 X9001 X9000 IC9001 T-CON Crystal Dimming Crystal 1.58V 2.54V p/p 1.56V 3.19V p/p Runs when set is On 4.86V p/p 1.6V 1.6V 3.27V p/p 25Mhz 12Mhz Runs when set is On X9001 X9000 MAIN Board July 2010 LCD TV 47LE8500...
  • Page 75 Either leg 2.26V p/p 1.52 1.3V 789mV p/p Either leg 10Mhz 54Mhz Runs all Runs when set is On The time MAIN Board 1.85V p/p 2.82V p/p X8100 X8101 X1001 1.5V 1.75V Runs all The time July 2010 LCD TV 47LE8500...
  • Page 76 Main Board DC to DC Converter (Voltages for Panel) Checks Location: Top Center of Board +7.81V L9100 HVDD IC9102 Panel 12V L9104 +16V B+ for IC9102 IC9103 L9102 D9101 Panel 12V +27V IC9103 L9101 +3.3V D9102 July 2010 LCD TV 47LE8500...
  • Page 77 Main Board Additional Panel Voltage Checks Location: Top Left of Board P7501 P7500 IC9101 Back Side of Board From IC9101 Pin 21 -4.8V (VDD-ODD) From IC9101 Pin 19 -4.7V (VST) From IC9101 Pin 20 -4.8V (VDD-EVEN) July 2010 LCD TV 47LE8500...
  • Page 78 Open Open ERROR PDIM Pin 20 can vary according to incoming video IRE level, OSD Backlight setting and Intelligent Sensor (room light condition). Diode Mode values taken with all Connectors Removed Range 0.37V to 3.3V. July 2010 LCD TV 47LE8500...
  • Page 79 1.09V CLK5 1.5V OPT_N 1.06V 2.06V CLK4 1.5V H_CONV 1.07V 3.3V 1.64V CLK3 1.5V VST_IN 1.06V 3.3V 1.64V CLK2 1.5V 0.62V 1.06V CLK1 1.5V 0.3V 1.06V HVDD 7.81V Open Z_OUT 7.7V Open HVDD 7.81V Open July 2010 LCD TV 47LE8500...
  • Page 80 Open RV3- 1.27V 0.9V GMA6 11.88V Open VCOM_IN 6.86V Open RV4+ 1.12V 1.09V GMA4 12.79V Open RV4- 1.22V 0.9V GMA3 13.5V Open 15.57V Open RV5+ 1.13V 1.09V GMA1 14.91V Open 15.57V Open RV5- 1.22V 0.9V July 2010 LCD TV 47LE8500...
  • Page 81 1.24V LED_LOGO Open 1.57V 1.54V Open +3.3V_Normal 3.3V 0.59V LED_R/BUZZ Open Clock pulses only present when Intelligent Sensor is turned on. (3.7V p/p) IR pulses (1.6V p/p) Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 82 0.23V 1.1V M1_MOSI *0.04V~3.26V 1.08V M1_SCLK 0.23V 1.08V M3_MOSI 1.1V M3_SCLK 1.1V S_CS_N 2.6V 1.08V S_MOSI *0.18V~0.28V 1.08V *Black to White S_SCLK 2.99V 1.08V *Black to White Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 83 Pin 25 P8800 CONNECTOR "Main" to "Speakers" LABEL Diode Check IC8801 SPK-R(-) 12.3V Open SPK-R(+) 12.3V Open Audio B+ SPK-L(-) 12.3V Open Pins 49-52 SPK-L(+) 12.3V Open P8800 Diode Mode values taken with all Connectors Removed July 2010 LCD TV 47LE8500...
  • Page 84 Remove cover, (see Wireless Media Box training manual for details). *24V Switched from Q8701 Drain Back side of the board. Q8701 turned on by Q8700 front side of the board. Q8700 turned on by Microprocessor pin 38. July 2010 LCD TV 47LE8500...

  • Page 85: Front (Ir, Intelligent Sensor And Moving Led) Section

    IR (Infrared Remote Sensor) and the Intelligent Sensor. This board also connects with the Soft Touch Key Board and the Center LG Logo board. The Center LG Logo lights after power on and the picture appears. Then dims down in about 2 seconds. At power off, it does the reverse.
  • Page 86 Front IR Board (Connections Identified) Front IR Board (Connections Identified) p/n EBR64966401 To Soft Touch CON3 CON2 Key Board To Center Logo Board CON1 P100 To Main Board IR board and Intelligent Sensor board July 2010 LCD TV 47LE8500...
  • Page 87 3.45V 3.36V Open LED_LOGO Open 3.45V 3.36V Open 1.57V 1.54V Open CON3 "Front IR" to “LG Logo Board" +3.3V_Normal 3.3V Open STBY Diode Check LED_R/BUZZ Open 3.45V Clock pulses only present when Intelligent Sensor is turned on. (3.7V p/p) 1.36V 0.6V...
  • Page 88 INVISIBLE SPEAKER SECTION INVISIBLE SPEAKER SECTION Speaker p/n EAB60961501 The 47LE8500 contains the Invisible Speaker system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports. Installed Top View Side View Front View...

  • Page 89: Interconnect Diagram (11 X 17 Foldout Section)

    This Power Point shows a graphical representation of the 11 X 17 This Power Point shows a graphical representation of the 11 X 17 foldout page so clarity is limited. foldout page so clarity is limited. July 2010 LCD TV 47LE8500...
  • Page 90 47LE8500 INTERCONNECT DIAGRAM Note: If a particular block is exhibiting a dimmer level Each connector (27 total) to the LED Blocks (216) Drive Signals INVERTER (SECONDARY) V73~V80 P204 "SMPS" To CN1 "INVERTER Main" P205 "SMPS" To CN201 "INVERTER Secondary" V25~V32...
  • Page 91 42LE8500 Inverter Main and Secondary Local Dimming Control Signals Waveforms 42LE8500 Inverter Main and Secondary Local Dimming Control Signals Waveforms CN11 INVERTER (MAIN) FROM P7900 MAIN BOARD Inverter Main CN11 pin 01 Inverter Main CN11 pin 02 Inverter Main CN11 pin 02 Inverter Main CN11 pin 03 Inverter Main CN11 pin 03 Black or White Screen...
  • Page 92 47LE8500 MAIN (FRONT SIDE) SIMICONDUCTORS IC700 (+1.26V_TU) IC8002 (D1.8V) IC8005 (+3.3V_NORMAL) IC8902 (+1.26V_MEMC) IC9102 DC to DC Q8003 PANEL_VCC Q8800 AMP_MUTE Regulator Regulator Regulator Regulator HVDD T-CON Pin 25 IC8801 Control 2nd Driver [1] 0V (Gnd) [1] 5V [1] 0V (Gnd)
  • Page 93 47LE8500 47LE8500 Conclusion Conclusion Direct View LCD Direct View LCD Page Page This concludes the 47LE8500 training session.

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