LG 55LW5600 Troubleshooting Manual
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LG 55LW5600 Troubleshooting Manual

1080p direct view lcd.led backlights. lcd-dv 55" class 1080p 120hz led tv smarttv (54.6" diagonally)
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See also: Owner's Manual , Manual Del Usuario
1080P
Direct View LCD
55LW56000
55LW56000
55LW56000
55LW56000
Training
LED Backlights
LCD-DV Troubleshooting
55" Class 1080P 120Hz LED
TV SmartTV (54.6" diagonally)
Published July 30
th
, 201 1

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  • Page 1 1080P Direct View LCD 55LW56000 55LW56000 55LW56000 55LW56000 Training LED Backlights LCD-DV Troubleshooting 55" Class 1080P 120Hz LED TV SmartTV (54.6" diagonally) Published July 30 , 201 1...
  • Page 2 OUTLINE Preliminary Section: Contact Information, Preliminary Matters, LCD Overview, General Troubleshooting Steps Product Information Section: Specifications Menu Information Product Information Section: Specifications, Menu Information Cinema 3D Section: Screen design and theory Disassembly Section: Removal of Circuit Boards Disassembly Section: Removal of Circuit Boards Troubleshooting Section: Board Operation Troubleshooting of : •...
  • Page 3 Overview of Topics to be Discussed 55LW56000 LCD Direct View Display 55LW56000 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 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 July lead to property damage or user injury If wires screws clips straps nuts or washers used to complete a ground path are removed for user injury.

  • Page 5: Regulatory Information

    ESD Notice (Electrostatic Static Discharge) 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.
  • Page 6 Plasma Control Board ROM Update (Jig required) t l B d ROM U d t (Ji i d) Published July 2011 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 Safety and Handling Regulations 1. Approximately 20 minute pre-run time is required before making any picture performance adjustments from the Menu. 2. Refer to the Voltage/Current silk screening on the Switch Mode Power Supply. 3. C-MOS circuits are sensitive to static electricity. 3.

  • Page 8: 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 and give off a distinct odor.
  • Page 9 IS IT A TV? OR SOMETHING BETTER? Welcome to the third dimension! The LW5600 delivers LG Cinema 3D technology and a whole lot more. It lets you tap into the virtually limitless entertainment capabilities of LG Smart TV and enjoy better picture quality with LG's LED Plus display technology picture quality with LG's LED Plus display technology.
  • Page 10 Wireless Media Box 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: HDMI Cable from the Dongle to the TV to transfer Audio and Video Signals. Wired Remote cable between the TV and Dongle for Control Functions.
  • Page 11 Wireless Network Adaptor (AN-WF100) Wireless Network Adaptor Sold Separately Using the LG Wireless LAN for Broadband Adaptor, which is sold separately, allows the TV to connect to a wireless LAN network. The Wireless Network adaptor attaches to the Television via either of the two USB connections:...
  • Page 12 Internet connection & subscriptions required and sold separately. The Magic Motion Remote does not come • LG Cinema 3D equipped with all LG Smart TV enabled TVs and a separate purchase maybe required. The Hulu Plus • 2D to 3D Conversion service is projected to be available via a firmware update in July 2011.
  • Page 13 Want 3D like you get it in the movie theater? Lightweight glasses, Want 3D like you get it in the movie theater? Lightweight glasses, wider viewing angles and with clear 3D images? LG's Cinema 3D experience can bring it right to your home. Enjoy amazing depth along with smoother, crisper images, and a clear picture from virtually any angle.
  • Page 14 WiFi Ready: WiFi Ready: Getting your LG TV connected to NetCast™ Entertainment Access and other online content is easy when you are WiFi™ Ready. If you have existing wireless broadband, setting it up is simple and you don't need to worry about messy wires.
  • Page 15 See sports, video games and high-speed action with virtually no motion blur and in crystal clarity with LG’s TruMotion 120Hz technology Now your TV and in crystal clarity with LG s TruMotion 120Hz technology. Now your TV can keep up with the fastest moving scenes.
  • Page 16 55LW56000 Remote Control p/n AKB72914041 BOTTOM PORTION TOP PORTION Parts List and Owner’s Manual list a p/n AKB72914043. It has the same buttons, but some may be in different locations. July 201 1 LCD TV 55LW56000...
  • Page 17 TV Rear Input / Output Jacks USB1 or USB2 for Software Upgrades, Music, Videos and Photos. Rear In/Out Jacks Rear In/Out Jacks Also for the Wireless Network adaptor. Sid I /O t Side In/Out USB 2 USB 1 Wireless Media Box Remote Jack HDMI 4 HDMI 4...
  • Page 18 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 Bring up the Customer’s Menu then Scroll down to cursor down 2 times, (Input) will be highlight the highlighted.
  • Page 19 1) Download the Software File. Jump Drive Directory Software File LG_DTV Sub-Directory 2) Copy new software (xxx epk) to "LG DTV" 2) Copy new software (xxx.epk) to LG_DTV Currently Installed Version Currently Installed Version folder. Make sure to have correct software file.
  • Page 20 Manual Software Download: Prepare the Jump Drive as described in the “USB Automatic Download” section and insert it into either of the USB ports. Bring up the Customer’s Menu then cursor down 2 times, (Input) will be highlighted. Cursor right to highlight (SETUP). Press “ENTER”...
  • Page 21 Product and Service Info. Menu 2) Scroll down to 1) Bring up the Customer’s Menu then cursor down 2 times, (Input) will be cursor down 2 times, (Input) will be highlight the highlight the highlighted. Cursor right to highlight “?” mark (SUPPORT).
  • Page 22 Accessing the Host Diagnostic Screen (Page 1 of 2) Use the Host Diagnostic screen to investigate the signal quality of a problem channel. 4) Scroll down and highlight “Options”. 1) Place Television on the digital channel that July be showing problems. 2) Bring up the Customer’s Menu.
  • Page 23 Channel Blocked or Current Channel (Main) Host Information Selected Not Blocked Model Name : 55LW5600-UA (Liquid Crystal Display) Channel Info : Digital 19-1 Memory Parental Control : Channel is not blocked FLASH : 524288 KB DVI/HDMI Status DRAM : 524288 KB Can’t display this information now...
  • Page 24 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.
  • Page 25 55LW5600 Service Menu First Page Bring up the Service Menu using the Service Remote And pressing “In-Start” enter password 0413. IN START Model and S/N Adjust Check Country Group Model Name: 55LW5600-UA 1. Adjust Check 1. Country Group (Press OK to Save) Serial Number: 011PTCA8Y075 2.
  • Page 26 55LW5600 Model Number Download Screen Bring up the Service Menu using the Service Remote. When the Main Board is replaced, the Model Number and Scroll down to item 6. Model Number D/L to highlight. Serial Number must be corrected. Follow these instructions Press “Cursor Right”...
  • Page 27 55LW5600 UTT Reset (IN START) Screen IN START SYSTEM 1 Model Name: 55LW5600-UA 1. Adjust Check 0. Baudrate 9600 Serial Number: 011PTCA8Y075 2. ADC Data 1. 2 Hours Off (On Timer) : 02.02.07.01 3. Power Off Status S/W Version: 2. 2 Hours Off (Screen Mute) : 2.21.2...
  • Page 28 55LW5600 EDID Download Screens EZ ADJUST When Item 11 was selected 0. Tool Option1 PCM EDID D/L 1. Tool Option2 2. Tool Option3 HDMI1 OK/(PCM) If Item 5 on Adjust Check in the 1 3. Tool Option4 HDMI2 OK/(PCM) page of the Service Menu shows 4.
  • Page 29 15-3/4" 30-7/8" Center 400mm 784.86mm 33-1/2" 850.9mm 15-7/16" 392.11m 7-7/8" Remove 4 screws to 200m remove stand for wall mount 2-5/8" (66.68mm) 21-3/4" 13" 552mm 330.2mm Weight w/o Stand 48.5 lbs Weight with Stand 47.8 lbs July 2011 55LW5600 LCD-DV...
  • Page 30 PASSIVE 3D SECTION PASSIVE 3D This section of the manual will discuss the Passive 3D used in the 55LW56000 LCD Direct View Television. Upon completion of this section the Technician will have a better Upon completion of this section the Technician will have a better understanding of Passive 3D.
  • Page 31 Advantages of Passive 3D GLASSES ADVANTAGES Easy Wear Light Weight : 15g AG-P110 • Comfortable • Possible to watch 3D while laying down • Flicker Free • Horizontal (Left/Right) Viewing Angle Free • Light • Large group of people can watch 4 Pair Come with the TV •...
  • Page 32 PR Type of 3D Display Pattern Retarder makes separation of polarization status. Each eye can see left and right images respectively when wearing polarized glasses Each eye can see left and right images respectively when wearing polarized glasses. Ri ht i Right images input to odd lines dd li Left images input to even lines...
  • Page 33 FPR 3D Display Design Polarization film (PR) is placed on the front of the LCD panel Cell Polarizer Pattern Right-handed Circularly Retarder polarization Left handed Circularly Left-handed Circularly polarization Polarized glasses Right Eye Left Eye 1. Patterned Retarder plate is attached on the LCD module 2.
  • Page 34 Polarizer State Pattern retarder makes 2 kinds of polarization states; LHC, RHC Polarizer glasses is possible to distinguish polarization state Polarizer glasses is possible to distinguish polarization state. Polarization State #4 Polarization State #4 (Linear) Distinguish polarization state - LHC : Left Handed Circularly Polarizer Polarization - RHC : Right Handed Circularly...
  • Page 35 LCD 3D Formatter 3D Formatter - All Formats of input are available and converted by 3D technology - Full HD input available - 3D Enhancement Input Capabilities Output Capabilities HDMI 1.3 / HDMI 1.4 Regular 2D 3D to 2D 3D Formatter 3D Formats (Frame Packed) 3D Formats (Frame Packed) LCD: Interlaced (Passive) Horizontal...
  • Page 36 LG 3D TV 3D broadcasting LG 3D TV 3D broadcasting Online 3D for All types of broadcasting signals Broadcasting Broadcasting Video Input of broadcasting signal Press “3D” button for mode change Select type of input source, Press “ENTER”. In case 3D looks *abnormal, press “3D Settings”...
  • Page 37 3D Settings Menu 3D Settings Menu 3D settings may help with 3D view pleasure. In case 3D looks *abnormal press “3D Settings” In case 3D looks abnormal, press 3D Settings in the “Quick MENU”. 3D Picture Size: Cuts off the outer edges of the picture and stretch it to fit the full screen in 3D mode.
  • Page 38 DISASSEMBLY SECTION Disassembly: This section of the manual will discuss Disassembly Layout This section of the manual will discuss Disassembly, Layout (Circuit Board Identification) of the 55LW56000 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 39 Panel Structure and Local Dimming Backlight Structure LED Arra is on the side of Mod le LED Array is on the side of Module Upper Array M t l Metal Cover 8 Blocks 8 Blocks Each of the 16 blocks can be controlled h f th 16 bl t ll d independently (Local Dimming) or all of...
  • Page 40 Removing the Back Cover Remove the 32 screws indicated. Pay attention to the size and type of screw Pay attention to the size and type of screw as there are many different types. Putting in an improper screw when reassembling July Cause damage. The AC Cord unplugs under cover.
  • Page 41 Circuit Board Layout Warning: The Frame may Warning: The Frame may To LEDs have sharp edges Power Supply (SMPS) Main Board LVDS Cables LVDS Cables T-CON Panel Connection Points IR / Soft Touch Invisible Invisible Motion Key Board Key Board Speaker Right Speaker Right Speaker Left...
  • Page 42 55LW5600 Connector Identification Diagram To LEDs p/n: EBR72717002 (AUSYLHR) TFT PANEL p/n: EBR73145701 (AUSYLJR) p/n: EBR72717004 (AUSYLUR) p/n: EAJ61750001 (All Models) p/n: EBT61398007 (AUSYLUR) p/n: EAJ61928201 (AUSYLJR/UR) P203 P202 Black White Plug Plug If the Panel is replaced, P3503 POWER...
  • Page 43 Power Supply p/n EAY62169901 Board Removal Disconnect P201, P202, P701 n/c P203, P832 and AC In Press in SK100. gently on the two the two P201 tabs to release lock Remove the 6 AC In screws indicated by the arrows by the arrows.
  • Page 44 Removing the Main Board The Decorative Metal Plate is one Piece P5201 P101 P101 P502 P102 Disconnect P3503, P502, P3503 P1702, P1502, P1501, P901 and P1302. P1702 Screw removed Press in on the with Back Press in side release Remove any tape holding P1502 on the tabs to remove.
  • Page 45 Removing the T-CON (1 of 2) Comes with the Panel T-CON is under the Stand Bracket. T-CON is under a Shield. Remove the Stand Bracket (4 Screws). Remove the T-CON Shield (3 Screws). Press in on the Press in on the two side unlocking tabs.
  • Page 46 T-CON Board Removal Continued (2 of 2) BROKEN TAB: To remove the LVDS cables CN1 and CN2; If a tab is broken, Press in on the two tabs and slowly rock the Use a thin object Use a thin object cable out of the connector.
  • Page 47 Removing the Front IR Page 1 of 2 IR/Key board p/n: EBR72671301 The Front IR Item 510 on the parts breakdown is Remove the Speaker by sliding it forward. under a wire routing bracket Item 511. Disconnect the cable coming from the Main board and remove it from the wire holders in Item 511.
  • Page 48 Removing the Front IR Continued p/n: EBR72671301 Front IR/Key Board Exposed After gaining access to the Front IR/Intelligent Sensor Board, lay the TV down on its face and remove the LCD Panel by releasing the tabs around the perimeter of the panel. Lift the Panel up and out. The Front IR / Key Board is attached to the Front Frame Item 300 p/n: ABJ73289206.
  • Page 49 TROUBLESHOOTING SECTION Troubleshooting: g This section of the manual will discuss troubleshooting. Upon completion of this section the Technician will have Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems. July 201 1 LCD TV 55LW56000...
  • Page 50 POWER SUPPLY SECTION This switch mode power supply develops Stand By 3.5V at all times when AC is applied. At power on, it develops 12V and 24V for the Main board. It d It develops 63V for the LED Backlights. 63V f th LED B kli ht...
  • Page 51 55LW5600 Power Supply Drawing P201 Connector "SMPS Board" To P502 "MAIN Board" P202 P203 Label STBY Diode Check ERROR 2.2V BD101 C257 C256 L601 D253 0.2V~3.3V Cold (Chassis) VC_3B VC_2C 12.07V 0.48V Gnd side VC_3A Q251 VC_2D P701 12.07V 0.48V DRV-ON 3.24V...
  • Page 52 55LW5600 Power Supply Start Up Sequence (6) 63V is 56V w/PWR_ON (8) 63V w/DRV_ON Primary side fuses: POWER SUPPLY (SMPS) POWER SUPPLY (SMPS) AC In P202 BACKLIGHTS F101 Stand-By 57V Run 396.5V (Hot Gnd) F501 Stand-By 154V Run 398.5V (Hot Gnd)
  • Page 53 55LW5600 Television Turn On Commands Circuit Drawing +12V Q507 R555 22KΩ R558 10KΩ L511 To DC to DC Conv R553 Panel_Vcc (12V) Q506 Q505 T-CON R559 1.8K 1.8V 0.68V L507 L509 +12V +3.3V_Normal Panel_CTL SMPS MAIN IC505 3.47V Power 3.35V...
  • Page 54 Power Supply Board Low Voltage Test 1 AC Should not be applied at any time while adding jumpers or P201 SMPS TEST 1 While unplugging connectors as damage to the circuit Board While unplugging connectors as damage to the circuit Board Front pins on Front pins on 23 24...
  • Page 55 Power Supply Board Backlights Test 2 Continue if the 1 test was OK. P201 SMPS TEST 2 Leave original jumper in place. Leave original jumper in place. Front pins on 23 24 Connector are Odd number (3) Add another jumper between (STBY_3.5V) 21 22 pin 9, 10, 11 or 12 and Pin 18 (DRV_ON).
  • Page 56 55LW5600 2 Sided Edge Lit Panel (V6) 2011 55" TWO SIDED EDGE 2011 (Rear View) LEDs Block: VC-2D (EL69 Rivet) P203 pin 11 Block: VC-3A (EL70 Rivet) P202 pin 3 Block: VC-2C (EL68 Rivet) P203 pin 10 Block: VC-3B (EL71 Rivet) P202 pin 4...
  • Page 57 63V Power Supply for the Backlights Section of the SMPS C256 C257 The Power Supply for the Backlights pp y can be checked at the (+) side of C256 or C257 or the Cathode of D253. Note: When the PWR ON command Note: When the PWR_ON command Arrives, this voltage will read 56V.
  • Page 58 P202 and P203 Backlight Driver Section of the SMPS Association with TPs Tip: You can use the right side of R287 or R288 to check for the 63V. Tip: Remember to use a 220Ω to ground on any of the “EL” Test Points to force an LED Block to turn on. P203 P202 P203...
  • Page 59 P202 / P203 Power Supply Connector Voltage and Diode Check P202 White Plug "SMPS Board" To "Panel LEDs" P203 Black Plug "SMPS Board" To "Panel LEDs" Label Diode Check Label Diode Check LED+ C256+ LED+ C256+ VC-1A EL62 *1.59V~18V VC-3A EL70 *1.59V~18V VC-1B...
  • Page 60 P832 Local Dimming Drive Waveforms Top Waveforms are 500uSec/div P832 "SMPS" to P1601 "MAIN" Bottom Waveforms are 100uSec/div Label Label VSYNC L/DIM0_SCLK P832 Pin 3 SCL 3.2V p/p P832 Pin 2 SDA 3.3V p/p Reverse 2mSec/div 2mSec/div P832 Pin 4 SIN 3.35V p/p P832 Pin 6 SCLK 3.3V p/p P832 Pin 1 VSYNC 3.5V p/p...
  • Page 61 P832 Voltages and Diode Checks P832 "SMPS" to P3503 "MAIN Board" P832 Connector Label STBY Diode Check Reverse 1.91V SCLK 0.1V 3 2V 3.2V 3.2V Pin numbers are inverted on the Main Board VSYNC Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW56000...
  • Page 62 P201 Power Supply Connector Voltage and Diode Check P201 Connector "SMPS Board" To P502 "MAIN Board" P201 Connector Label STBY Diode Check ERROR 2.2V 0.2V~3.3V 12.07V 0.48V Odd pins 12.07V 0.48V are on top DRV-ON 3.24V 12.07V 0.48V V-SYNC 13~15 9~12 3.5V 3.56V...
  • Page 63 SK100 and AC Fuse Power Supply Voltage and Diode Check SK100 "SMPS" to AC IN Label STBY Diode Check 120Vac F100 5A/250V AC Voltage Readings (From Hot Ground) AC Voltage Readings (From Hot Ground) AC IN Pins 1 and 2 for STBY and RUN. F100 Diode Mode values taken with all Connectors Removed F100 (Diode Check)
  • Page 64 F101 and F501 Power Supply Voltage Checks F101 3.15A/250V From Hot Gnd STBY 57V Run 396 5V Run 396.5V F501 1A/250V From Hot Gnd STBY 154V Run 398.5V If the set was on and then turned off, the voltage takes a while to bleed down. July 201 1 LCD TV 55LW56000...
  • Page 65 MAIN BOARD SECTION The Main board receives its operational B+ from the Power Supply via P502. There are two LVDS cable feeds that are output to the T-CON (TFT Driver). These carry the duel 24 bit LVDS Video and TruMotion Video equaling a 120Hz video signal. These signals have already been prepared for the T-CON board.

  • Page 66: Main Board Layout

    Main Board Layout p/n: EBR72717002 AUSYLHR p/n: EBR73145701 AUSYLJR P3503 p/n: EBR72717004 AUSYLUR To SMPS P502 p/n: EBT61398007 AUSYLUR P5201 P101 To SMPS VIDEO P102 PROCESSOR IC1702 P1702 IC101 Is under a Audio To Speakers Heat Sink. It runs Hot It runs Hot.
  • Page 67 55LW5600 Main Board (Front and Back Side) Component Layout P502 "MAIN Board" Connector To P201 "SMPS Board" Debug SW5201 Label STBY Diode Check P502 P3503 RL_ON Drivers Debug PWR-ON 3.4V 2.79V P101 Q504 P5201 Q502 Q501 IC502 Power Det (24V) P102 0.9V_Core SW...
  • Page 68 55LW5600 Main Board (Front) Component Layout Debug SW5201 P3503 Debug RL_ON Drivers P101 P5201 Q502 Q501 P102 P502 0.9V_Core SW 3.3V_ 5V_Normal L505 L1704 Q503 Normal IC507 IC501 IC505 L1703 Audio Amp 0.9V_CORE Q508 IC1702 12.43V IC506 0.9V_Core SW Each Pin L1708 1.5V_FRC...
  • Page 69 55LW5600 Main (Front Side) Component Voltages IC103 NVRAM IC506 Switched IC801 IC803 RS232 IC2103 (+1.26V_TU) Q501 RL_ON (PWR_On) for USB 5V for USB 2 Data Buffer Routing Regulator 1st Driver [1] n/c [1] 0V (Gnd) [1] 1.81V [1] 3.5V [1] 0V (Gnd) B 0.64V...
  • Page 70 10. NC IR Pass 9. SIF Audio D710 TU_CVSB 8. NC Q2105 7. SDA Tuner Data 6. SCL Q2104 Tuner Clock 5. NC TU_SIF D707 4. NC 3. 5V Tuner B+ D810 2. NC 1. NC July 2011 LCD-DV 55LW5600...
  • Page 71 55LW5600 Main (Back Side) Component Voltages IC502 Power Det Gen Q101 RGB_DDC_SDA Q710 CEC Remote Q2106 Tuner Video D711 5V Pull-Up to (For +12V) FET Buffer HDMI CEC (Analog) Buffer DDC_SCL/SDA_4 [1] 0V (Gnd) [B] 0V (Gnd) [B] 3.47V B 3.67V A1 4.96V...
  • Page 72 Main Board X601, X602 and X5201 Crystal Checks X602 X5201 Either leg Either leg 1 71V 1.71V 1 71V 1.71V 32.768KHz No Signal 1.18V 3V p/p 2.28V p/p Runs all The time 24Mhz 3.51V p/p 2.09V Runs when set is on Bottom leg X601 IC601 Micro Crystal...
  • Page 73 Audio Amplification for Speakers Information Use speaker out to test for defective Audio Amp IC1702 Note: (Normal ½ Audio B+) 12 43V on each pin Note: (Normal, ½ Audio B+) 12.43V on each pin. IC1702 VOLTAGES 3.3V_AU_AVDD pin 13 3.3V_DVDD pin 27 All made from 3.3V Normal Right Channel:...
  • Page 74 P1702 Main Board Connector to Speakers Voltage and Diode Check P1702 Connector "Main" To "Speakers" P1702 Connector Main To Speakers P1702 P1702 Label Diode Check SPK-R(-) 12.43V Open SPK R( ) SPK-R(+) 12 43V 12.43V Open SPK-L(-) 12.43V Open SPK-L(+) 12.43V Open Diode Mode values taken with all Connectors Removed...
  • Page 75 P502 Main Board Connector to Power Supply Voltage and Diode Check P502 "MAIN Board" Connector To P201 "SMPS Board" P502 Label STBY Diode Check PWR-ON 3.4V 2.79V 9 12 9-12 3 5V ST 3.5V_ST 3 56V 3.56V 3 51V 3.51V 1 15V 1.15V 13-15...
  • Page 76 P3501 “Main” to “T-CON” Voltage and Diode Check P3501 "MAIN Board" To "T-CON" CN1 Label Diode Check Label Diode Check Label Diode Check 2D/3D_CTL 1.17V TXB4P 1.16V 1.13V TXA3N 1.24V 1.12V TXA3P 1.18V 1.12V TXA4N 1.23V 1.12V TXA4P 1.16V 1.12V AU0_65_Mirror LVDS_SEL BIT_SEL...
  • Page 77 P3502 “Main” to “T-CON” Voltage and Diode Check P3502 "MAIN" To "T-CON" CN2 Label Diode Check Label Diode Check P3502 P3502 TXC3P 1.18V 1.12V TXC4N 1.23V 1.12V TXC4P 1.16V 1.12V TXD0N 1.24V 1.11V TXD0P 1.18V 1.12V TXD1N 1.23V 1.12V TXD1P 1.16V 1.13V TXC0N...
  • Page 78 P901 Main Board to (Ft. IR/Intelligent Sensor) Voltage and Diode Check P901 Connector "MAIN Board" To "IR Board" J1 Label STBY Diode Check P901 P901 3.55V 3.48V 3.29V 3.55V 3.48V 3.29V KEY 1 3.31V 3.31V 1.84V KEY 2 3.31V 3.31V 1.84V 3.5V_ST 3.55V...
  • Page 79 P1302 “Main” to “Motion Remote” (Voltage and Diode Check) P1302 P1302 "MAIN Board" To "Motion Remote" P1302 MAIN Board To Motion Remote Label Diode Check 3.5V_Normal 3.41V 0.56V M_Remote_RX 3.30V M_Remote_TX 3.31V Reset 3 32V 3.32V 2 41V 2.41V DC_MRemote 3.31V 2.42V DD_MRemote...
  • Page 80 JK1001 Main Wireless Media Box Dongle Jack (Voltage and Diode Check) JK1001 "MAIN Board" To "Wireless Media Box Dongle" Wireless Media Box Dongle Wireless Media Box Dongle Label Label STBY STBY Diode Check Diode Check must be plugged in for *25V these voltages.
  • Page 81 T-CON (TFT DRIVE) SECTION TFT-LCD Controller Board The T-CON is located at the bottom of the panel under the Stand Bracket. 12V is supplied to the T-CON Board from the Main Board via connector CN1 (easily measured at fuse F1). IC UC1 receives 24 bit LVDS video signals from the Main Board at CN1 and CN2 which it processes into TFT Drive Signals.
  • Page 82 T-CON (TFT Drive) Board Layout TIP: The two screws shown in the picture are for the Service Position. They would have been removed when removing the shield. Be sure to reinstall them if servicing the T-CON board. t ll th th T CON b July 201 1 LCD TV 55LW56000...
  • Page 83 55LW5600 T-CON (TFT Drive) with (Shield Removed) Components Identified Warning: T-Con Board under shield. Be sure to reinsert screws before operating set with shield removed. PANEL TEST TO MAIN To run the T-CON “Panel Test”, remove LVDS LVDS the LVDS cables. Jump 12V to the 12V fuse.
  • Page 84 T-CON (TFT Drive) Board Panel Test Set up the Power Supply Test as in Test 2 (Shown on page 46). Do not apply AC at this time. Jump 12V from the SMPS to the T CON Fuse F1 (P201 pin 17 or 19 or 21) Jump 12V from the SMPS to the T-CON Fuse F1 (P201 pin 17 or 19 or 21) Disconnect both LVDS Cables...
  • Page 85 CN1 T-CON Connector CN1 to the Main PWB (Voltage and Diode Check) CN1 "T-CON" to "MAIN Board" P3501 Label Diode Check Label Diode Check Label Diode Check TXB4P 1.08V 1.94V *3D_SYNC TXA3N 1.29V 1.94V TXA3P 1.12V 1.94V SDA2_3.3V 3.3V TXA4N 1.33V 1.94V SCL2 3 3V...
  • Page 86 CN2 T-CON to the Main PWB (Voltage and Diode Check) CN2 "T-CON" to "MAIN" P1503 Label Diode Check Label Diode Check TXC4N 1.28V 1.94V TXC4P 1.11V 1.94V TXD0N TXD0N 1 23V 1.23V 1 94V 1.94V TXD0P 1.18V 1.94V TXD1N 1.23V 1.94V TXD1P 1.18V...
  • Page 87 FRONT (IR, INTELLIGENT SENSOR and POWER LED) SECTION The Intelligent Sensor and IR board (located on the bottom left as viewed from the rear) contains the IR (Infrared Remote Sensor) and the Intelligent Sensor. This board also has the Soft Touch Key Board. The IR board receives it operating B+ pin 6 from the Main P901 (STBY 3.5V).
  • Page 88 Gaining access to the Front IR/Key Board IR/Key board p/n: EBR72671301 The Front IR Item 510 on the parts breakdown is Remove the Speaker by sliding it forward. under a wire routing bracket Item 511. Disconnect the cable coming from the Main board and remove it from the wire holders in Item 511.
  • Page 89 Front IR Component Identification See Disassembly section for gaining access to the IR/Key Board Front IR/Key t IR/K Attached to the Front Frame IR/Key Board p/n: EBR72671301 Board Exposed Board Decoder Output: 1.48V Ground Input Voltage 3.55V Infrared Receiver Power LEDs July 201 1 LCD TV 55LW56000...
  • Page 90 J1 Front IR/Soft Touch Key Board Voltage and Diode Check J1 "IR Board" To P901 "Main Board" L b l Label STBY STBY Di d Ch Diode Check 3.55V 3.49V 3.55V 3.49V KEY 1 3.33V 3.33V KEY 2 3.33V 3.33V 3.5V_ST 3.55V 3.49V...
  • Page 91 Soft Touch Key Resistance and Voltages Key 2 Line KEY 1 KEY 1 Pin 4 measured from Gnd Pin 4 measured from Gnd KEY 1 KEY 1 Pin 4 measured from Gnd Pin 4 measured from Gnd Volume (+) 16.8M Ohms Volume (+) 1.67V Volume (-)
  • Page 92 MOTION REMOTE BOARD SECTION The first time the Motion Remote has it’s batteries installed and pointed at the Television, the Motion Remote is s nchroni ed ith the TV After that synchronized with the TV. After that, when pointing the hen pointing the remote at the TV and pressing the Enter key, a pointer appears on screen, then by moving the Motion Remote...
  • Page 93 Motion Remote Receiver Board Voltage and Diode Check Motion Remote Board p/n EBR72499601 To Main Board "Motion Remote Receiver Board" To P1302 "Main" Label Label STBY STBY Diode Check Diode Check 3.5V_Normal 0.35V 3.33V 0.53V M_Remote_RX 0.35V 3.33V M_Remote_TX 0 35V 0.35V 3 33V 3.33V...
  • Page 94 INVISIBLE SPEAKER SECTION The 55LW56000 contains the Invisible Speaker system. The 55LW56000 contains the Invisible Speaker system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports. Back View Front View Speaker p/n EAB62088401 July 201 1 LCD TV 55LW56000...
  • Page 95 INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION) This section shows the 1 1X17 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 1 1 X 17 foldout page so clarity is limited foldout page so clarity is limited.
  • Page 96 55LW5600 INTERCONNECT DIAGRAM P201 "SMPS Board" To P502 "MAIN Board" P1302 "MAIN Board" To "Motion Remote" Note: If a particular area is exhibiting a dimmer backlight level than other areas or P832 "SMPS" to P3503 "MAIN Board" PWM Pin 22 can vary according to...
  • Page 97 55LW5600 MAIN (FRONT SIDE) SIMICONDUCTORS IC103 NVRAM IC505 (+3.3V_NORMAL) IC508 (+1.5V_DDR) IC802 EDID Data IC1203 EDID Data IC5401 (+1.26V_FRC) Q503 0.9V FET Q1001 Wireless Vcc for USB Regulator Regulator Regulator Switch Driver [1] n/c [1] 0V (Gnd) [1] 3.46V [1] 0V (Gnd)
  • Page 98 55LW56000 Conclusion Page Direct View LCD Direct View LCD Update Notifications In the future, if there are any Updates, they will appear here. This concludes the 55LW56000 l d th 55LW56000 training session.

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