LG 55LW5700 Training Manual
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LG 55LW5700 Training Manual

LG 55LW5700 Training Manual

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1080P
Direct View LCD
Training
55LW5700
55LW5700
55LW5700
55LW5700
LED Backlights
LCD-DV Troubleshooting
55" Class 1080P 120Hz LED
TV SmartTV (54.6" diagonally)
Published July 21
P bli h d J l 21
st
Updated July 28
th
See last page for updates
t
, 201 1
201 1
, 201 1

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  • Page 1 1080P Direct View LCD 55LW5700 55LW5700 55LW5700 55LW5700 Training LED Backlights LCD-DV Troubleshooting 55" Class 1080P 120Hz LED TV SmartTV (54.6" diagonally) P bli h d J l 21 Published July 21 , 201 1 201 1 Updated July 28...
  • Page 2 • Switch Mode Power Supply with LED Backlight Driver • Main Board • T CON (TFT Panel Driver Board) • T-CON (TFT Panel Driver Board) • Front IR/Intelligent/Soft Touch Key Board • Speaker • Speaker July 201 1 LCD TV 55LW5700...

  • Page 3: Overview Of Topics To Be Discussed

    Overview of Topics to be Discussed 55LW5700 LCD Direct View Display 55LW5700 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 If wires screws clips straps nuts or washers used to complete a ground path are removed for 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 201 1 LCD TV 55LW5700...

  • Page 6: Lg Contact Information

    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

    2. Check the model label. Verify model names and board model matches. 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 201 1 LCD TV 55LW5700...

  • Page 8: Basic Troubleshooting Steps

    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 perform a Safety AC Leakage Test before returning the product back to the Customer. July 201 1 LCD TV 55LW5700...
  • 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: Basic Specifications

    Internet connection & subscriptions required and sold separately. The Magic Motion Remote does not come • 2D to 3D Conversion equipped with all LG Smart TV enabled TVs and a separate purchase maybe required. The Hulu Plus • LED Backlighting service is projected to be available via a firmware •...
  • Page 11 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 12 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 13 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 14 55LW5700 Remote Control p/n AKB72914041 BOTTOM PORTION TOP PORTION Parts List and Owner’s Manual list a p/n AKB72915238. It has the same buttons, but some may be in different locations. July 201 1 LCD TV 55LW5700...
  • Page 15 Sid I /O t Side In/Out USB 2 USB 1 Wireless Media Box Remote Jack HDMI 4 HDMI 4 AV/Component HDMI 3 AV/Component AV/Component HDMI 2 RS232 Antenna HDMI 1 Optical Optical Head Head Audio Phones July 201 1 LCD TV 55LW5700...
  • Page 16 Cursor right to highlight “Software Update”, Press “ENTER” on Remote Remote Highlight “Check Update Version” to see if an update is available. Scroll up to highlight “ON” and cursor right to turn off automatic Software Update. July 201 1 LCD TV 55LW5700...
  • Page 17 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 18 “Forced” Download Menu. Any file can be begin the download process. downloaded when selected and may cause the Main downloaded when selected and may cause the Main board to become inoperative if the incorrect file was selected. July 201 1 LCD TV 55LW5700...

  • Page 19: Product And Service Info. Menu

    (SUPPORT). (SETUP). Press “ENTER” on the Remote. Cursor right and scroll down to highlight highlight “Product/Service Info”, Press “ENTER” on Remote 3) Information for Customer Support appears. Note: Model Number does not include suffix. July 201 1 LCD TV 55LW5700...
  • Page 20 “Setup”. Press “Enter” on the remote. 5) Press the (1) Key 5 times. The Host Diagnostics screen appears. The Host Diagnostics screen appears. 3) The “Setup” Menu appears. See next page for more details. July 201 1 LCD TV 55LW5700...
  • Page 21 Channel Blocked or Current Channel (Main) Host Information Selected Not Blocked Model Name : 55LW5700-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 22: Accessing The Service Menu

    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 201 1 LCD TV 55LW5700...
  • Page 23 55LW5700 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: 55LW5700-UA 1. Adjust Check 1. Country Group (Press OK to Save) Serial Number: 012RMKU9B909 2.
  • Page 24 55LW5700 Power Off Status (IN START) Screen IN START Power Off Status 1. Adjust Check Model Name: 55LW5700-UA 0. POWER_OFF_BY_LOCAL_KEY 2. ADC Data Serial Number: 012RMKU9B909 1. POWER_OFF_BY_ACDET Select Item 3 : 03.11.04.01 S/W Version: 3. Power Off Status 2. POWER_OFF_BY_REMOTE_KEY1 : 3.21.8...
  • Page 25 POWER_OFF_BY_LOCAL_KEY Power off by local key POWER_OFF_BY_CPU_ABNOR Power off by CPU Abnormal status POWER_OFF_BY_INV_ERROR Power off by LCD module inverter error POWER_OFF_BY_OTA Power off by OTA update POWER_OFF_BY_UNKNOWN Power off by the other causes July 201 1 LCD TV 55LW5700...
  • Page 26 55LW5700 UTT Reset (IN START) Screen IN START SYSTEM 1 Model Name: 55LW5700-UA 1. Adjust Check 0. Baudrate 9600 Serial Number: 012RMKU9B909 2. ADC Data 1. 2 Hours Off (On Timer) : 03.11.04.01 3. Power Off Status S/W Version: 2. 2 Hours Off (Screen Mute) Select Item 4 : 3.21.8...
  • Page 27 55LW5700 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 28 55LW5700 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" 30-13/16" Center 400mm 782.32mm 33-3/8" 848.36mm 15-7/16" 392.11m 8-1/8" Remove 4 screws to 206.5mm remove stand for wall mount 2-5/8" (66.04mm) 21-3/4" 13-3/8" 553mm 340.36mm Weight w/o Stand 48.7 lbs Weight with Stand 57.8 lbs July 2011 55LW5700 LCD-DV...
  • Page 30 TV. Wired Remote to control the Media Box Wired Remote to control the Media Box Wi l Wireless Receiver/Transmitter “Dongle” TV A/V Inputs Attaches via Velcro to the back of the set HDMI HDMI July 201 1 LCD TV 55LW5700...

  • Page 31: Wireless Network Adaptor (An-Wf100)

    Wireless Network Adaptor (AN-WF100) Wireless Network Adaptor Included 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 32: Passive 3D Section

    PASSIVE 3D This section of the manual will discuss the Passive 3D used in the 55LW5700 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 33 July 201 1 LCD TV 55LW5700...
  • Page 34 July 201 1 LCD TV 55LW5700...

  • Page 35: Lcd 3D Formatter

    LCD panel and Polarized Glasses required 3) Checkerboard No Synchronization required 4) Frame Sequential between glasses and TV (Full Resolution available) HDMI 1.4 (Only) L / R represents; 5) Over/Under Left Camera View Right Camera View July 201 1 LCD TV 55LW5700...
  • Page 36 Side by Side Board Sequential See next page for more Note: Picture behind the menu is showing a side by side format. 3D Mode Setting details. Note: HDMI 1.4 will automatically select 3D type for you. July 201 1 LCD TV 55LW5700...

  • Page 37: Settings Menu

    3D mode. sides of the picture in 3D mode. 3D Picture Size: Cuts off the outer edges of the picture and stretch it to fit the full screen in 3D mode. July 201 1 LCD TV 55LW5700...

  • Page 38: Advantages Of Passive 3D

    Additional Glasses • No Charging • No synchronization pulse to interfere with. Reasonably priced • Compatibility with all types of 3D Passive TV Maker • Glasses can be made by polarized coating on normal glasses July 201 1 LCD TV 55LW5700...

  • Page 39: Pr Type Of 3D Display

    Each eye can see left and right images respectively when wearing polarized glasses. Distinguished by Polarized Glasses Ri ht i Right images input to odd lines dd li Left images input to even lines July 201 1 LCD TV 55LW5700...
  • Page 40 CCW 45 degree 3. Odd number pixels see through the Left lens and even number pixels see through the Right lens of the Polarized glasses 4. The brain combines separated images into 3D image July 201 1 LCD TV 55LW5700...
  • Page 41 Divides light output into 2 kinds of polarization states polarization states Pattern Retarder Pattern Retarder - LHC : Left Handed Circularly Polarization Polarization State #1 (Linear) - RHC : Right Handed Circularly Polarization Polarization Polarizer of LCD July 201 1 LCD TV 55LW5700...

  • Page 42: Supported Formats

    & Bottom to play in 3D. •Video, which is input as HDMI 3D Frame Packing, HDMI 3D Side by HDMI 3D Sid b Side, HDMI 3D Top & Bottom format, is switched into the 3D screen automatically July 201 1 LCD TV 55LW5700...

  • Page 43: Disassembly Section

    Disassembly: This section of the manual will discuss Disassembly, Layout (Circuit Board Identification) of the 55LW5700 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 the disassembly procedures, the layout of the printed circuit boards and be able to identify each board.
  • Page 44 Putting in an improper screw when reassembling may cause damage reassembling may cause damage. The AC Cord unplugs under cover. Remove plastic cover. The Stand has to be removed before removing the back. July 201 1 LCD TV 55LW5700...

  • Page 45: Circuit Board Layout

    Main Board Key Board Key Board LVDS Cables LVDS Cables T-CON Panel Connection Points IR / Intelligent Invisible Invisible Sensor Board Sensor Board Speaker Right Speaker Right Speaker Left Speaker Left July 201 1 LCD TV 55LW5700...
  • Page 46 55LW5700 Connector Identification Diagram To LEDs TFT PANEL If the Panel is replaced, p/n: EAJ61750001 (LC550EUF-SDF1) reset the UTTTime. Service p/n: EAJ61928201 (LC550EUF-SDF2) Menu, System 1 Item 12 P203 P202 Black White Plug Plug P3503 POWER P101 P701 n/c P502...

  • Page 47: Power Supply Board Removal

    Note: This screw AC In SK100 Is a different size Is a different size SK100 fits very snug into it’s connector. with washer. Press in on the two tabs to release lock July 201 1 LCD TV 55LW5700...

  • Page 48: Removing The Main Board

    Main board holding the Metal Remove the board. Then plate in place. Remove the wrap around decorative Metal piece decorative Metal piece. Note: It is one piece. p/n: EBT61410207 Screw Screw Decorative removed Metal Plate with Back July 201 1 LCD TV 55LW5700...

  • Page 49: Removing The T-Con (1 Of 2)

    See next page for removing Connectors. Disconnect CN1, CN2, CN4 and CN5. Return Screws if testing board. Return Screws if testing board. Flip up the unlocking tabs. Flip up the unlocking tabs. July 201 1 LCD TV 55LW5700...
  • Page 50 Pull Out Pull Out Press In Press In Press In (CN2) LVDS (CN1) LVDS Removing Ribbons To the Panel (Bottom of the board) Flip the locking tabs upward and pull out the ribbon cables. July 201 1 LCD TV 55LW5700...
  • Page 51 Removing the Front IR /Intelligent Sensor Board Remove the one screw. Remove the one screw. Disconnect the two connectors. Remove the Board To the Main To the Key Board Board IR Board p/n: EBR72670801 July 201 1 LCD TV 55LW5700...

  • Page 52: Removing The Keyboard

    On the left hand side there are two tabs. Using a thin object, lift the tabs outward, (to the left) to release them while pulling slightly towards you on the board. Remove the board Remove the board. July 201 1 LCD TV 55LW5700...

  • Page 53: Troubleshooting Section

    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 55LW5700...

  • Page 54: Power Supply Section

    24V output P201 pins 2, 3 and 4. P203 Connector: (To Panel LEDs) Turn on commands. 63V output P203 pins 1 and 13. P832 Connector: (To the Main Board) This connector receives the Local Dimming signals. July 201 1 LCD TV 55LW5700...
  • Page 55 55LW5700 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 56 55LW5700 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 57 55LW5700 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 P201 3.37V...
  • Page 58 • P201 (24V pins 2, 3 and 4) Pin 1 is the • P202 (56V pins 1 and 12) AND P203 (pins 1 and 13) Brown Wire (2) Remove AC power No Backlights during this test July 201 1 LCD TV 55LW5700...
  • Page 59 C256 + leg, see the Inverter Section of the Power Supply for additional checks. Note: If either P202 or P203 is disconnected, the backlights will come on, The Error line will go high, then the backlights shut off in 4~6 seconds. REMOVE AC POWER: July 201 1 LCD TV 55LW5700...
  • Page 60 This allows the panel to be darkened out in areas that are black or low brightness areas of the video. This allows for more deeper blacks and a thin design deeper blacks and a thin design. July 201 1 LCD TV 55LW5700...
  • Page 61 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 Block: VC-2B (EL67 Rivet) P203 pin 9 Block: VC-3C (EL72 Rivet) P202 pin 5 Block...
  • Page 62 Note: When the PWR_ON command Arrives, this voltage will read 56V. When the DRV_ON command arrives This voltage will rise to 63V. D253 D253 Location: Top Center of the SMPS Location: Top Center of the SMPS July 201 1 LCD TV 55LW5700...
  • Page 63 WARNING: Do not simply “Ground” any of the EL Test Points (EL62~EL77) to turn on an WARNING: Do not simply Ground any of the EL Test Points (EL62~EL77) to turn on an LED Block. The LED Block will be destroyed. July 201 1 LCD TV 55LW5700...
  • Page 64 *The drive signal changes due to the brightness level of the backlights. Low indicates “Bright”. High indicates “Dim”. kli ht L i di “B i ht” Hi h i di “Di ” Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...
  • Page 65 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 July 201 1 LCD TV 55LW5700...

  • Page 66: P832 Voltages And Diode Checks

    3.57V p/p 3 54V / 3.54V p/p Local Dimming On M0_MOSI V-SYNC Pin 4 P832 SCL2_3.3V Pin 1 P832 3.57V p/p 3 5V p/p 3.5V p/p SDA2 3 3V SDA2_3.3V Local Dimming Off VSYNC L_VS July 201 1 LCD TV 55LW5700...
  • Page 67 24V to the Main. The 63V Power Supply turns on too, but IC900. Range 0.37V to 3.3V. only generates 56V at this time. P-DIM1 3 66V p/p 50IRE 3.66V p/p 50IRE Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...
  • Page 68 Pins 1 and 2 for STBY and RUN. F100 Diode Mode values taken with all Connectors Removed F100 (Diode Check) F100 (Diode Check) Red or Black Lead on Fuse (Open) Other Lead on Hot Ground Bottom Left of SMPS SK100 July 201 1 LCD TV 55LW5700...
  • Page 69 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 55LW5700...

  • Page 70: Main Board Section

    • 3.3V_AU_AVDD (Made from 3.3V_Normal). 1.5V_FRC (IC5403) • 3.3V_DVDD (Made from 3.3V_Normal). • 1.8V (Made from 3.3V_Normal). HDMI SELECTOR VOLTAGES (IC701) • 24V (Direct from SMPS through L504). • 3.3V_HDMI (From 3.3V_Normal through L701) July 201 1 LCD TV 55LW5700...

  • Page 71: Mainboard Layout

    Wireless Remote HDMI 3 P901 To Ft. IR Component 1 HDMI 2 Composite 1 HDMI 1 RS232 Tuner TU2101 Headphones Component In Optical Component 2 These connectors are Audio Mini plug type Composite 2 July 201 1 LCD TV 55LW5700...
  • Page 72 55LW5700 Main Board (Front and Back Side) Component Layout P502 P3503 P502 "MAIN Board" to P201 "SMPS Board" RL_ON Drivers P101 Label STBY Diode Check Q502 Q501 Power Det (24V) IC502 PWR-ON 3.4V Q504 0.9V FET Switch Power Det (12V)
  • Page 73 55LW5700 Main Board (Front) Component Layout RL_ON Drivers P3503 Q502 Q501 P502 0.9V FET Switch 5V_Normal 3.3V_ L505 L1704 Q503 IC507 Normal IC501 IC505 L1703 Audio Amp +0.9V_CORE Q508 IC1702 12.38V IC506 0.9V FET Switch Each Pin L1708 IC5402 5V_USB...
  • Page 74 55LW5700 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 75 55LW5700 Main Board (Back Side) Component Layout IC502 Q504 Power Det (24V) Power Det (12V) INV_CTL IC503 Driver Q1701 MAIN BOARD Amp_Mute p/n: EBT61410207 SPI Flash IC5202 RGB_DDC_SCL Q102 RGB_DDC_SDA Q101 Q710 Panel Vcc Q505 Q801 Drivers Q506 D713 Side HP Mute...
  • Page 76 55LW5700 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 77 Bottom leg X601 IC601 Micro Crystal 1.57V Either leg Either leg 2 31V / 2.31V p/p Runs when set is on MAIN Board 3 3V / 3.3V p/p 10Mhz 10Mhz Runs all the time July 201 1 LCD TV 55LW5700...
  • Page 78 Collector which is tied to AMP MUTE PDN AMP_MUTE_PDN Pin 19 P1702 Connector "Main" To "Speakers" Label Diode Check SPK-R(-) 12.48V SPK-R(+) 12.48V SPK-L(-) 12.48V SPK-L(+) 12.48V Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...
  • Page 79 P3503 Local Dimming Waveform Information MOSI Pin 5 P3503 SCLK Pin 3 P3503 3.57V p/p 3.54V p/p Local Dimming On Local Dimming On MOSI Pin 5 P3503 V-SYNC Pin 8 P3503 3.57V p/p 3.5V p/p Local Dimming Off July 201 1 LCD TV 55LW5700...
  • Page 80 PDIM Pin 22 can vary according to incoming video IRE level, OSD Backlight setting and Intelligent Sensor (room light condition). Range 0.2V to 3.3V. P DIM1 P-DIM1 3.66V p/p 50IRE Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...

  • Page 81: P3501 "Main" To "T-Con" Voltage And Diode Check

    1.13V TXACLKN 1.19V 0.84V TXB3P 1.18V 1.13V TXACLKP 1.23V 1.12V TXB4N 1.23V 1.13V There are no Stand-By Voltages for the Connector Pins in Bold Diode Mode values taken with all Connectors Removed are Video. July 201 1 LCD TV 55LW5700...

  • Page 82: P3502 "Main" To "T-Con" Voltage And Diode Check

    TXC3N 1.24V 1.12V Pins in Bold are Video Signals. There are no Stand-By Voltages for the Connector There are no Stand By Voltages for the Connector. Diode Mode values taken with all Connectors Removed. July 201 1 LCD TV 55LW5700...

  • Page 83: P901 Main Board To (Ft. Ir/Intelligent Sensor) Voltage And Diode Check

    Clock & Data pulses only present when Intelligent Sensor is turned on. (3.6V p/p) IR pulses (2V p/p) Clock & Data pulses only present when Set is turned on or Off. (3.9V p/p) Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...
  • Page 84 *25V Switched from Q1002 Drain front side of the board. Q1002 turned on by Q1001 front side of the board Q1002 turned on by Q1001 front side of the board. Q1001 turned on by Microprocessor pin 38. July 201 1 LCD TV 55LW5700...

  • Page 85: T-Con (Tft Drive) Section

    US1 and U6 are DC to DC converters which develop the Panels driver voltages. These voltages can be read at the ribbon connector or at test locations on the board which are d t th th b d hi h identified on the following pages. T-CON July 201 1 LCD TV 55LW5700...

  • Page 86: 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 55LW5700...
  • Page 87 55LW5700 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 88 5. The marks are off one pin to the left. 5 is actually 6. Apply AC to the Power Supply and Toggling patterns of White, Red, Blue, Green should appear on the screen July 201 1 LCD TV 55LW5700...

  • Page 89: Cn1 T-Con Connector Cn1 To The Main Pwb (Voltage And Diode Check)

    But is not used by the Main Board. Fi t h First hash mark is off by 1 pin. ff b 1 i Starts on pin 6. Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...

  • Page 90: Cn2 T-Con To The Main Pwb (Voltage And Diode Check)

    1.94V TXD4N 1.31V 1.94V TXCCLKP TXCCLKP 1 22V 1.22V 1 94V 1.94V TXD4P TXD4P 1 20V 1.20V 1 94V 1.94V TXC3N 1.24V 1.94V TXC3P 1.16V 1.94V Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...

  • Page 91: Front (Ir, Intelligent Sensor And Power Led) Section

    The Intelligent Sensor circuit receives it’s operational voltage when the set turns on via pin 11 (3 3V Normal) The Intelligent Sensor circuit receives it s operational voltage when the set turns on via pin 11 (3.3V_Normal). Front IR Board p/n EBR72670801 p/n EBR72670801 To Main Board To Key Board July 201 1 LCD TV 55LW5700...

  • Page 92: Gaining Access To The Front Ir/Key Board

    Gaining access to the Front IR/Key Board IR/Key board p/n EBR72670801 Rear View Front View IR Receiver and Intelligent Sensor July 201 1 LCD TV 55LW5700...
  • Page 93 Clock & Data pulses only present when Intelligent Sensor is turned on. (3.6V p/p) IR pulses (2V p/p) Clock & Data pulses only present when Set is turned on or Off. (3.9V p/p) Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...

  • Page 94: Key Board Section

    Key line pulls down to a certain value. This DC value is monitored by the Microprocessor and it interprets the Key that was pressed. To Front IR. P100 Front Key Board p/n EBR73361101 p/n EBR73361101 Front IR Front IR July 201 1 LCD TV 55LW5700...
  • Page 95 Pin 2 from P100 to IR Board. Out Pin 5 to P901 on the Main board. P100 Pins 1 and 3 in Diode Mode reads OL. Pins 2 and 4 are ground. Diode Mode values taken with all Connectors Removed July 201 1 LCD TV 55LW5700...
  • Page 96 INVISIBLE SPEAKER SECTION Either Speaker P/N: EAB62088401 The 55LW5700 contains the Invisible Speaker system. The 55LW5700 contains the Invisible Speaker system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports. July 201 1 LCD TV...

  • Page 97: Interconnect Diagram (11 X 17 Foldout Section)

    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. July 201 1 LCD TV 55LW5700...
  • Page 98 55LW5700 INTERCONNECT DIAGRAM P201 "SMPS Board" To P502 "MAIN Board" P832 "SMPS" to P3503 "MAIN Board" P3503 "Main" to P832 "SMPS" Note: If a particular area is exhibiting a dimmer backlight level than other areas or Label STBY Diode Check...
  • Page 99 55LW5700 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 100 55LW5700 Main Board Components on in (Stand_By 3.5V) and with (24V) Components on by Stand_By 3.5V Components on by 24V +3.5V_ST Q502 RL_ON SW (Not On) +24V +24V +3.5V_ST IC502 Power Det (24V) Q504 P502 Q1701 +3.5V_ST Audio Mute INV_CTL...
  • Page 101 55LW5700 Main Board Components on with (12V) and Other Voltage Distributions Other Voltage Distributions VDD33 L5201 Components on by 12V L5206 DVDD_DDR_1V AVDD33 IC5201 Frame Rate L5205 +1.26V_FRC +3.3V_FRC L5203 Converter VDDC10 AVDD_PLL L5204 AVDD_LVDS_3.3V +12V 0.9V FET Switch IC5403...
  • Page 102 4. Page 95 cleaned up the Table related to Resistance and 95 l th T bl l t d t R Voltages for the Soft Touch Key Board. This concludes the 55LW5700 l d th 55LW5700 training session. Back to Pg 1...

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