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LG 42LH50 Training Manual
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LG 42LH50 Training Manual

1080p direct view lcd
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1080P
Direct View LCD
42LH50 Direct View LCD
42LH50 Direct View LCD

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Summary of Contents for LG 42LH50

  • Page 1 1080P Direct View LCD 42LH50 Direct View LCD 42LH50 Direct View LCD...

  • Page 2: Table Of Contents

    42LH50 TABLE OF CONTENTS TOPICS PRELIMINARY ......2 BACKLIGHT SECTION .... 29 MAIN BOARD SECTION ..48 Outline ........... 2 Removing the Main board ....49 EEFL Introduction ......30 Overview ........3 EEFL to CCFL ....... 31 Main board layout ......50 Safety Notice and Cautions ...

  • Page 3: Preliminary

    LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages Section 2 Circuit Board Operation, Troubleshooting of : • Switch mode Power Supply/Ballast Combination • Main Board Internet Connection • Ft Control Board • Side Keys 2009 FALL LCD DV 42LH50...

  • Page 4: Overview

    Overview of Topics to be Discussed Overview of Topics to be Discussed 42LH50 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 5: Safety Notice And Cautions

    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 6: 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. 2009 FALL LCD DV 42LH50...

  • Page 7: Contact Information

    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 Plasma Panel Also available on the Also available on the New Training Materials on...

  • Page 8: Handling And Safety

    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… 2009 FALL LCD DV 42LH50...

  • Page 9: 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. 2009 FALL LCD DV 42LH50...

  • Page 10: Product Information

    42LH50 Product Information 42LH50 Product Information This section of the manual will discuss the specifications of the 42LH50 LCD Direct View Display Panel. 2009 FALL LCD DV 42LH50...

  • Page 11: Feature List

    Basic Specifications Basic Specifications Key Features • LG NetCast™ Entertainment Access* • (Netflix®, YouTube™, Yahoo!® Widgets, • My Media Access CIFS) • TruMotion 120Hz • Full HD 1080p HD Resolution • 70,000:1 Dynamic Contrast Ratio • 2.7ms Response Time (GTG) •...

  • Page 12: Pixel Count Explained

    1365 (H) × 768 (V) Possible Frame Interlaced Rates: 2 Fields to make a Frame 24FPS 1080P Panel 1920 (H) x 1080 (V) 30FPS Progressive 60FPS Each Field is a Frame Think of sync as the Panels “Refresh Rate” 2009 FALL LCD DV 42LH50...

  • Page 13: Product Logos

    Basic Specifications (LOGO Familiarization) Basic Specifications (LOGO Familiarization) Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. 2009 FALL LCD DV 42LH50...

  • Page 14: Remote Control

    Remote Control Familiarization Remote Control Familiarization BOTTOM PORTION TOP PORTION 2009 FALL LCD DV 42LH50...

  • Page 15: Accessing Service Menu

    “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: If a Password is required to enter the Service Menu. Enter; 0000 2009 FALL LCD DV 42LH50...

  • Page 16: Rear And Side Inputs

    Rear and Side Input Jacks Rear and Side Input Jacks Side In/Out USB Port Software Upgrades Music, Photos Rear In/Out Jacks Internet Port MAIN PWB Rear and Side Input/Output locations 2009 FALL LCD DV 42LH50...

  • Page 17: Software Download Screen

    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”. 9) Your TV will be restarted automatically. 2009 FALL LCD DV 42LH50...

  • Page 18: Dimensions

    42LH50 PRODUCT DIMENSIONS 42LH50 PRODUCT DIMENSIONS There must be at least 4 inches of Clearance on all sides 3-5/8" 91.4mm 41-3/8" Wattage 1051.6mm Average 197W 7-7/8" Stand By 0.22W 200mm 16-3/4" 8-13/16" 425mm 224mm 12-15/16" 25-7/8" 327.8mm 657.9mm 4-1/16" 7-7/8"...

  • Page 19: Troubleshooting

    Disassembly: This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42LH50 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 20: Back Cover Removal

    Pay attention to the size and type of screw as there are many different types. Putting in an improper screw when reassembling may Cause damage. The Stand and its bottom two screws do not need to be removed before removing the back. 2009 FALL LCD DV 42LH50...

  • Page 21: Circuit Board Layout

    T-CON LVDS Cable LVDS Cable Main PWB POWER SUPPLY Side Keys Backlight Backlight Connection Connection Backlight Connections Input Rear Input Inputs Speaker R Tweeter R Master Power Speaker L Tweeter L Ft IR/LED Control Switch 2009 FALL LCD DV 42LH50...

  • Page 22: Power Supply Section

    FETs (on the far left hand heat sink) which in turn switch the primary sides of the two ballast transformers T703 and T704. They output 1.2Kv (48Khz) pulses to the backlights via P401 and P402. 2009 FALL LCD DV 42LH50...

  • Page 23: Power Supply Board Removal

    Supply PWB Supply PWB Removal Removal P201 Disconnect P201 P201, P401, P402, AC In SK101 and SK102. Remove the 6 screws indicated by the arrows Press in w/screw. Two tabs to release lock P402 P401 SK102 2009 FALL LCD DV 42LH50...

  • Page 24: Master Power Switch Warning

    Power Supply (Master Power Switch) Location Power Supply (Master Power Switch) Location If the TV won’t come on, be sure to check the Master Power Switch before assuming a failure has occurred. MASTER AC SWITCH LOCATION (Bottom Right Side) 2009 FALL LCD DV 42LH50...

  • Page 25: Power Supply Layout

    From Hot Gnd dashed line are referenced to Hot Gnd TP for checking backlight drive signals F100 6.3A/250V To Backlights AC IN Left Side P402 Master Power Switch To Backlights AC IN SK102 Right Side P401 SK101 2009 FALL LCD DV 42LH50...

  • Page 26: Power Supply Start Up Sequence

    42LH50 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB 42LH50 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB Master (Main) Power Sw BALLAST SECTION POWER SUPPLY (SMPS) Power Supply will 1.2Kv not be on if Main 380V Ballast Power Switch is off.

  • Page 27: Power Supply Micro Commands

    42LH50 P2400 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT 42LH50 P2400 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT L2400 Q2406 R2416 47KΩ LVDS 12V Panel Power Q2404 R2417 47KΩ 0.6V L2411 STBY5V IC3202 SMPS MAIN PWB...

  • Page 28: Power Supply Testing Step 1

    (PWR). Apply AC. This will turn on the power supply. a) Check that the 24V and 12V power supplies are turned on, • P201 (24V pins 17 and 18) • P201 (12V pins 13 and 14) (2) Remove AC power. 2009 FALL LCD DV 42LH50...

  • Page 29: Power Supply Testing Step 2

    Check the connections to the Backlights. DO NOT check these when AC is applied as they carry 1.2Kv each. Note, either of the connections are unplugged, the backlights will not light. Use P2400 “Main” Side to insert resistors 2009 FALL LCD DV 42LH50...

  • Page 30: Backlight Section

    General Backlight Information General Backlight Information Ballast Section of SMPS To Backlights Over 1.2KV To Backlights Over 1.2KV EEFL (External Electrode Fluorescent Lamp) LOW COST Large number of lamps driven by a single inverter 2009 FALL LCD DV 42LH50...

  • Page 31: Eefl Introduction

    Introducing EEFL Simple structure, Low price Simple structure Low Cost Complicated structure Lamp manufacturing process Large number of Lamp Lamp assembly structure Drive by single inverter 2009 FALL LCD DV 42LH50...

  • Page 32: Eefl To Ccfl

    Introducing EEFL Contacts (Bulb Design) 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 2009 FALL LCD DV 42LH50...
  • Page 33 Ballast PWB Layout Ballast PWB Layout Viewed from rear SMPS PWB Backlights Test Point Bottom of R406 or R403 38V P/P 48Khz P402 To Backlights T704 Left Side 1.2Kv P401 To Backlights Right Side T703 2009 FALL LCD DV 42LH50...

  • Page 34: Ballast Turn On Signals

    42LH50 P2400 on Main PWB To Power Supply P201 Ballast Turn On Circuit 42LH50 P2400 on Main PWB To Power Supply P201 Ballast Turn On Circuit MAIN PWB POWER SUPPLY BALLAST P201 P2400 R2425 SECTION 1KΩ IC3202 Stand By 5V...

  • Page 35: P-Dim Effect On The Drive

    IC. After 4 attempts, if ADIM also the Error Out line manipulates returns to 5V, this the Burst tells the Micro to turn the set off. Triangle Oscillator But it is not used. 2009 FALL LCD DV 42LH50...

  • Page 36: P201 Connector Checks

    PDIM Pin 24 can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the video processor IC100. Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 37: Sk100 And Sk101 Checks

    2 in STBY and RUN with one lead on Neutral of SK100. Bottom With the Master Power Switch Right of Closed (On) AC flows. F100 SMPS When Open (Off) AC open and does not flow. F100 6.3A/250V AC IN Neutral Live SK101 SK100 2009 FALL LCD DV 42LH50...

  • Page 38: T-Con Section

    U5 is a DC to DC converter IC which develops the Panels driver voltages. 16V, 3.3V, -5V and 26V. These voltages can be read at the ribbon connector or at test points on the board. 2009 FALL LCD DV 42LH50...

  • Page 39: Removing The T-Con Board

    Be sure to reinstall them if Remove the 3 Screws in the T-CON servicing the T-CON PWB. shield and remove the shield Disconnect CN1, CN2, CN4 and CN5. STEP (2) See next slide for details about removing cables. 2009 FALL LCD DV 42LH50...

  • Page 40: Removing The Lvds Cables

    Press In Press In Press In To remove the LVDS cables CN1 and CN2; Press in on the two tabs and slowly rock the cable out of the connector. (Shown by the arrows in Figure above) 2009 FALL LCD DV 42LH50...

  • Page 41: Removing Locking Tabs

    Fig 1 Fig 2 CN5 or CN4 Locked Flip the lock up and back from the flex cable. Then the flex cable can be easily removed. Unlocked Fig 3 The locking tab is flipped down 2009 FALL LCD DV 42LH50...

  • Page 42: T-Con Layout

    CON (TFT Drive) PWB (Shield Removed) CON (TFT Drive) PWB (Shield Removed) To TFT Panel To TFT Panel T-CON p/n: EAT60663701 LED1 Remember to replace screws for Main PWB ground purposes if testing the PWB. 2009 FALL LCD DV 42LH50...

  • Page 43: T-Con Component Locations

    42LH50 T-CON (TFT Drive) PWB Drawing (Components and Voltages Identified) 42LH50 T-CON (TFT Drive) PWB Drawing (Components and Voltages Identified) -4.9V -4.9V Pin 56,57,58 Pin 2 Pin 59 Pin 3,4,5 TO TFT MODULE Pin 53,54 3.3V Pin 4 Pin 57 Pin 7,8 3.3V...

  • Page 44: T-Con Voltage Checks

    Anode 3.3V Cathode 0V Cathode 0.7V Cathode 1.4V LED OFF LED ON LED OFF Anode Cathode Check the Regulator T-CON PWB U11 for Correct Voltage Check Fuse F1 for 12V 1.8V 3.3V From Pins 48~51 2009 FALL LCD DV 42LH50...

  • Page 45: T-Con Panel Voltage Generation

    CON (TFT Driver) Board CN4 and CN5 (Voltage Sources) Source D9 Anode 3.3V Source 3.3V Source Cathode Pin 8 Pin 23, 24 3.3V Pin 37,38 Chip B+ Pin 42 16V (D6) Cathode Not for Panel T-CON PWB 16.9V 2009 FALL LCD DV 42LH50...

  • Page 46: Cn4 And Cn5 Voltage Checks

    CON (TFT Driver) Board CN4 and CN5 (Voltage Check) CON (TFT Driver) Board CN4 and CN5 (Voltage Check) 3.3V 3.3V Pin 7,8 Pin 53,54 Pin 59 Pin 3,4,5 Pin 56,57,58 Pin 2 Pin 57 Pin 4 T-CON PWB 2009 FALL LCD DV 42LH50...

  • Page 47: Cn1 Voltage Checks

    Open URSA-A2P 1.4V Open URSA-BCKM 1.22V Open *Pin 8 (PWM-DIM) is not URSA-A2M 1.4V Open used by the T-CON board. URSA-B3P 1.2V Open URSA-ACKP 1.25V Open URSA-B3M 1.21V Open URSA-ACKM 1.26V Open URSA-B4P 1.44V Open 2009 FALL LCD DV 42LH50...

  • Page 48: Cn2 Voltage Checks

    1.2V Open URSA-DCKP 1.23V Open URSA-C2P 1.3V Open URSA-DCKM 1.29V Open URSA-C2M 1.2V Open URSA-D3P 1.3V Open URSA-C2P 1.23V Open URSA-D3M 1.25V Open URSA-C2M 1.23V Open URSA-D4P 1.4V Open URSA-D4M 1.15V Open URSA-C3P 1.3V Open 2009 FALL LCD DV 42LH50...

  • Page 49: Main Board Section

    • 1.8V GENERAL BCM VIDEO PROCESSOR • 5V (Actually just switched STBY 5V • 1.2V, 1.26V, 1.8V, and 3.3V input from the power supply). TUNER and VSB CIRCUIT • 9V • 5V • 3.3V • 1.2V 2009 FALL LCD DV 42LH50...

  • Page 50: Removing The Main Board

    P3400 check on top and behind the Video and P2300 Tru-Motion Processor ICs. Look for a piece of Chocolate (Heat Transfer Material). Be sure to transfer to new PWB if present on the old one. 2009 FALL LCD DV 42LH50...

  • Page 51: Main Board Layout

    42LH50 MAIN PWB 42LH50 MAIN PWB P1100 P1101 COMPONENT LAYOUT COMPONENT LAYOUT IC1101 IC1101 Operates at high temperature Motion IC2406 L2418 1.6V 1.6V 12Mhz X1100 IC2408 P1102 Q2407 L2416 IC2402 IC2405 Q2402 IC2403 IC2401 Q2404 1 2 3 P201 P2400...

  • Page 52: Front Side Component Voltages

    42LH50 MAIN (FRONT SIDE) SIMICONDUCTORS IC102 BCM Reset IC2400 1.2V Core IC2404 3.3V-ST IC2500 9V Reg IC501 HDMI Remote Q2406 5V and Pin for Tuner 3.3V-VDDP-ST LVDS 12V Switch 1 3.3V [1] Gnd 1 Gnd [1] 12.3V [1] 3.3V [1] 5V...

  • Page 53: Main Board (Back Side) Layout

    42LH50 42LH50 Main Board Main Board IC1100 (Back Side) (Back Side) Component Layout Component Layout Q100 Q2400 IC103 Q3401 Q3400 TUNER TU2500 TDVW-H103F Q2501 19 Video 16 SIF 13 DIF - 12 DIF + IC2102 Q2500 D2128 (5V) 4 IC2100...

  • Page 54: Back Side Component Voltages

    42LH50 MAIN (BACK SIDE) SIMICONDUCTORS IC103 BCM EEPROM IC2102 IC2100 RS232 Q100 IC101 Flash Q2501 Tuner Video Pin EEPROM Rx/Tx Pin Write Protect Buffer 3.3V 3.4V 5.4V 3.3V 2.79V 3.3V (-5V) Q2400 12V PWR Ctl Q3400 LED PWR On 3.3V 3.7V...

  • Page 55: Crystal Checks

    1.6V 1.58V Set on Set on or off. X200 Crystal X200 1.49V Set on. Use 1.5V X1100 bottom leg L208 X3200 of L208 1.4V 1.4V 1Vp/p 54Mhz X200 X3200 1.8Vp/p 24Mhz Left Leg MAIN PWB 2009 FALL LCD DV 42LH50...

  • Page 56: Ld2400 Functions

    3.37V Output • 12V from Power Supply is arriving. 3.37V Output • Q2405 (12V PWR) switch is working. • IC2403 is outputting voltage. •(A3.3V regulator) •(+3.3V regulator) Main PWB LD2400 and IC2403 Locations •(+3.3V-MEMC regulator) 2009 FALL LCD DV 42LH50...

  • Page 57: Tuner With Shield Off

    Main PWB Tuner with Shield Off (Pin ID) Main PWB Tuner with Shield Off (Pin ID) 2009 FALL LCD DV 42LH50...

  • Page 58: Tuner Signal Checks

    MAIN PWB Tuner Location Pin 19 “Video” Signal 2.24Vp/p Pin 16 “SIF” Pin 1 Signal Pin 12 and Pin 13 “Dig IF” Signal 450mVp/p Note: “Dig IF” Signal only when 700mVp/p receiving a Digital Channel. 2009 FALL LCD DV 42LH50...

  • Page 59: Clock And Data Lines

    Main PWB Tuner Clock and Data Lines Main PWB Tuner Clock and Data Lines Pin 9 SCL Note: SCL and SDA only active during an actual Channel Change. 1V per/div 100uS 5V p/p Pin 8 SDA 1V per/div 100uS 5V p/p 2009 FALL LCD DV 42LH50...

  • Page 60: P2400 Connector Check

    PDIM Pin 24 can vary according to type of signal being processed, OSD Backlight setting. 0.6V 0% to 3.3V 100% and the Intelligent Sensor. Output from the Video Processor IC100. Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 61: P1100 Connector Check

    1.09V 1.23V URSA-B3P 1.44V 1.23V URSA-A2M 1.4V 0.88V URSA-A2P 1.4V 1.22V URSA-BCKM 1.22V 1.14V URSA-A1M 1.2V 1.11V URSA-BCKP 1.21V 1.25V URSA-A1P 1.3V 1.23V URSA-A0M 1.2V 1.18V URSA-B2M 1.13V 1.23V URSA-A0P 1.3V 1.05V URSA-B2P 1.4V 0.87V 2009 FALL LCD DV 42LH50...

  • Page 62: P1101 Connector Check

    URSA-C0M 1.2V 1.20V URSA-D2P 1.3V 0.87V URSA-C0P 1.28V 0.87V URSA-D1M 1.3V 1.23V URSA-D1P 1.29V 0.87V URSA-D0M 1.25V 1.23V URSA-D0P 1.29V 0.87V URSA-C4M 1.18V 1.08V URSA-C4P 1.13V 1.07V Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 63: P3400 Connector Check

    3.3V 3.3V Open Key1 3.3V 3.3V 1.91V Key2 3.3V 3.3V 1.91V 5V ST 5.05V 5.05V 1.5V 2.69V 2.69V 1.3V 3.3V_ST 3.29V 3.3V 0.69V LED On/Off 3.3V Open Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 64: P2300 Connector Check

    Check SPK-R (-) 10.7V Open SPK-R (+) 10.7V Open SPK-L (-) 10.7V Open SPK-L (+) 10.7V Open Use speaker out to test for defective Audio Amp IC2301 Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 65: Front Ir And Led

    The Key board connector P3000 is routed to the Ft control board via P2. Then through the front Control board and out P2 to P1200 pins 4 and 5 and then to the Microprocessor. Finally, the front Power LEDs are controlled by P1 connector pin 12 and pin 8. 2009 FALL LCD DV 42LH50...

  • Page 66: Connectors Identified

    FRONT CONTROL BOARD CONNECTIONS IDENTIFIED FRONT CONTROL BOARD CONNECTIONS IDENTIFIED The below picture shows the connections to the Front Control board. p/n EBR59216901 Side P3000 Main Power Switch 2009 FALL LCD DV 42LH50...

  • Page 67: Components Identified

    The Front Control PWB (located on the bottom left as viewed from the rear) contains the IR (Infrared Remote Sensor) and the Intelligent Sensor plus the front Power LEDs. Power LEDs Light Diffuser Intelligent Sensor Infrared Sensor 2009 FALL LCD DV 42LH50...

  • Page 68: P1 And P2 Connector Checks

    3.3V Open Key2 3.3V 3.3V Open Key 2 3.3V 3.3V Open 5V ST 5.05V 5.05V 1.13V 2.67V 2.67V Open 3.3V_ST 3.29V 3.3V Open LED On/Off 3.3V Open Diode Mode values taken with all Connectors Removed 2009 FALL LCD DV 42LH50...

  • Page 69: Side Key Section

    Side Key Assembly Side Key Assembly SW3001 SW3002 SW3003 SW3004 SW3005 SW3006 SW3007 SW3008 P3000 To Ft Control P3000 2009 FALL LCD DV 42LH50...

  • Page 70: P3000 Connector Checks

    Volume (+) 0.906V Menu 1.65V CH (Dn) 1.65V Enter 2.24V CH (Up) 2.24V P3000 Connector “Side Key" to “IR/LED Control PWB“ P1 Label STBY Diode Check Key1 3.3V 3.3V Open P3000 Key2 3.3V 3.3V Open 2009 FALL LCD DV 42LH50...
  • Page 71 AUDIO SECTION (Cabinet Speakers) AUDIO SECTION (Cabinet Speakers) The following section covers the Speakers used in the 42LH50 2009 FALL LCD DV 42LH50...

  • Page 72: Speakers Identified

    Invisible Speaker System Overview (Full Range Speakers) Invisible Speaker System Overview (Full Range Speakers) The 42LH50 contains the full progression of the Invisible Speaker system. First: The woofer layout is the basic system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports.

  • Page 73: Invisible Speakers

    EAB58536001 Speaker Attachment post Invisible Speaker Tweeter shown separately. The Front (down) has sticky surface which adheres to Cabinet works as Outlined front bezel. Note, there is no a diaphragm. Circle diaphragm, only voice coil. 2009 FALL LCD DV 42LH50...

  • Page 74: Tweeter Layout

    Mount adheres to front bezel. Note, there is Speaker no Cone (Diaphragm), only voice coil. Terminals Spider Speaker Wires FRONT BACK Dust Cap SIDE SIDE with Magnet adhesive Voice Coil Inside Frequency Pass Capacitor Mount 2009 FALL LCD DV 42LH50...

  • Page 75: 11X17 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. 2009 FALL LCD DV 42LH50...
  • Page 76 OSD Backlight setting. Power Supply P1100 P1101 0.6V 0% to 3.3V 100%. Output from the BCM chip. MAIN (Digital) Board IC1100 42LH50 MAIN PWB COMPONENT LAYOUT SMPS TEST 1: To Force IC1101 IC1101 Power Supply On. Operates at high R406 / R403...
  • Page 77 42LH50 MAIN (FRONT SIDE) SIMICONDUCTORS IC102 BCM Reset IC2103 RS232 IC2401 5V USB IC2404 3.3V-ST IC2407 A2.5V Reg IC2502 5V Reg IC3211 Power Det Q2401 24V PWR Sw Q2406 5V and Rx/Tx Pin for Tuner Q2405 3.3V-VDDP-ST LVDS 12V Switch 1 3.3V...

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