LG 42LB4D Training Manual
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Also See for 42LB4D:
- Troubleshooting manual (39 pages) ,
- Specifications (2 pages) ,
- Owner's manual (446 pages)
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Table of Contents
Troubleshooting
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Summary of Contents for LG 42LB4D
- Page 1 LG TRAINING MANUAL LG TRAINING MANUAL 42LB4D LCD - Fall 2007...
- Page 2 This manual was prepared for use only by properly trained audio-visual service technicians. 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.
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Page 3: Table Of Contents
TAblE OF CONTENTS OVERVIEW ....................5 INTRODUCTION ....................5 COMPUTER CONNECTION ..................5 MODEL NUMBER STRUCTURE ................... 5 SERIAL NUMBER STRUCTURE .................. 6 SERVICE MENU ..................... 6 SERVICE REMOTE ....................7 THEORy .......................9 LIqUID CRySTAL DISPLAy ..................9 LIqUID CRySTAL PANEL ..................10 TROUBLESHOOTING - POWER ................. - Page 4 - 4 -...
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Page 5: Overview
Overview OvERvIEW INTROduCTION The 42LB4D is a HD LCD TV with integrated HD tuner. This model will accept 1080p and downconvert it to 1080i. Features include USB Media Host and SimpLink. USB Media Host consists of a USB port on the back of the TV that supports USB flash memory drives loaded with media or firmware for the TV. -
Page 6: Serial Number Structure
Overview SERIAl NuMbER STRuCTuRE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Sequential Number (XXXXXXX), 5 to 7 digits (Number or Alphabet) Production Line (VV) , 2 digits (Alphabet) Production Site (SS), 2 digits (Alphabet) Last digit of Year and Month for Production (YMM), 3 digits (Number) [Example] 403MXXQ05106 1 2 3... -
Page 7: Service Remote
Overview SERvICE REMOTE NUM KEY FUNCTION POWER To turn the TV on or off POWER ON To turn the TV on automatically if the power is supplied to the TV. Use the POWER key to deactivate; It should be deactivated when delivered. MUTE To activate the mute function. - Page 8 - 8 -...
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Page 9: Theory
TheOry ThEORY Liquid Crystals This section covers how an LCD Display works. Polarizer Color Filters lIquId CRYSTAl dISPlAY A Liquid Crystal Display is composed of a light source Back Light (backlight), a Liquid Crystal Panel, and a driving circuit. We start with a light source at the back of the panel composed of Polarizer thin fluorescent bulbs (CCFLs - Cold Cathode Flouresent Lamps). -
Page 10: Liquid Crystal Panel
TheOry lIquId CRYSTAl PANEl Below (on the left) is a cross section of a liquid crystal panel. The key to an LCD’s operation is the polarizers. The polarizers only allow a certain wavelength of light to pass through. The two polarizers are mounted at a 90 degree angle with respect to each other, which prevents light from passing through. -
Page 11: Troubleshooting - Power
POWER TrOUBLeShOOTiNG TROublEShOOTING - POWER POWER SuPPlY PSu CONNECTORS Connector Connector Stan P201 Standby P202 18.86 3.0V 18.86 6.11 3.2V 3.2V 3.46 0.22V 2.753 11.99 3.2V 6.11 3.4V on 2.5V Directview LCD Training Troubleshooting... -
Page 12: Psu Ballast Connectors
POWER TrOUBLeShOOTiNG PSu bAllAST CONNECTORS BALLAST / INVERTER BALLAST / INVERTER P205 Label Standby RUN mode P204 Label Standby Run Mode VBL - +24.12VDC 23.93V VBL - +24.12VDC 23.93V VBL - +24.12VDC 23.93V VBL - +24.12VDC 23.93V VBL - +24.12VDC 23.93V VBL - +24.12VDC 23.93V... -
Page 13: Psu Connectors - Full List
POWER TrOUBLeShOOTiNG PSu CONNECTORS - Full lIST Resistance Measurements, Pin to common ground. Directview LCD Training Troubleshooting... -
Page 14: Ic Distribution Chart
POWER TrOUBLeShOOTiNG IC dISTRIbuTION ChART Directview LCD Training Troubleshooting... -
Page 15: C Bus Data Control Lines
POWER TrOUBLeShOOTiNG C buS dATA CONTROl lINES Directview LCD Training Troubleshooting... -
Page 16: Power Supply Flowchart
POWER TrOUBLeShOOTiNG POWER SuPPlY FlOWChART Directview LCD Training Troubleshooting... -
Page 17: Troubleshooting - Video
VidEO TrOUBLeShOOTiNG TROublEShOOTING - vIdEO vIdEO blOCk dIAGRAM Directview LCD Training Troubleshooting... -
Page 18: Video Flowchart
VidEO TrOUBLeShOOTiNG NO vIdEO FlOWChART Directview LCD Training Troubleshooting... -
Page 19: Lcd Control Board
VidEO TrOUBLeShOOTiNG lCd CONTROl bOARd Directview LCD Training Troubleshooting... - Page 20 VidEO TrOUBLeShOOTiNG Check: Video data from LVDS Transmitter (IC601). The diagram shown, points out the test points for the Video Data transmitted to the LCD Control PCB. Points highlighted are above the LVDS cable connection Directview LCD Training Troubleshooting...
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Page 21: Rf - Video Flowchart
VidEO TrOUBLeShOOTiNG NO RF - vIdEO FlOWChART Directview LCD Training Troubleshooting... -
Page 22: Rf - Ntsc
VidEO TrOUBLeShOOTiNG NO RF - NTSC Directview LCD Training Troubleshooting... -
Page 23: Rf - Atsc
VidEO TrOUBLeShOOTiNG NO RF - ATSC Directview LCD Training Troubleshooting... -
Page 24: Av1/Av2 Audio
VidEO TrOUBLeShOOTiNG Av1/Av2 AudIO Directview LCD Training Troubleshooting... -
Page 25: Composite Video Input
VidEO TrOUBLeShOOTiNG COMPOSITE vIdEO INPuT Directview LCD Training Troubleshooting... -
Page 26: Component Video Input
VidEO TrOUBLeShOOTiNG COMPONENT vIdEO INPuT Directview LCD Training Troubleshooting... -
Page 27: Component Input Flowchart
VidEO TrOUBLeShOOTiNG COMPONENT INPuT FlOWChART Directview LCD Training Troubleshooting... -
Page 28: Rgb Video Input
VidEO TrOUBLeShOOTiNG RGb vIdEO INPuT Directview LCD Training Troubleshooting... -
Page 29: Hdmi Signal Path
VidEO TrOUBLeShOOTiNG hdMI SIGNAl PATh Directview LCD Training Troubleshooting... -
Page 30: Component/Rgb Flowchart
VidEO TrOUBLeShOOTiNG COMPONENT/RGb FlOWChART Directview LCD Training Troubleshooting... -
Page 31: Defective Video Flowchart
VidEO TrOUBLeShOOTiNG dEFECTIvE vIdEO FlOWChART Directview LCD Training Troubleshooting... -
Page 32: Troubleshooting - Audio
AudiO TrOUBLeShOOTiNG TROublEShOOTING - AudIO AudIO SIGNAl PATh Directview LCD Training Troubleshooting... -
Page 33: Audio Out Flowchart
AudiO TrOUBLeShOOTiNG NO AudIO OuT FlOWChART Directview LCD Training Troubleshooting... -
Page 34: Rf Sound
AudiO TrOUBLeShOOTiNG NO RF SOuNd Directview LCD Training Troubleshooting... -
Page 35: Rf Sound Flowchart
AudiO TrOUBLeShOOTiNG NO RF SOuNd FlOWChART Directview LCD Training Troubleshooting... -
Page 36: Dtv Sound
AudiO TrOUBLeShOOTiNG NO dTv SOuNd Directview LCD Training Troubleshooting... -
Page 37: Sound From Inputs
AudiO TrOUBLeShOOTiNG NO SOuNd FROM INPuTS Directview LCD Training Troubleshooting... -
Page 38: Hdmi Sound
AudiO TrOUBLeShOOTiNG NO hdMI SOuNd Directview LCD Training Troubleshooting... -
Page 39: Usb Media Device Flowchart
AudiO TrOUBLeShOOTiNG uSb MEdIA dEvICE FlOWChART Directview LCD Training Troubleshooting... -
Page 40: Disassembly
DiSaSSemBLy dISASSEMblY ExPlOdEd vIEW Directview LCD Training Disassembly... -
Page 41: Exploded View Parts
DiSaSSemBLy ExPlOdEd vIEW PARTS Directview LCD Training Disassembly... - Page 44 2007 42LB4D LCD Training...