NEC MultiSync 20WGX2 Series Manuals

Table of Contents

• 38

  Adjustment Procedures

  • • 38

      Table of Contents

  • 39

    1 Application

  • 39

    2 Default Setting

  • 40

    3 Basic Operation

    • 40

      Basic Key Function
    • 42

      How to Use Factory Mode

  • 46

    4 Adjustment

    • 46

      Measuring Instruments, Jigs and Tools
    • 46

      Power-Supply Voltage
    • 46

      Power Circuit Closure
    • 46

      ADC Bias and Gain Adjust
    • 47

      Panel Brightness Check
    • 47

      Panel Color Check
    • 47

      Color Temperature Check

  • 48

    5 Reference Signal Timing

• 49

  Inspection

  • 51

    1 General Description

  • 52

    2 Electrical Characteristics

    • 52

      Input Signals
    • 54

      Power Supply
    • 55

      Power Management
    • 56

      Others
    • 57

      Touch Panel Capability
    • 57

      White Color Temperature
    • 58

      Visual Ergonomic Requirement of TCO'03 Standard
    • 58

      Criteria for Noise

  • 59

    3 Connector Pin Assignment

    • 59

      Analog Video Input: Mini D-SUB 15 Pin
    • 60

      Digital Inter Face Signals

  • 61

    4 Support Video Modes

  • 63

    6 Other Function

    • 63

      Full Scan Capacity
    • 64

      85Hz Refresh Rate Support

  • 63

    1100 DDC Function

    • 63

      Plug & Play
    • 63

      Remote Control

  • 65

    7 External Inspection on the LCD Module

    • 65

      Inspection Condition
    • 66

      Polarizer Defects
    • 67

      Foreign Material
    • 67

      Line Defect
    • 67

      Bezel Appearance
    • 67

      Others
    • 68

      Safety
    • 68

      Insulation Resistance Test
    • 68

      Dielectric Strength Test
    • 69

      Leakage Current Test
    • 69

      Ground Continuity
    • 69

      CTI Value of PCB
    • 69

      Others
    • 70

      System Connection
    • 71

      Input Signal
    • 71

      Program
    • 72

      Operation
    • 77

      EDID Data File
    • 77

      EDID Write Protect Cancel Signal Timing

  • 78

    Appendix Reference Signal Timings

• 92

  Trouble Shooting

  • 93

    1 No Display on Screen (Screen Is Black, Color of LED Is Amber)

  • 94

    2 Nothing Display on Screen (Screen Is Black, Color of LED Is Blue)

  • 96

    3 Checking the Back Light Unit

  • 97

    4 Abnormal Screen

  • 98

    5 Abnormal OSM Display

    • 98

      OSD Adjust Problem

  • 99

    6 Abnormal Plug and Play Operation

    • 99

      Abnormal DDC2 (D-Sub)
    • 99

      Abnormal DDC2 (DVI)

  • 100

    7 Checking the Interface Circuit of Sync Signal

    • 100

      Checking the Control Circuit of Horizontal Sync Pulse
    • 100

      Checking the Control Circuit of Vertical Sync Pulse

  • 101

    8 Checking the Resolution Change IC Movement

  • 102

    9 Checking the DC/DC Converter Circuit

  • 103

    10 No Power on

  • 104

    11 Check the USB Hub Circuit

    • 104

      HUB Is Not Recongnize
    • 105

      Connection Apparatus Is Not Recognize
    • 106

      Connection Apparatus Does Not Work
    • 107

      Check the USB IC

• 108

  Circuit Description

  • 109

    E 2 Prom
  • 109

    E 2 PROM for EDID
  • 109

    Interface Board and Panel Power Supply
  • 109

    System Reset, LED Control Circuit
  • 109

    Video Input Circuit
  • 110

    MCU Circuit
  • 113

    Power Supply (Circuit Daigrams MAIN PWB)
  • 115

    USB 2.0 Hub Circuit