Logik LCX27WN2 Service Information
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Logik LCX27WN2 Service Information

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LCX27WN2
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Summary of Contents for Logik LCX27WN2

  • Page 1 LOGIK LCX27WN2 Service information...
  • Page 2 Nexgen Mediatech Inc. LCD TV Maintance Manual Hand book Approved by: Title: Level 1 Service Manual Prepared by: Alex Chen Doc. No. Preparation Date Model Version Page 2003/11/13 27” V1.0 1 OF 31 Version Date of new version Contents (Revision) V1.0 2003.11.13 New release (new product)

  • Page 3: Table Of Contents

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 2/30 Table of content 1.Electric Specifications 2.Interface 3.System Block 4.Description of Level 1 Service Tools 5.Defect mode, Possible causes and Solution for End-Users 6.Exploded view Diagram 7.Disassembly/Assembly tools and procedure 8.Troubleshooting Analysis 9.Upgrade System Bios 10.Defect code, Possible Cause and Changed Parts Summary...

  • Page 4: Electric Specifications

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 3/30 27” LCD TV Service Manual Electric Specifications...
  • Page 5 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 4/30 VGA Supported Timing Vertical Horizontal Sync Resolution Dot Clock Standards Scanning Scanning Polarity or Operating Note Item Frequency Frequency composite Mode (MHz) (Hz) (KHz) sync (H/V) NEC PC98 640x350 25.175 70.00 31.50...

  • Page 6: Interface

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 5/30 2. Interface 2.1 VGA Interface Function Signal Impedance Level 0. 7V 75 Ohms Green 0.7V 75 Ohms Blue 0. 7V 75 Ohms Reserved Ground Red Ground Green Ground Blue Ground +5V DC Sync.
  • Page 7 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 6/30 2.3 YPbPr 2.4 C Interface omposite 2.5 TV RF Interface...

  • Page 8: System Block

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 7/30 3. System Block Diagram LCD Panel Inverter LCD Panel Interface Audio Processor & Amplifier SDRAM Controller DC/DC Converter TV Module Interface A/D Converter Video Decoder Graphic Interface Audio & Power Interface Speaker-R OSD Keypad &...

  • Page 9: Defect Mode, Possible Causes And Solution For End-Users

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 8/30 5. Defect mode, Possible causes and Solution for End-Users Defect Mode Possible causes Solution 1.No picture 1.Did you connect power supply core? 1.Is the screen in power saving mode? 2.Did you turn on the power? 2.Turn on power supply.

  • Page 10: Exploded View Diagram

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 9/30 6. Exploded view Diagram...

  • Page 11: Disassembly/Assembly Tools And Procedure

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 10/30 7.Disassembly/Assembly tools and procedure for 27” Tools 1. 27” 2. Back view 3. Lateral view 5. Release 6 screws as arrow...
  • Page 12 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 11/30 6. Appearance of stand 7. Release 8 screws as arrows 8. Take of tuner box and AV box 9. Take off adaptor 10. AV box 11. Tuner Box...
  • Page 13 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 12/30 12. Release 15 screws as arrows 13. Take off wall mount bracket 14. Wall mount bracket 15. Loosen 8 screws on the speaker boxes. 16. Speaker boxes 17. Loosen 3 screws and take off speaker cable.
  • Page 14 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 13/30 18. Take off 4 screws and the pc panel bracket. 19. PC panel bracket. 20. Take off pc panel bracket. 21. Loosen 8 screws on main board. 22. Disconnect 8 cables and take off 23.
  • Page 15 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 14/30 24. Take off Key pad set. 25. Release 2 screws on key pad. 26. Key pad board. 27. Loosen 2 screws on IR board. 28. Loosen 10 screws and separate front 29.
  • Page 16 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 15/30 29-1 29-2 29-3 29-4 29-5 29-6...

  • Page 17: Troubleshooting Analysis

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 16/30 8.Troubleshooting Analysis Defect Mode Failure Analysis Repair Testing Missing Line Check PCB AD/B Change Light On Test Check Panel Panel Change Bright Dot Abnormal Display Dark Dot Backlight Light Leakage Mura Check Panel Panel Change...

  • Page 18: Failure Analysis

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 17/30 Defect Mode Failure Analysis Repair Testing Flicker Check PCB AD/B Change Image is Inverter Change too dark Gray value Check PCB AD/B Change display Panel Change Check Panel R. G. B Check PCB AD/B Change display...
  • Page 19 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 18/30 Defect Mode Failure Analysis Repair Testing ON/OFF Abnormal No Power Check PCB AD/B Change Keypad/B Change Check FFC FCC Change AD/B Change LED off display Check PCB abnormal LED Dark Keypad/B Change LED Abnormal Check FFC...
  • Page 20 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 19/30 Defect Mode Failure Analysis Repair Testing Other Display flicker Abnormal Check PCB AD/B Change (tapping ) Display Check Panel Inverter Change Cannot use Check keypad board Keypad Change remote control Remote Control or Check remote Battery Change...
  • Page 21 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 20/30 Defect Mode Failure Analysis Repair Testing Audio Sound adjust Abnormal Check PCB AD/B Change abnormal No sound Check Speaker Speaker Change Check FCC FCC Change Single sound Check PCB AD/B Change Keypad/B Change Hear phone...
  • Page 22 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 21/30 Defect Mode Failure Analysis Repair Testing AV , SV , CV Video Check PCB AD/B Change No Image Abnormal ( AV , SV , CV , TV ) Check Cable Cable Change TV No Image Check PCB...
  • Page 23 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 22/30 Defect Mode Failure Analysis Repair Testing Abnormal Can’t Upgrade BIOS Check PCB AD/B Change BIOS Upgrade TEST Completed...

  • Page 24: Upgrade System Bios

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 23/30 9 . Upgrade System Bios Explanation of Programmable ISP (In System Program) Use designed ISP tool to upgrade system BIOS. To press Ch- and Ch+ on key pad simultaneously, to get into factory mode, to choose ISP item then change 0 to 1 by vol. Pad.
  • Page 25 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 24/30 9.5 Execute ispwriter.exe file To execute 8051IspWriter.exe file on your PC and the screen below appears. 9.6 Move the cursor to click “Select Chip” button and select the type of CPU(W78E65). 9.7 Move the cursor to click “Select Bank0”...
  • Page 26 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 25/30 9.8 Select the Port name on Communication setting screen. 9.9 Move the cursor to click “Connect” button to link. If the linking succeeds, it will show “Connected” on Communication Setting screen.
  • Page 27 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 26/30 9.10 Click “Program All” button to execute erase and write function. After execution screen below will appear. Click “confirm” button to finish the execution. 9.11 To click “verify” button to execute verify function. After verification screen below will appear.

  • Page 28: Defect Code, Possible Cause And Changed Parts Summary

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 27/30 10.Defect code, Possible Cause and Changed Parts summary Items Defect mode Code Possible Cause and Changed Parts No power Power cord/adaptor, power supply, Keypad board, main board No picture Is on power saving mode? Each input signal is abnormal? Missing line Main board, panel, panel-MB cable...

  • Page 29: Test Patterns And Check Points

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 28/30 11.Test patterns and check points 1 Dot on/off SMPTE RP133 16 Gray scale *Check if Clock & Phase is *Check if vertical line and horizontal *Check the amplitude of RF signal distorted.

  • Page 30: Remark

    Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 29/30 12.Remark (SPARE PARTS LIST) Material Item S/N Item Key parts 180-270001-101 PANEL LCD 27" WXGA 1280*720 185-115001-101 ADAPTER 150W 12V PCBA 196-270001-101 NLC27C1 INVERTER VER5.0 510-271003-011 NLC27C1 MAIN BOARD PCBA VER.1 510-272002-011 PCBA NLC27C1 IR BOARD 510-272003-011...
  • Page 31 Nexgen Mediatech Inc. Level 1 Service Manual TITLE VER. PAGE 30/30 200-270014-0101 NLC27C1 SPEAK BOX 200-270015-0101 NLC27C1 FUNCTION PANEL 200-270017-0101 NLC27C1 STAND FRAME PLATE 210-270007-011 NLC27C1 PC NAME PLATE 250-270007-011 NLC27C1 MAIN COVER BRACKET 250-270008-011 NLC27C1 PANEL BRACKET 250-270009-011 NLC27C1 PC PANEL BRACKET 250-270010-011 NLC27C1 SPEAKER NET 250-270011-011...

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