ViewSonic VT2645-M Service Manual
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ViewSonic VT2645-M Service Manual

26” lcd tv
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Service Manual
ViewSonic VT2645-M
Model No. VS12675
26" LCD TV
(VT2645-M_SM Rev. 1b Apr. 2010)
®
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1 Service Manual ViewSonic VT2645-M Model No. VS12675 26” LCD TV (VT2645-M_SM Rev. 1b Apr. 2010) ® ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...
  • Page 2 Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

  • Page 3: Table Of Contents

    3. Function Description 4. Block Diagram 5. Exploded Diagram and Exploded Parts List 6. Disassembly Procedure 7. Recommended Spare Parts List 8. BIOS /Firmware Update SOP 9. Trouble Shooting Flow Chart 10. FAQ ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    Safety Operate the TV on 100V and 120V AC only. Use the AC power cord specified by ViewSonic and suitable for the voltage where you use it. The plug is designed, for safety purposes, to fit into the wall outlet only one way.
  • Page 5 When carrying the TV, do not subject it to shocks, vibration, or excessive force. When lifting or moving the TV, hold it securely from the bottom. Place your palm directly under the panel. Installed on the wall Installed with stand ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 6 The type of programming and signal provided by your cable service provider will affect the availability of digital cable television programming in your area. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 7: Product Specification

    Power ON/OFF button Turn the power on from standby mode or turn the power off to return to the standby mode. SOURCE Select input source. MENU Turn OSD menu ON/OFF. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 8 YPbPr Connect to an external device, such as a VCR, STB, or a DVD player. Coaxial Connect to a digital audio receiver supporting the S/PDIF standard, such as a home theater receiver. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 9 YPbPr Press to select source to YPbPr mode. Press to select source to AV or S-Video mode. Press to turn Closed Caption On/Off Press to activate Multichannel Television Sound, Stereo or Mono. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 10 There are several times for choice – Off, 15 Min, 30 Min, 45 Min, 60 Min, 75 Min, 90 Min, 105 Min, and 120 Min. PICTURE Press to adjust Picture mode. WIDE Press to select Video Display format. SOUND Press to adjust Sound mode. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 11: Function Description

    3.1.6 Press MENU to exit the menu. 3.2 OSD Settings 3.2.1Video Settings Brightness Controls the overall brightness of the picture. Contrast Controls the difference between the brightest and darkest regions of the picture. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 12 Tint Controls the difference between the green and red regions of the picture. Backlight Dark Room Medium Room Bright Room. Color Temperature Warm Cool Neutral Memory Recall Resets all settings of Video. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 13 Adjusts the relative volume of the speakers in a multiple speaker system. TV Speaker Audio mode Rock Classical Flat Audio Only Turns off video and gives out audio only. Press any key to show video. Memory Recall Resets all settings of Audio. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 14 Channel Skip List Clear List Channel Name Edit Channel Edit Channel Name Edit Allows you to assign a name to a channel. Mono Mono Audio Language English French Spanish Auto Scan Cable ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 15 Analog Type Digital Type Font Size Font Color Background Color Parental Control Enter Password Setup Settings Rating Select ON/OFF to activate/deactivate the Rating programs. Block Unrated TV-Y (TV Rating) MPAA (MPAA Rating) ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 16 3.2.6 How to get into the factory mode and Hospitality mode Factory model: Enter OSD "Setting" -> "Version" -> press arrow UP + "-" + ENTER+ENTER Carnival (Hospitality) model: Pressing "Menu" and then "9876" key. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 17: Block Diagram

    4. Block Diagram ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 18: Exploded Diagram And Exploded Parts List

    5. Exploded Diagram and Exploded Parts List ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 19 EXPLODED PARTS LIST ( VT2645-M ) ViewSonic Model Number: VS12675 Rev: 1A Item ViewSonic P/N Ref. P/N Description Q'ty 13EB-07B0201 B09 26 REAR COVER MO C-00009759 13EB-11B0211 EB11 26 BUTTON BEZEL MO 13EB-11B0101 EB11 26 FRONT COVER MO C-00009758 C-00009761...
  • Page 20 PACKING PART LIST ( VT2645-M ) ViewSonic Model Number: VS12675 Rev: Item ViewSonic P/N Ref. P/N Description Q'ty STAND Power Cable Remote control 1506-09L9000 Quick Start Guide BAG DC-00009821 1506-09UF000 Quick Start Guide DC-00009822 1506-0B5D000 User Guide P-00009734 1505-00YB000 EPS CUSHION VT3745-M(TR)

  • Page 21: Disassembly Procedure

    The disassembly procedure consists of the following steps: Base Rear Cover Bracket Keypad Cable Mainboard IR Board Speaker Panel Base 1. Remove 4 screws (M4*15L W) that fixing the base with the rear cover. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 22 2. Remove screw (M4*10L S) to take the base module apart. BASE SUPPORT BASE Rear Cover 1. Remove 2 screws (M3*10L B) and 5 screws (M3*8L X) that fixing on the rear cover. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 23 2. Remove 4 screws (M3*10L B) that fixing on the rear cover. 3. Remove 4 screws (M3*14L B) that fixing on the rear cover. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 24 4. Remove the rear cover. Bracket 1. Remove 2 screws (M3*10L B), 2 screws (M3*8L X) and 4 screws (M3*8L B) that fixing on the I/O bracket. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 25 2. Remove 2 screws (M3*6L WS) that fixing the I/O bracket with the panel. 3. Remove 4 screws (M3*6L WS) that fixing the left and right bracket cable clamps. 4. Remove 7 screws (M4*6 K) that fixing the bracket and chassis. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 26 6. Remove 2 screws (M4*8LX) that fixing the chassis with the panel. 7. Remove the chassis. Keypad 1. Remove 2 screws (M3*8L B) that fixing the keypad module with front cover module. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 27 2. Disconnect IR-Keypad wire from keypad. 3. Remove 3 screws (M3*8L B) to take the keypad module apart. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 28 4. Disconnect Keypad-MB wire from Keypad. Cable 1. Disconnect Keypad-MB wire from mainboard. 2. Disconnect the PSU-MB cable. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 29 3. Disconnect speaker cable 4. Disconnect the LVDS cable from panel. 5. Open the cover of the LVDS connector on the Mainboard. 6. Insert the LVDS cable. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 30 7. Close the cover of the LVDS connector. Mainboard Remove 4 screws (M3*6L WS) that fixing on the Mainboard. 1. Remove screw (M4*6L W) that fixing the grounding wire with panel. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 31 2. Disconnect cables from PSU 3. Remove 4 screws (M3*6L WS) that fixing the PSU. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 32 IR Board 1. Disconnect the IR wire from IR board. 2. Remove 2 screws (M3*8L B) that fixing the IR board. Speaker Remove 4 screws (M3*8L*9D) that fixing the speakers on front cover. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 33 Panel 1. Remove 2screws (M3*8L*9D X) that fixing the panel 2. Remove the panel from front cover. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 34: Recommended Spare Parts List

    Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of Notice: 1. For some special parts, some photos for identification purpose may be asked by request 2.

  • Page 35: Bios /Firmware Update Sop

    Step2: Use PC to obtain FIRMWARE.PKG from WebService. Put “FIRMWARE.PKG” file onto “C:\Temp”. Step3: Plug USB flash disk to PC. Select USB disk in “My Computer”. Select “Properties” item below to see USB file system format. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 36 Make sure FAT32 format in USB Copy “C:\Temp\FIRMWARE.PKG” to the ROOT directory of USB disk. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 37 Plug the USB disk to the HDTV (power off) Step5: Power on HDTV Power on HDTV. It will show upgrading progresses automatically within 3 seconds. The HDTV screen will show red and blue progress bar several times. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 38 Remove the USB flash disk from HDTV. 8.2 How to format to FAT32 Plug USB flash disk to PC. In “My Computer” folder, Select “Format…” function in the pop-up menu. Select FAT32, then press “Start”. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 39 8.3 Supported USB flash disks SanDisk Kingston KingMax 8.4 RMA test procedure Install factory tool 8.4.1 Install visa450runtime 8.4.2 Finish Install. 8.4.3 Connect the USB cable between PC and PWR meter ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 40 8.4.4 Restart the PC, the device can be found on the control panel. 8.4.5 Install the factory tool for repair. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 41 Finish installing under installation guide. 8.4.6 Run the factory tool. 8.4.7 When Login every initial screen, it should key in the user name and ISN number. Key in the job number、password, and log in. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 42 Input serial number of TV. 8.4.8 Test1 station, Initialize ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 43 USB to RS232 cable+RS232 cable on TV. Connect the other end of the RS232 cable with PC. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 44 Choose T1. Press auto run. Press “No” to go the Test 2 station. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 45 8.4.9 Test 2 Station, Backlight and Gamma alignment. Rear view of Color analyzer. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 46 Choose T2. Choose the type of color analyzer, then press”AUTO RUN” If you do not need to test next one, press “No” to go to T3 station. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 47 8.4.10 T3 station, Color temperature check. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 48 Choose type of Color analyzer&Patterngenerator Press ”AUTO RUN” ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 49 Check Gamma_6500 Check Gamma_9300 ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 50 Check Gamma_11000 Turn off the power. Check the power consumption should<1w ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 51 If not test the next one, press “No” to go to T4 station. 8.4.11 T4 Station, EDID writing ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 52 Go to the T4 station, press “Start”. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 53 It will show “All pass” when the work finished. 8.4.12 T5, SN writing ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 54 ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 55 Go to the T4 station, press ”Start”. If the connection is all right, it will show green check mark. Input the SN number of TV. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 56 Press Enter, if it works normally will show ”All Pass”. 8.4.13 Check SN number ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 57 8.4.13.2 Check by Patten generator Make sure to follow below process: Turn on the TV. Connect TV with Chromma22293 VGA and HDMI. Switch TV source to VGA or HDMI Set Chroma 22293 Timing:14 Pattern:701(VGA) Timing:70 Pattern:701(HDMI) ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 58: Trouble Shooting Flow Chart

    9. Trouble Shooting Flow Chart 9.1 No Power 9.2 Can not start ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 59 9.3 No display 9.4 Abnormal display ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 60 9.5 No sound ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 61 9.6 Key Board ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

  • Page 62: Faq

    • Check your audio settings, your TV audio may be set to minimum. • Press the Volume + (Up) button on the remote control. Remote control unit does not operate • Make sure the directions of batteries are inserted ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 63 Please set the AIR/CABLE option to CABLE referring to the user guide. • CATV is connected improperly or not connected; please check all the CATV connections. • The cable TV service is interrupted; please contact your cable operator. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...
  • Page 64 C. Do you have any other opinions or suggestions regarding this service manual? Reader’s basic dada: Name: Title: Company: Add: Tel: Fax: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. ViewSonic Corporation VT2645-M Confidential - Do Not Copy...

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