ViewSonic VG2427wm Service Manual
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ViewSonic VG2427wm Service Manual

ViewSonic VG2427wm Service Manual

23.6” color tft lcd display
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Service Manual

ViewSonic VG2427wm
Model No. VSXXXXX
23.6" Color TFT LCD Display
(VG2427wm_SM Rev. 1a Mar. 2009)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VG2427wm

  • Page 1: Service Manual

    Service Manual ViewSonic VG2427wm Model No. VSXXXXX 23.6” Color TFT LCD Display (VG2427wm_SM Rev. 1a Mar. 2009) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: Revision History

    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

    TABLE OF CONTENTS 1. Precautions and Safety Notices ..................4 2. Specification ........................7 3. Front Panel Function Control Description ............... 8 4. Circuit Description ......................13 5. Adjusting Procedure ......................24 6. Trouble Shooting Flow Chart .................... 32 7. Block Diagrams ........................ 33 8.

  • Page 4: Precautions And Safety Notices

    1. Precautions and Safety Notices 1. Precautions and Safety Notices 1.1 Safety Precautions This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS before installing and keep this guide handy.
  • Page 5 1.4 Handing and Placing Methods Correct Methods: Incorrect Methods: Only touch the metal frame of the LCD panel or the Surface of the LCD panel is pressed by fingers and that front cover of the monitor. Do not touch the surface of may cause “Mura.”...
  • Page 6 Placing the monitor on foreign objects. That could Place the monitor on a clean and soft foam pad. scratch the surface of the panel or cause “Mura.” Place the monitor on the lap, the panel surface must The panel is placed facedown on the lap. That may be upwards.

  • Page 7: Specification

    2. Specification...

  • Page 8: Front Panel Function Control Description

    3. Front Panel Function Control Description Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls”.
  • Page 9 Do the following to adjust the display setting: 1. To display the Main Menu, press button [1]. NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu. 2.

  • Page 10: Main Menu Controls

    Main Menu Controls Adjust the menu items shown below by using the up and down buttons. Control Explanation Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video cards.
  • Page 11 Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).
  • Page 12 Language Select allows the user to choose the language used in the menus and control screens. Resolution Notice advises the optimal resolution to use. OSD Position allows the user to move the OSD menus and control screens. OSD Timeout sets the length of time the OSD screen is displayed. For example, with a “15 second”...

  • Page 13: Circuit Description

    4. Circuit Description 4.1 Main Board U401 NT68667UFG/C The NT68667 is a highly integrated flat panel display controller that interfaces analog, digital, and video inputs. It combines a triple ADC, a DVI compliant TMDS receiver, a digital YUV receiver, a high quality zoom and shrink engine , a multi-color on screen display (OSD) controller , an advanced color engine , and many other functions in a single chip.
  • Page 14 Pin Assignment...
  • Page 18 U701 AP1117D33L and U704 AP1117E18LA: DC power convert, convert to 3.3v and 1.8v. AP1117 is a low dropout positive adjustable or fixed-mode regulator with 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply.
  • Page 19 Pin Descriptions Name Pin # Function A resistor divider from this pin to the Vout pin and ground sets the output voltage. Adj (GND) (Ground only for Fixed-Mode) The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ESR ≤20Ω) Vout must be connected from this pin to ground to insure stability.

  • Page 20: Power Board

    4.2 Power Board IC901 LD7576 The LD7576X series bring high performance, combines with highly integrated functions, protections and EMI-improve solution. It’s an ideal solution for those cost-sensitive system, reducing component count and overall system cost. The LD7576X series features near-lossless high voltage startup circuit, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation.
  • Page 21 Block Diagram Name Function This pin is to program the frequency of the low frequency timer. By connecting a capacitor to ground to set the OLP delay time. And this pin can be used for latch mode protection. By pulling this pin lower than 0.8 V, the controller will be entered latch mode until the AC power-on recycling.
  • Page 22 IC801 TA9687GN 9687 is a high performance, cost-effective CCFL (Cold Cathode Fluorescent Lamp) controller designed for driving large-size Liquid Crystal Display (LCD) applications requiring 2 to 6 CCFLs. The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage and current waveforms. 9687 supports full-bridge power conversion topologies while maintaining high-efficiency operation.
  • Page 23 Pin Description Pin No. I/O1 Names Description VSEN Voltage Sense Feedback SSTCMP Capacitor for Soft-Start and Loop Compensation Timing Resistor and Capacitor for Operation and Striking Frequency Timing Resistor for Striking Frequency GNDA Signal Ground PDR2 High Side Driver Output 2 GNDP Power Ground NDR2...

  • Page 24: Adjusting Procedure

    5. Adjustment Procedure 5.1 White balance, Luminance adjustment Approximately 2 Hours should be allowed for warm up before proceeding White-Balance adjustment. Before started adjust white balance, please setting the Chroma-C7120 MEM. Channel 0 to9300 K colors, MEM. Channel 1 to 7500 K colors, MEM.

  • Page 25: Firmware Upgrade Procedure

    e. Adjust sRGB (sRGB) color-temperature 1. Switch the Chroma-C7120 to RGB-mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 4 (with up or down arrow on Chroma-C7120) 3.The LCD-indicator on Minolta-CA210 will show x = 313 ±12, y = 329 ±12, Y = 80 ±15 cd/m 10.
  • Page 26 LPT Cable VGA Cable Hardware Connect status 5.2.2 Update the NOVATEK’S firmware You should jump the pin to “For Flash” at ISP Board Connect to the PC LPT Connect to the VSC VA2427wm...
  • Page 27 Double click “Writer.exe” This tool can auto detect the right SCALAR programe speed,the process as follow:...
  • Page 28 When auto detect is finished,click “Load Hex”,then chosse the firmware that you want to update Click “Auto”,then the update will begin.Wait for a moment until the bar is 100%,the program windows will show “Programing Success”.This means the update is successful.

  • Page 29: Ddc Key In Procedure

    5.3 DDC Key in Procedure Note: 1. Every time after replacing the main board, you have to do the DDC key in. 2. If you find the DDC does not conform to the LCD TV, you have to do the DDC key in. 5.3.1 Equipment Needed VG2427wm PC (Personal computer)
  • Page 30 For analog a. Double-click ，appear as follow Figs： b. Click c. Key in the Serial Number printed on the barcode label, then click “OK”...
  • Page 31 R3V080100001 12 codes, for example. d. Unit appears the following Fig, writer completed.

  • Page 32: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart...

  • Page 33: Block Diagrams

    7. Block Diagram 7.1 Main Board LCD Interface (CN302) EEPROM Crystal Scalar IC NT68667 12MHz PM25LV020-100SCE (Include MCU, ADC, OSD) (X401) (U402) (U401) DVI_SCL DVI_SCL DVI_SDA DVI_SDA Key Control interface (CN404) EEPROM EEPROM M24C02 M24C02 (U102) (U108) H sync D-DATA V sync D-CLK D-Sub...
  • Page 34 7.2 Power Board AC input Bridge Rectifier Transformer Rectifier diodes EMI filter and Filter Start Circuit: R904, R905,R906 CN902 Feedback PWM Control Circuit IC LD7576 ON/OFF Output Transformer MOSFET Circuit ON/OFF Lamp Control Feedback PWM Control Circuit Over Voltage...

  • Page 35: Schematic Diagrams

    8. Schematic Diagrams 8.1 Main Board FB102 R102: 100 Ohm->0 Ohm VGA_B+ R102 R105 100R 1/16W 5% C102 DSUB_B+ 5 0R05 1/10W 5% BEAD 0.047uF H_Sy nc R103 100R 1/16W 5% DSUB_H 5 V_Sy nc R104 R108 C105 DSUB_V 5 100R 1/16W 5% 5pF/50V 5VCC...
  • Page 36 CN302 CN301 LVB0M RXO0- LVB0P RXO0+ PANEL_VCC LVB0M RXO0- RXO0+ LVB0P LVB1M RXO1- FB301 LVB1M RXO1- RXO1+ LVB1P LVB1P RXO1+ LVB2M RXO2- RXO2+ LVB2P LVB2M RXO2- LVBCKM RXOC- RXOC+ LVBCKP LVB2P RXO2+ LVB3M RXO3- RXO3+ LVB3P LVA0M RXE0- RXE0+ LVA0P LVBCKM RXOC- 120 OHM...
  • Page 37 5VCC CN701 5VCC R701 NC/10K 1/16W 5% BKLT-VBRI BKLT-EN R710 PANEL_ID# 5 R703 0R05 1/16W Volume# 5 R707 0R05 1/16W Mute 5 U704 AP1117E18LA SOT223 C703 CONN C701 C710 C712 NC/0.1UF 16V NC/1N 50V lock type NC/1uF/16V U702 VCC1.8 TO252 NC/AIC1117A-18PE VCC3.3 Vout...
  • Page 38 DVDD DVDD FB403 C401 R414 C411 U402 VCC1.8 CVDD 300OHM 0.22uF16V R440 R441 NC/0.22uF16V FB401 FB406 SPI_CE NC/4K7 1/16W 5% NC/4K7 1/16W 5% U403 AVCC PVCC 300 OHM 300OHM SPI_SO HOLD# R409 100R 1/16W 5% SPI_CK SPI_SI EE_WP C406 C407 C442 R413 MSCL...
  • Page 39 8.2 Power Board L904 100 OHM 1/4W R918 +16V 100 OHM 1/4W R919 Coil C912 BD901 0.001uF GBU408 100 OHM 1/4W R920 ZD902 C918 TZX18B D906 C917 FB902 80OHM FMX-12SL 680uF25V 680uF25V Q903 T901 KTD1028 R943 POWER X'FMR 470R 1/8W 5% R904 C905 C938...
  • Page 40 R817 4R7 1/8W +16V Q805 ZD802 ON/OFF RLZ5.6B ZD803 RLZ5.6B R816 4R7 1/8W CN801 R803 R804 PT801 AO4620 5K1 1/8W 5% 5K1 1/8W 5% POWER X'FMR C819 56pF3KV C815 0.1uF R819 Q806 CN802 C802 4R7 1/8W CONN 0.047uF C820 R802 56pF3KV 22R 1/8W 5% L801...
  • Page 41 +5V1 +5V1 R602 C604 100uF/25V 10K 1/10W 5% R603 10K 1/10W 5% C609 1uF/25V 10K 1/10W 5% R609 IC601 CN602 LOUT+ SE/BTL LOUT- CN601 VOLUME LOUT- R604 10K 1/10W 5% C601 0.47uF/16V LIN- LOUT+ ROUT- C606 0.47uF/16V RIN- ROUT+ BY PASS ROUT+ R605 10K 1/10W 5%...
  • Page 42 8.3 Key Board KEY 1 R001 3K 1/10W 1% KEY 2 DOWN R002 3K 1/10W 1% POWER Y ELLOW BLUE R003 2K OHM 1% 1/10W R004 2K OHM 1% 1/10W LED001 SW01 C001 C002 0.1uF 16V 0.1uF 16V KEY1 POWER CN001 KEY2 DOWN...
  • Page 43 8.3 USB Board VBUS0 VBUS0 USB5V R702 0R05 1/16W USB5V CN701 U701 USB2514-AEZG CONNNECTOR Upstream L701 NC USBUP_DM R701 F703 VBUS_DET 100K 1/16W 5% ZD701 ZD702 F701 NC/PTCR FB703 NC/120 OHM USBUP_DP C701 PTCR FB701 120 OHM 1uF/16V R703 0R05 1/16W R704 Dow nstream 1 R728...

  • Page 44: Pcb Layout Diagrams

    9. PCB Layout Diagrams 9.1 Main Board...
  • Page 46 9.2 Power Board...
  • Page 48 9.3 Key Board 9.3 USB Board...

  • Page 50: Exploded Diagram And Spare Parts List

    10. Exploded Diagram and Exploded Parts List 10.1 EPL...
  • Page 51 Item Description Part Number Q'ty BEZEL A34G0935 KRB1B0130 LENS A33G0529 1 1L0100 KEY PCB KEPC8AA9 KEY PAD A33G0528 AS 1L0100 PANEL 750GLM236H1111N0VS POWER BOARD PWPC9D41MQWU MAIN BOARD-CBPCRNDVSQ1 756GQ8CB VV071 SPEAKERS 078G 311 20 G MAIN FRAME A15G0489301 SHIELD-AC A85G0133101 REAR COVER A34G0936 KR 3B0100 HINGE COVER A33G0669 KR 1L0100...
  • Page 52 10.2 PPL Item Description Part Number Q'ty Signal cable 089G 728CAA DB Audio cable 089G 17356X553 DVI cable 089G1748HAA AC Power cable 089G402A18N IS EPS(top) Q44GD020101 LCD Monitor Manual Q70G2401709 3A EPS(bottom) Q44GD020201 Carton Q44GD020709 1A...

  • Page 53: Recommended Spare Parts List

    11. Recommended Spare Parts List TDRMNDDKWBVSPC Location Part Number Description Remark 019G6014 1 TIE FOR STRAP 023G3178709 3A LOGO 041G 68508 A CONTROL CARD 050G 600 1 W WHITE STRAP 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1185 24 VSC TAPE 052G 1186...
  • Page 54 A34G0936 KR 3B0100 REAR COVER 23.6" A85G0133101 SHIELD-AC AM1G1740 12225 CR3 SCREW 040G 45762412B CBPC LABEL CN701 033G3802 9B Y WAFER CN404 033G8019 6C CONN.6P 1.0 DIP CN302 033G8027 30 WAFER 30P 2.0MM DIP DUAL ROW CN101 088G 35315F XH D-SUB 15PIN VERTICAL CONN WITH SCREW CN102 088G 35424F XH...
  • Page 55 R105 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R109 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R111 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R113 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R119 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R404 061G0402101 RST CHIPR 100 OHM +-5% 1/16W...
  • Page 56 R401 061G0402470 0F RST CHIPR 0402 470 OHM +-1% 1/16W R110 061G0402471 RST CHIPR 470 OHM +-5% 1/16W R303 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R138 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R137 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R136 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W...
  • Page 57 C302 065G0402224 17 CAP CER 0.22UF -20%-80% C401 065G0402224 17 CAP CER 0.22UF -20%-80% C102 065G0402473 12 CHIP 0.047UF 16V X7R C106 065G0402473 12 CHIP 0.047UF 16V X7R C108 065G0402473 12 CHIP 0.047UF 16V X7R C110 065G0402473 12 CHIP 0.047UF 16V X7R C111 065G0402473 12 CHIP 0.047UF 16V X7R...
  • Page 58 ZD401 093G 39S 34 T UDZSNP5.6B ROHM ZD402 093G 39S 34 T UDZSNP5.6B ROHM ZD403 093G 39S 34 T UDZSNP5.6B ROHM D102 093G 64 42 PP BAV70 SOT-23 D103 093G 64 42 PP BAV70 SOT-23 R148 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R149 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W...
  • Page 59 CN801 033G8021 2E F WAFER IC903 056G 139 3A IC PC123Y22FZ0F IC601 056G 616 34 IC APA2069JITUL 2.6W*2 PDIP-16 NR901 061G 58809MEN RST NTCR 8OHM £«£20£¥ 4A XIANZHENG C904 063G107K224 UM X2 CAP 0.22UF K 275VAC C819 065G 3J5606ET CAP CER 56PF J 3KV C820 065G 3J5606ET CAP CER 56PF J 3KV...
  • Page 60 0M1G 930 8120 SCREW Q90G6263 6 HEAT SINK 705GQ893039 D908 ASS'Y D908 093G 60278 DIODE SP1060 ITO-220 SECOS 0M1G 930 8120 SCREW Q90G6263 6 HEAT SINK 705GQ893040 D906 ASS'Y D906 093G 52 66 DIODE FMX-12SL 10A/200V TO-220 0M1G 930 8120 SCREW Q90G6264 5 HEAT SINK...
  • Page 61 R840 061G0603105 RST CHIPR 1M OHM +-5% 1/10W R841 061G0603105 RST CHIPR 1M OHM +-5% 1/10W R930 061G0603243 1F RST CHIPR 2.43K OHM +-1% 1/10W R927 061G0603360 1F RST CHIPR 3.6K OHM +-1% 1/10W R808 061G0603390 0F RST CHIPR 390 OHM +-1% 1/10W R845 061G0603512 RST CHIPR 5.1 KOHM +-5% 1/10W...
  • Page 62 R935 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R920 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R919 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R918 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R912 061G1206221 RST CHIPR 220 OHM +-5% 1/4W R909 061G1206339 RST CHIPR 3.3 OHM +-5% 1/4W...
  • Page 63 C929 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R C912 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R FB902 071G 57G800 B CHIP BEAD HCB3216KF-800T30 BULLWILL D806 093G 64 42 P BAV70 SOT23 BY PAN JIT D807 093G 64 42 P BAV70 SOT23 BY PAN JIT D808 093G 64 42 P...
  • Page 64 Q37G0139013 VSC 23.6 HINGE ASS'Y Q40G 58170931A HT POT LABEL Q40G0001624 4A PALLET LABEL Q40G000270927A EPA LABEL Q44G6002123 93 PAPER BOARD Q44G6002CP1A27 PAPER CAP Q44G9003220 CORNER PAPER Q44GD020101 Q44GD020201 Q44GD020709 1A 23 LCD CARTON Q45G 77 5 PE PACKING Q45G 88609120 EPE BAG Q50G 4 10...
  • Page 65 R718 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R719 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R720 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R724 061G0402105 RST CHIPR 1MOHM +-5% 1/16W R709 061G0402153 RST CHIP 15K 1/16W 5% R726 061G0402153 RST CHIP 15K 1/16W 5% R721 061G0603120 2F...

  • Page 66: Different Parts List

    E08904 089G 17356X553 AUDIO CABLE Q41G2401709 3A VA2413WM SERVICE INSERT Q41G2401709 7A VG2427WM QSG FOR LI Q45G2007M0102A PE BAG FOR MANUAL Q70G2401709 3A VG2427WM CD MANUAL 040G 581 26704 SHIPPING LABEL 040G 58162435A P/N LABEL FOR MANUAL PE BAG Q40G 24N709 2A RATING LABEL Q40G 581709 1B CARTON LABEL...
  • Page 67 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. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com)

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