BenQ G900WA Service Manual
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BenQ G900WA Service Manual

19” lcd color monitor
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See also: User Manual
19" LCD Color Monitor
1. About This Manual......................................................................................................................................................... 2  
2. Introduction................................................................................................................................................................... 3  
2.1 RoHS requirement ...........................................................................................................................................................3  
2.2 Safety Notice.....................................................................................................................................................................3  
2.3 General Description .........................................................................................................................................................4  
2.4 Related service information ............................................................................................................................................4  
3. Product Overview........................................................................................................................................................... 6  
3.1 Monitor Specifications .....................................................................................................................................................6  
3.2 Input Signal Connector....................................................................................................................................................7  
3.3 Factory Preset Display Modes .......................................................................................................................................7  
3.4 Panel Specification...........................................................................................................................................................8  
4 Disassembly /Assembly ................................................................................................................................................. 13  
4.1 Three angles' view .........................................................................................................................................................13  
4.2 Exploded View ................................................................................................................................................................14  
4.3 Disassembly .......................................................................................................................................................................15  
5.Cosmetic / Appearance / Alignment Service......................................................................................................... 19  
5.1 Software/Firmware Upgrade Process................................................................................................................................19  
5.2 Adjustment / Alignment Procedure
5.3 White‐Balance, Luminance Adjustment.............................................................................................................................31 
6 Circuit Board and Standard Parts Replacement .............................................................................................................. 33  
6.1 Electrical Block Diagram
6.2 Troubleshooting Guide.......................................................................................................................................................35 
6.3 Circuit operation theory.....................................................................................................................................................42 
6.4 BOM List
............................................................................................................................................................................44 

Content Index

...................................................................................................................................22 
....................................................................................................................................................33 
1
BenQ G900WA

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  • Page 1 19” LCD Color Monitor BenQ G900WA Content Index 1. About This Manual................................. 2   2. Introduction................................... 3   2.1 RoHS requirement ................................3   2.2 Safety Notice..................................3   2.3 General Description .................................4   2.4 Related service information ............................4   3. Product Overview................................6   3.1 Monitor Specifications ..............................6  ...

  • Page 2: About This Manual

    Service Manual that provide repair engineer various choice. If you have any questions, please contact with the engineers of TPV customer service. COLOR MONITOR MODEL ID G900WA (EU) 1st Edition July 2007...

  • Page 3: Introduction

    19” LCD Color Monitor BenQ G900WA 2. Introduction 2.1 RoHS requirement Overview -Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive 2002/95/EC is published in the Official Journal 13 February 2003 (OJ L37, 13.2.2003, p.19).

  • Page 4: General Description

    This operating manual contains important information you require to start up and run your LCD monitor. A graphics card (screen controller) with VGA interface is required to control the BenQ G900WA LCD monitor. The monitor processes the data supplied to it by the screen controller. The screen controller or the associated driver software is responsible for setting the modes (resolution and refresh rate).
  • Page 5 19” LCD Color Monitor BenQ G900WA • The wall socket shall be installed near the equipment and shall be easily accessible. • For use only with the attached power adapter (Output 12Vdc) which have UL,CSA listed license(Only for monitors with power adapter).

  • Page 6: Product Overview

    19” LCD Color Monitor BenQ G900WA 3. Product Overview 3.1 Monitor Specifications Driving system TFT Color LCD Size 48cm(19") Pixel pitch 0.285mm(H) × 0.285mm(V) 160, 160 (CR>10) LCD Panel Viewable angle Contrast 800:1 300 cd/m2 Brightness Response time 5ms(typical) Video R, G, B Analog Interface Separate Sync.

  • Page 7: Input Signal Connector

    19” LCD Color Monitor BenQ G900WA 3.2 Input Signal Connector Pin No. Description Pin No. Description Green Detect Cable Blue Ground Ground DDC-Serial Data VGA_CON H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground 3.3 Factory Preset Display Modes...

  • Page 8: Panel Specification

    19” LCD Color Monitor BenQ G900WA 3.4 Panel Specification M190A1-L07 OVERVIEW M190A1-L07 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The inverter module for Backlight is not built in.
  • Page 9 19” LCD Color Monitor BenQ G900WA Optical Characteristics...
  • Page 10 19” LCD Color Monitor BenQ G900WA LTM190M2-L31 OVERVIEW LTM190M2-L31 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT(Thin Film Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light unit.
  • Page 11 19” LCD Color Monitor BenQ G900WA Electrical Characteristics...
  • Page 12 19” LCD Color Monitor BenQ G900WA Optical Characteristics...

  • Page 13: Disassembly /Assembly

    19” LCD Color Monitor BenQ G900WA 4 Disassembly /Assembly 4.1 Three angles’ view...

  • Page 14: Exploded View

    19” LCD Color Monitor BenQ G900WA 4.2 Exploded View...

  • Page 15: Disassembly

    19” LCD Color Monitor BenQ G900WA 4.3 Disassembly Note: Only the monitor G900W has both D-SUB and DVI connectors. The Monitor G900WA dose not have DVI Connector. 1). Back View as Fig1 Place the monitor face down on a smooth surface as Fig 1. Be careful to avoid scratch and injury during the uninstall.
  • Page 16 19” LCD Color Monitor BenQ G900WA The arrows in blue are the hook that we should put attention to when remove the rear cover. Use plastic putty knife to release the 6 hooks on the bottom,6 hooks on the top,5 hooks on the left,5 hooks on the right and remove the only one screw in red as Fig3 on the rear cover , then you can easily remove the rear cover and bezel.
  • Page 17 19” LCD Color Monitor BenQ G900WA 4).Remove the Panel Remove the 4 screws on the side of main frame first, and then disconnect the Lamp Connections and LVDS Cable connection. SCREWS LVDS CABLE Lamp Connection...
  • Page 18 19” LCD Color Monitor BenQ G900WA 5).Remove the Main Board and Power Board Remove the screws in red and disconnect the all connections, at last you can get the Main Board and Power Board as follow.

  • Page 19: Cosmetic / Appearance / Alignment Service

    19” LCD Color Monitor BenQ G900WA 5. Cosmetic / Appearance / Alignment Service 5.1 Software/Firmware Upgrade Process Note: here we will take a AOC monitor for example. 1) Connect the ISP board as follow: 2) Double-click ，running the program as follows:...
  • Page 20 19” LCD Color Monitor BenQ G900WA 3) Click the icon, when the screen as shown below appears, please click the icon to load the software program. If there are two programs please select the option of “Both”, or select “Main”.
  • Page 21 19” LCD Color Monitor BenQ G900WA 4) Until appears the follow Fig, writer completed.

  • Page 22: Adjustment / Alignment Procedure

    19” LCD Color Monitor BenQ G900WA 5.2 Adjustment / Alignment Procedure Adjusting the Picture You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor. Press the MENU key to display the following main OSD menu.
  • Page 23 19” LCD Color Monitor BenQ G900WA Display menu 1. Press the MENU key to display the main menu. 2. Press the (left) or (right) keys to select DISPLAY and then press the ENTER key to enter the menu. 3. Press the...
  • Page 24 19” LCD Color Monitor BenQ G900WA Picture menu 1. Press the MENU key to display the main menu. 2. Press the (left) or (right) keys to select PICTURE and then press the ENTER key to enter the menu. 3. Press the...
  • Page 25 19” LCD Color Monitor BenQ G900WA Color - Press ENTER to enter the Color menu. Allows video and still photographs Normal 0 to 100 to be viewed with natural coloring. This is the factory default color. Press the (left) Applies a cool tint to the image and...
  • Page 26 19” LCD Color Monitor BenQ G900WA Picture Advanced menu 1. Press the MENU key to display the main menu. 2. Press the (left) or (right) keys to select PICTURE ADVANCED and then press the ENTER key to enter the menu.
  • Page 27 19” LCD Color Monitor BenQ G900WA Item Function Operation Range Selects a picture mode that best suits the type of images shown on the screen. • Standard - for basic PC application. Press the (left) • Movie - for viewing videos.
  • Page 28 19” LCD Color Monitor BenQ G900WA System menu 1. Press the MENU key to display the main menu. 2. Press the (left) or (right) keys to select SYSTEM and then press the ENTER key to enter the menu. 3. Press the...
  • Page 29 19” LCD Color Monitor BenQ G900WA region. Chinese • Serbo-Croatian • Romanian • Dutch • Russian • Swedish • Portuguese H. Position Adjusts the horizontal 0 to 100 position of the OSD menu. V. Position Adjusts the vertical 0 to 100...
  • Page 30 19” LCD Color Monitor BenQ G900WA be accessible. Press MENU to leave the OSD Settings menu. Press the ENTER key to select this Allows the monitor option. Press the • ON DDC/CI* settings to be set through • OFF the software on the PC.

  • Page 31: White‐Balance, Luminance Adjustment

    = 313 ±30, y = 329 ±30, Y≥200±20cd/m 3. Into Factory mode of BENQ G900WA: Turn off the monitor, keep pressing the ENTER button, and turn on the monitor , then when we press the AUTO button, the factory OSD will be at the left top of the panel.
  • Page 32 19” LCD Color Monitor BenQ G900WA 5. Adjust the GREEN of color3 on factory window until chroma 7120 indicator reachedthe value G=100 6. Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100 7. Repeat above procedure (item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2 C.

  • Page 33: Circuit Board And Standard Parts Replacement

    19” LCD Color Monitor BenQ G900WA 6 Circuit Board and Standard Parts Replacement 6.1 Electrical Block Diagram Main Board Crystal LCD Interface (X401) (CN601) Scalar IC RTD2025L RTD 2120L (Include ADC, OSD) (U401) (U501) EPR_SDA EPR_SCL H sync Key Board...
  • Page 34 19” LCD Color Monitor BenQ G900WA Inverter/Power Board 5V Rectifier and Filter Transformer Bridge Rectifier and T901 14V Rectifier EMI filter Filter and Filter Start Circuit: R904，R932，R933 CN902 Feedback Over PWM Control IC Voltage Circuit IC TEA1530 Protect ON/OFF MOSFET...

  • Page 35: Troubleshooting Guide

    19” LCD Color Monitor BenQ G900WA 6.2 Troubleshooting Guide Equipments and Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with and Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.
  • Page 36 19” LCD Color Monitor BenQ G900WA Main Board (1) No Power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the power section Measure U201 Pin2=3.3V...
  • Page 37 19” LCD Color Monitor BenQ G900WA (2) No picture No picture Measure U201 PIN2=3.3V Replace U201 X401 oscillate waveforms are normal Replace X401 Check U401 Replace U401 Check if the sync signal from computer is output and video cable is connected normally...
  • Page 38 19” LCD Color Monitor BenQ G900WA (3) White screen White Screen Measure Q602 base X401 oscillate is low level? waveform is normal Replace X401 Check Q602, Q601 is broken Check U401 or CN601 solder? Replace U401 Check Correspondent Check reset circuit of component.
  • Page 39 19” LCD Color Monitor BenQ G900WA Power/Inverter Board No power Check CN902 pin4, 5 = 14V Check AC line volt 110V or 220V Check AC input Check the voltage of C905(+) Check bridge rectified circuit and F901 circut Check start voltage for the pin8 of IC901...
  • Page 40 19” LCD Color Monitor BenQ G900WA W / LED, No Backlight Check CN902 pin4, 5 = 14V Check the adapter and F801 Check ON/OFF signal and the pin 12 of IC801 is 14V Check main board or change ON/OFF signal...
  • Page 41 19” LCD Color Monitor BenQ G900WA Keypad Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Is Key Pad Board normally? Replace Key Pad Board...

  • Page 42: Circuit Operation Theory

    19” LCD Color Monitor BenQ G900WA 6.3 Circuit operation theory...
  • Page 43 19” LCD Color Monitor BenQ G900WA 1) MCU initializes. 2) Is the EPROM blank? 3) Program the EPROM by default values. 4) Get the PWM value of brightness from EPROM. 5) Is the power key pressed? 6) Clear all global flags.

  • Page 44: Bom List

    19” LCD Color Monitor BenQ G900WA 6.4 BOM List T97MRDDBTWBQNN Location TPV Part No. Description 007G 7 L106 COMPOUND PALLET 007G 7 L107 COMPOUND PALLET 044G6002120106 PAPER BOARD 044G600270010A PAPER BOARD 044G9003214 CORNER PAPER 050G 600 2 HANDLE1 050G 600 3...
  • Page 45 19” LCD Color Monitor BenQ G900WA CN202 033G3802 6 WAFER CN201 033G3802 9 WAFER 9P RIGHT ANELE PITCH CN601 033G8027 24 H CONN W TO B12P*2 P*2.0 4505-2 040G 457624 1B LABEL-CPU 040G 45762412B CBPC LABEL R507 061G152M339 64 CHIPR 3.3 OHM +-5% 2W...
  • Page 46 19” LCD Color Monitor BenQ G900WA R409 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R410 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R454 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R453 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R424 061G0402102...
  • Page 47 19” LCD Color Monitor BenQ G900WA R414 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R604 061G0402473 RST CHIPR 47 KOHM +-5% 1/16W R415 061G0402682 RST CHIP 6K8 1/16W 5% R431 061G0402682 RST CHIP 6K8 1/16W 5% R439 061G0402682 RST CHIP 6K8 1/16W 5%...
  • Page 48 19” LCD Color Monitor BenQ G900WA C310 065G0402509 31 CHIP 5PF 50V NPO FB201 071G 56K121 M CHIP BEAD FB502 071G 56K121 M CHIP BEAD FB503 071G 56K121 M CHIP BEAD FB601 071G 56K121 M CHIP BEAD FB301 071G 59K190 B...
  • Page 49 19” LCD Color Monitor BenQ G900WA C008 065G0603104 32 CHIP 0.1UF 50V X7R C007 065G0603104 32 CHIP 0.1UF 50V X7R 715G2695 1 KEY BOARD PCB PWPC942HU2P POWER BOARD CN801 033G8021 2E F WAFER CN802 033G8021 2E F WAFER CN803 033G8021 2E F...
  • Page 50 19” LCD Color Monitor BenQ G900WA AM1G1730 8120 GP SCREW 705G 193 93 01 D906 ASS'Y D906 093G 60218 SB10100FCT AM1G1730 8120 GP SCREW Q90G6274 2 HEAT SINK IC801 056G 379 22 IC TL494IDR SOIC-16 IC901 056G 379 71 IC TEA1530AT SO-8 PHILIPS...
  • Page 51 19” LCD Color Monitor BenQ G900WA R813 061G0603100 2F RST CHIPR 10 KOHM +-1% 1/10W R808 061G0603100 2F RST CHIPR 10 KOHM +-1% 1/10W R803 061G0603105 RST CHIPR 1 MOHM +-5% 1/10W R835 061G0603105 RST CHIPR 1 MOHM +-5% 1/10W...
  • Page 52 19” LCD Color Monitor BenQ G900WA R967 061G1206000 RST CHIPR 0 OHM +-5% 1/4W JR901 061G1206000 RST CHIPR 0 OHM +-5% 1/4W JR809 061G1206000 RST CHIPR 0 OHM +-5% 1/4W JR808 061G1206000 RST CHIPR 0 OHM +-5% 1/4W JR807 061G1206000...
  • Page 53 19” LCD Color Monitor BenQ G900WA C910 065G0805102 32 CHIP 1000P 50VX7R 0805 C805 065G0805104 32 CHIP 0.1U 50V X7R C824 065G0805104 32 CHIP 0.1U 50V X7R C907 065G0805104 32 CHIP 0.1U 50V X7R C916 065G0805104 32 CHIP 0.1U 50V X7R...
  • Page 54 Q45G 88606 R PE BAG FOR BASE Q45G 88609 87 EPE COVER FOR MONITOR Q50G 600 B 1 BENQ STRAP Q52G 1185 79 MIDDLE TAPE FOR BENQ CARTON Q52G 1185 87 BENQ TAPE FOR PALLET 040G 58162435A LABEL Q41G7800881 4A SERVICE INFORMATION(4J.L2R05.001) Q41G7800881 6A QSG(4J.0C401.001)
  • Page 55 19” LCD Color Monitor BenQ G900WA Diversity of T97SRDDBTWBQNN compared with T97MRDDBTWBQNN Location TPV Part No. Description 052G 1211 A 165MINIUM TAPE 705GQ734331 19" LCD BEZEL ASS'Y A34G0455ADDA1B0130 BEZEL(L19W-7BENQ) 705GQ734332 19" LCD REAR COVER ASS'Y A34G0451ADP 4B0130 REAR COVER(L19W-7BENQ) 750GLS90M3152N...
  • Page 56 19” LCD Color Monitor BenQ G900WA R815 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R814 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R801 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R802 061G0603180 2F RST CHIPR 18 KOHM +-1% 1/10W...
  • Page 57 19” LCD Color Monitor BenQ G900WA U401 056G1125701 X(WBQRWR9SRQ6) IC MCU RTD2120L-LF REALTEK R313 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R309 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R306 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R315 061G0402101 RST CHIPR 100 OHM +-5% 1/16W...
  • Page 58 19” LCD Color Monitor BenQ G900WA (4J.06K02.003)WARRANTY CARD FOR Q41G780088117A CHINA Q70G9002881 3A CD MANUAL(5B.0C401.003-DCR)

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