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BenQ G920HDA Service Manual

18.5” lcd color monitor
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See also: User Manual
Applicable Country & Regions: Europe/China
Service Manual for BenQ:
LCD G920HDA
(D-SUB+ Black Bezel)
Product Service Manual – Level 1~2
Notice:
For RO to input specific "Legal Requirement" in specific NS regarding to responsibility and
liability statements.
Please check BenQ's eSupport web site, http://esupport.benq.com, to ensure that you have the
most recent version of this manual.
First Edition (January, 2009)
©
Copyright BenQ Corporation 2009. All Right Reserved.
Version: 1st
Date:01-13-2009
1

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Summary of Contents for BenQ G920HDA

  • Page 1 Notice: For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and liability statements. Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the most recent version of this manual. First Edition (January, 2009) ©...

  • Page 2: Table Of Contents

    18.5” LCD Color Monitor BenQ G920HDA Content Index Abbreviations & Acronyms ............................3 1. About This Manual ..............................5 1.1 Important ................................5 1.2 Trademark................................5 2. Introduction ................................5 2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS............. 5 2.2 Safety Notice ..............................

  • Page 3: Abbreviations & Acronyms

    18.5” LCD Color Monitor BenQ G920HDA Abbreviations & Acronyms Analogue to Digital Converter Automatic Frequency Control: control signal used to tune to the correct frequency BenQ Corporation BenQ Broadcast Television System Committee BTSC Central Process Unit Composite Video Blanking and Synchronisation CVBS Digital Light Processing / Texas Instruments®...
  • Page 4 18.5” LCD Color Monitor BenQ G920HDA Personal Computer Printed Circuit Board (or PWB) Remote Control transmitter Red, Green, and Blue. The primary colour signals for TV. By mixing levels of R, G, and B, all colours (Y/C) are Read Only Memory...

  • Page 5: About This Manual

    Service Manual that provide repair engineer various choice. 1.1 Important Only trained service personnel who are familiar with this BenQ Product shall perform service or maintenance to it. Before performing any maintenance or service, the engineer MUST read the “Important Safety Information”.

  • Page 6: Safety Notice

    Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your local Laser Safety Compliance Requirements. 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ G920HDA offers numerous features and functions, for example: ● TFT display (Thin Film Transistor; active matrix) ●...

  • Page 7: Related Service Information

    18.5” LCD Color Monitor BenQ G920HDA ● high resolution (1920x1080) ● presentation of up to 16.7 million colours (in conjunction with an appropriate graphics card) ● automatic scanning of horizontal frequencies from 30 to 63 kHz and refresh rates (vertical frequencies) from 50 to 76 Hz (absolutely flicker-free) ●...

  • Page 8: Product Overview

    18.5” LCD Color Monitor BenQ G920HDA Service Web Site eSupport URL:http://esupport.benq.com 5. Product Overview 5.1 Monitor Specifications Driving system TFT Color LCD Size 470mm(18.5") Pixel pitch 300（per one triad）X300 Display Area 409.8 x 230.4 170/160， （CR≧10） Viewable angle LCD Panel...

  • Page 9: Packing

    18.5” LCD Color Monitor BenQ G920HDA 5.2 Packing When packing the monitor into the carton, please follow the pictures as below. Using the EPE bag to pack the monitor without base. Using the EPE bag to pack the base...
  • Page 10 18.5” LCD Color Monitor BenQ G920HDA Using the EPS to pack the monitor Putting the base and user manual in the position as the picture shows above.
  • Page 11 18.5” LCD Color Monitor BenQ G920HDA Power cord User manual Putting the monitor and accessories into the carton.

  • Page 12: Level 1 Cosmetic / Appearance / Alignment Service

    18.5” LCD Color Monitor BenQ G920HDA Level 1 Cosmetic / Appearance / Alignment Service Visual Inspection & Cleaning • Cleaning. Always unplug your monitor from the wall outlet before cleaning. Clean the LCD monitor surface with a lint-free, non-abrasive cloth. Avoid using any liquid, aerosol or glass cleaners.
  • Page 13 18.5” LCD Color Monitor BenQ G920HDA Connect to Connect to the the PC LPT BenQ model 4. The process of ISP write is as follows. ，running the program as follows: a. Double-click...
  • Page 14 18.5” LCD Color Monitor BenQ G920HDA b. Choose , click ,, running the program as follows: c. Click icon, search the program” BenQ_G920HDA_RTD2525LH_AUO185_DCR_V100.H00”, and click open: d. Click icon, search the program” BenQ_G920HDA_RTD2525LH_AUO185_DCR_V100.H01”, and click open: e. Click icon, search the program” BenQ_G920HDA_RTD2525LH_AUO185_DCR_V100_EXTEND”,...
  • Page 15 18.5” LCD Color Monitor BenQ G920HDA f. Click icon, until appear the follow Fig, writer completed...

  • Page 16: Adjustment / Alignment Procedure

    18.5” LCD Color Monitor BenQ G920HDA 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 17 18.5” LCD Color Monitor BenQ G920HDA Display menu 1. Press the MENU key to display the main menu. 2. Press the keys to select DISPLAY and then press the ENTER key to enter the menu. 3. Press the keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 18 18.5” LCD Color Monitor BenQ G920HDA frequency timing to synchronize with the analog input video signal. Not applicable to a digital input signal. Phase Adjusts the pixel clock 0 to 63 phase timing to synchronize with the analog input video signal.
  • Page 19 18.5” LCD Color Monitor BenQ G920HDA Adjusts the degree of difference between darkness and lightness. Press the key to increase the contrast and Contrast 0 to 100 The function is not available press the key to for use when Dynamic Contrast is decrease the contrast.
  • Page 20 18.5” LCD Color Monitor BenQ G920HDA Press MENU to leave the Color menu. The function will increase the level of contrast to provide sharper and Press the ENTER key to more detailed image quality. select this option. Press Dynamic Contrast...
  • Page 21 18.5” LCD Color Monitor BenQ G920HDA Item Function Operation Range Selects a picture mode that best suits the type of images shown on the screen. • Standard - for basic PC application. • Standard • Movie - for viewing videos.
  • Page 22 18.5” LCD Color Monitor BenQ G920HDA System menu 1. Press the MENU key to display the main menu. 2. Press the keys to select SYSTEM and then press the ENTER key to enter the menu. 3. Press the keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 23 18.5” LCD Color Monitor BenQ G920HDA displayed on your • Czech/ Traditional may differ from those Chinese shown on the right, • Hungarian/ depending on the Simplified product Chinese supplied in your • Serbo-Croatian region. • Romanian • Dutch • Russian •...
  • Page 24 18.5” LCD Color Monitor BenQ G920HDA use the keys to select "NO" in the "OSD Lock" submenu from "OSD Settings" menu, and all OSD controls will be accessible. Press MENU to leave the OSD Settings menu. Press the ENTER key to select this Allows the monitor option.
  • Page 25 18.5” LCD Color Monitor BenQ G920HDA Display timing table Horz-f Horz Vert-f Pixel Clk Pixel Format Vert -P Source 18.5”W (kHz) (Hz) (MHz) 640 x 350 31.47 70.09 25.18 ● 640 x 480 31.47 59.94 25.175 ● 640 x 480 37.5...
  • Page 26 6. The timer can only reset at the service mode by “ Timer Reset”. And need to have a warning message to double confirm the reset function.The timer should record up to 99999 hours 7. add BenQ logo on/off item, the default is “on” 8. add the auto power on item, the default is “off ”...
  • Page 27 18.5” LCD Color Monitor BenQ G920HDA...

  • Page 28: Level 2 Circuit Board And Standard Parts Replacement

    18.5” LCD Color Monitor BenQ G920HDA Level 2 Circuit Board and Standard Parts Replacement Product Exploded View PART NO UNIT DESCRIPTION Q34G0543ADPB1B0130 BEZEL Q33G0288 2 1C0100 LENS Q33G0287ADP 1L0100 KEYPAD Q15G0405101 MAINFRAME Q34G0544ADP 1B0130 REARCOVER Q33G0289ADPA1L0100 LOGO_COVER Q34G0545ADP 1B0130 STAND_FRONT...

  • Page 29: Six Angles' View

    18.5” LCD Color Monitor BenQ G920HDA CBPCRRPBFQA MAIN BOARD KEPC8QH6 KEY BOARD PWPC8521VYD5 POWE RBOARD Six angles’ view...

  • Page 30: Product Disassembly

    18.5” LCD Color Monitor BenQ G920HDA Product Disassembly 1). Remove the stand-base ASS’Y Place the monitor face down on a smooth surface. Be careful to avoid scratch and injury during the uninstall. And then remove the four screws as below to remove the stand-base ASS’Y.
  • Page 31 18.5” LCD Color Monitor BenQ G920HDA 2).Remove the rear cover 1. Work in the gap with your 2．Work in the gap with 3． Flip the monitor over and fingers along the sides of your fingers along the top make the panel screen face...
  • Page 32 18.5” LCD Color Monitor BenQ G920HDA 3).Remove the Bezel Remove the bezel as follow: Fig.3...
  • Page 33 18.5” LCD Color Monitor BenQ G920HDA 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.
  • Page 34 18.5” LCD Color Monitor BenQ G920HDA 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. MAIN BOARD POWER BOARD...

  • Page 35: Block Diagram

    18.5” LCD Color Monitor BenQ G920HDA Block Diagram Main Board Crystal Panel Interface 14.318MHz (CN603) (X401) MCU RTD2122L-LF Scalar RTD2035L (U401) (U501) H sync V sync D-Sub Connector Key Control Interface (CN301) (CN202)
  • Page 36 18.5” LCD Color Monitor BenQ G920HDA Power Board AC input Rectifier Bridge Rectifier Transformer EMI filter Diodes and Filter Start Circuit CN902 R904, R932 Over Voltage ON/OFF Control IC Protect Output MOSFET Q802 DC Convert Circuit Circuit Lamp ON/OFF Feedback...

  • Page 37: Schematic Diagram

    18.5” LCD Color Monitor BenQ G920HDA Schematic Diagram Main Board DSUB_V R302 0R05 1/16W R301 100R 1/16W RTD_H R303 100R 1/16W RTD_V ZD303 ZD302 R304 R305 C302 C303  2.2K 1/16W FB302 C304  2.2K 1/16W 22pF 22pF R306 100R 1/16W RLZ5.6B...
  • Page 38 18.5” LCD Color Monitor BenQ G920HDA CN201 CMVCC CMVCC MVCC FB202 CMVCC BKLT-VBRI DIM# BKLT-EN C_PANEL_INDEX CMVCC PANEL_ID# Volume# FB201 VCC3 Volume# U201 Mute Mute VOUT 120 CONN C202 C204 AP1117E33LA C205 C203 100UF25V 100UF25V 0.1uF/16V 0.1uF/16V Panel ID(3.3V PWM) Back light Dimming(3.3V PWM)
  • Page 39 18.5” LCD Color Monitor BenQ G920HDA DSUB_5V CMVCC '06-11-24 D402 change CMVCC Value from BAT54 to D401 BAV70 C402 D402 BAT54C(NC) BAV70 Reserve for powerBoard MCU_VCC Q401 CMVCC=3V PMBS3904 MCU_VCC_S MCU_VCC C404 R402 C412 R405 R406 R407 1K 1/16W R403 1uF 10V ...
  • Page 40 18.5” LCD Color Monitor BenQ G920HDA VCC3 FB502 120 C503 0.1uF/16V U501 1.8AVCC R1.8DVCC Q501 VCC3 MMBT2907AK Q502 V1/REXT TXO1-  R507 FB503 C507 C501 MMBT2907AK 120 C505 C506 V2/RX1P TXO1+ 0.1uF/16V 22UF50V 0.1uF/16V 0.1uF/16V V3/RX1N TXO2- V4/RX0P TXO2+ DGND...
  • Page 41 18.5” LCD Color Monitor BenQ G920HDA LVDS Panel ( Normal Type ) CN601 RXE0- RXE0+ RXE1- RXE1+ RXE2- RXE2+ RXEC- RXEC+ RXE3- RXE3+ LVDS_E[0..9] LVDS_E0 RXE0- LVDS_E1 RXE0+ LVDS_E2 RXE1- PANEL_VCC LVDS_E3 RXE1+ CONN LVDS_E4 RXE2- LVDS_E5 RXE2+ R602 R606...
  • Page 42 18.5” LCD Color Monitor BenQ G920HDA Power Board R918 100 OHM 1/4W L904 R919 +12V 1.0uH 100 OHM 1/4W C912 ZD902 0.001uF C930 RLZ13B R920 C922 R946 100 OHM 1/4W 470PF50V 150 OHM 2W 0.1uF C917 C918 680uF/25V 680uF/25V T901...
  • Page 43 18.5” LCD Color Monitor BenQ G920HDA CONN C839 T801 R821 1500PF/50V POWER X'FMR R817 1K 1/8W 10K 1/10W 1% CN801 R855 D805 15R 1/4W LL4148 C819 C801 F801 0.0022uF 30pF/3KV +12V 0 OHM 1/4W C802 R804 Q801 470PF50V C824 R856...
  • Page 44 18.5” LCD Color Monitor BenQ G920HDA Key Board LED_RED# LED_GRN# LED001 CN001 LBADC1 R003 1K 1/10W 1%  LBADC2 R002 1/10W DC_POWERON LED_GRN# LED_RED# R006 1K 1/10W 1%  R007 1/10W C001 C002 C003 C004 C005 NC/0.001uF NC/0.001uF NC/0.001uF NC/0.001uF NC/0.001uF...

  • Page 45: Troubleshooting Guide

    18.5” LCD Color Monitor BenQ G920HDA 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 46 18.5” LCD Color Monitor BenQ G920HDA 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...
  • Page 47 18.5” LCD Color Monitor BenQ G920HDA (2) No picture No picture Check if the Pin 3, 4 of CN201 are 5V input Check power board Measure U201 Pin2=3.3V Replace U201 X401 oscillate waveforms are normal Replace X401 Check U401 Replace U401...
  • Page 48 18.5” LCD Color Monitor BenQ G920HDA (3) White screen White Screen Measure Q601 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 49 18.5” LCD Color Monitor BenQ G920HDA Power Board No power Check CN902 PIN4.5 = 5V Check AC line volt 110V or 220V Check AC input Check the voltage of C907 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901...
  • Page 50 18.5” LCD Color Monitor BenQ G920HDA W / LED, No Backlight Check Inverter input =12V Check adapter and F801 Check ON/OFF signal Check Interface board or main board Check IC801 PIN 11=5V Change ON/OFF circuit Check IC801 PIN8/PIN9 PWM wave...
  • Page 51 18.5” LCD Color Monitor BenQ G920HDA 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 52: Pcb Layout

    18.5” LCD Color Monitor BenQ G920HDA PCB LAYOUT Main Board...
  • Page 53 18.5” LCD Color Monitor BenQ G920HDA Power Board...

  • Page 54: Appendix 1 - Screw List / Torque

    18.5” LCD Color Monitor BenQ G920HDA Appendix 1 – Screw List / Torque (T8RARPDBFWBUNN) Part No. Type Description Quantity Torque 0M1G 130 6120 M3*6 FOR MAIN FRAME & PANEL 3±0.5KGF. CM 0M1G1730 6120 M3*6 FOR ALL BOARDS & MAIN FRAME 6±1 KGF.

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