BenQ LCD G2020HDA Service Manual
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BenQ LCD G2020HDA Service Manual

D-sub+ black bezel
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See also: User Manual
Applicable Country & Regions: Europe
Service Manual for BenQ:
LCD G2020HDA
(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 (April, 2009)
©
Copyright BenQ Corporation 2009. All Right Reserved.
Version: 2nd
Date:09-03-2009
1

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Summary of Contents for BenQ LCD G2020HDA

  • 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 (April, 2009) ©...

  • Page 2: Table Of Contents

    20” LCD Color Monitor BenQ G2020HDA 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

    20” LCD Color Monitor BenQ G2020HDA Abbreviations & Acronyms Analog to Digital Converter Automatic Frequency Control: control signal used to tune to the correct frequency BenQ BenQ Corporation BTSC Broadcast Television System Committee Central Process Unit CVBS Composite Video Blanking and Synchronization Digital Light Processing / Texas Instruments®...
  • Page 4 20” LCD Color Monitor BenQ G2020HDA Not Connected Non Volatile Memory: IC containing TV related data (for example, options) On Screen Display Personal Computer Printed Circuit Board (or PWB) Remote Control transmitter Red, Green and Blue. The primary color signals for TV. By mixing levels of R, G...

  • 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

    20” LCD Color Monitor BenQ G2020HDA 2.2 Safety Notice Make sure your working environment is dry and clean, and meets all government safety requirements. Ensure that other persons are safe while you are servicing the product. DO NOT perform any action that may cause a hazard to the customer or make the product unsafe.

  • Page 7: General Description

    20” LCD Color Monitor BenQ G2020HDA 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ G2020HDA offers numerous features and functions, for example: ● TFT display (Thin Film Transistor; active matrix) ● minimal space requirements thanks to slim casing ●...

  • Page 8: Related Service Information

    This Service Manual contains general information. There are 2 levels of service: Level 1: Cosmetic / Appearance / Alignment Service Level 2: Circuit Board or Standard Parts Replacement Service Web Site eSupport URL: http://esupport.benq.com 5. Product Overview 5.1 Monitor Specifications G2020HDA...
  • Page 9 20” LCD Color Monitor BenQ G2020HDA Audio Speakers (built-in) PC Video Input D-Sub Input/Output Audio line in Earphone Jack Voltage Rating AC: 100~240V (Built-in) Power-On Mode Power Supply Standby Mode <1W Power Off Mode <0.5W Chassis Colors Glossy black Carton...

  • Page 10: Packing

    20” LCD Color Monitor BenQ G2020HDA 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 EPS to pack the monitor...
  • Page 11 20” LCD Color Monitor BenQ G2020HDA Putting the base and D-SUB cable in the position as the picture shows above. Power cord User manual Putting the monitor and accessories into the carton...

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

    20” LCD Color Monitor BenQ G2020HDA 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 20” LCD Color Monitor BenQ G2020HDA 4. The process of ISP write is as follows. a. Double-click ，running the program as follows: b. Choose , click , running the program as follows:...
  • Page 14 20” LCD Color Monitor BenQ G2020HDA c. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004.H00”, and click open: d. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004.H01”, and click open: e. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004_EXTEND”, and click open: f. Click icon, until appear the follow Fig, writer completed...

  • Page 15: Ddc Instruction

    20” LCD Color Monitor BenQ G2020HDA DDC instruction General DDC Data Re-programming In case the main EEPROM with Software DDC which store all factory settings were replaced because a defect repaired monitor’ the serial numbers have to be re-programmed. It is advised to re- soldered the main EEPROM with Software DDC from the old board onto the new board if circuit board have been replaced, in this case the DDC data does not need to be re-programmed.
  • Page 16 20” LCD Color Monitor BenQ G2020HDA 4. The process of ISP write is as follow: ，appear as follow: a. Double-click b. Choose “Analog ” and then click “Loadfile”, it will show the picture as follow:...
  • Page 17 20” LCD Color Monitor BenQ G2020HDA c. Click “OK”, it will show the picture as follow: d. Input the date in “Year-Month-Day” box, Key in the same 13 numbers in the Input SN and Verify SN, then click “Program”, when the analog DDC Write complete, it will show the picture as follow:...
  • Page 18 20” LCD Color Monitor BenQ G2020HDA G2020HDA EDID 128 bytes EDID Data (Hex): x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF 00 FF FF FF FF FF FF 00 09 D1 1E 78 45 54 00 00...
  • Page 19 20” LCD Color Monitor BenQ G2020HDA Composite Sync Support: Yes Sync. on green video supported:Yes Serration of the Vsync.Pulse is not required. Max. H. Image Size: 44cm. Max. V. Image Size: 25cm. Display Gamma: DPMS Features, Stand-by: No. DPMS Features, Suspend: DPMS Features, Active off: Yes.
  • Page 20 Detailed Timing: FD (Monitor limits) Min. V. rate: 50Hz Max. V. rate: 76Hz Min. H. rate: 24 KHz Max. H. rate: 83 KHz Max. Pixel Clock: 170MHz Detailed Timing: FC (Monitor Name) 'BenQ G2020HDA　　' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...

  • Page 21: Adjustment / Alignment Procedure

    20” LCD Color Monitor BenQ G2020HDA 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 22 20” LCD Color Monitor BenQ G2020HDA 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 23 20” LCD Color Monitor BenQ G2020HDA Item Function Operation Range Adjusts the balance between light and Press the key to increase dark shades. the brightness and press the Brightness key to decrease the brightness. 0 to 100 The function is not available for...
  • Page 24 20” LCD Color Monitor BenQ G2020HDA Press MENU to leave the Color menu. The function will increase the level of contrast to provide sharper and more detailed image quality. Dynamic Press the ENTER key to select this Contrast 0 to 5 option.
  • Page 25 20” LCD Color Monitor BenQ G2020HDA Displays the preview of screen images under Senseye Demo the selected mode from Press the (available when the Picture Mode. The screen will be divided into • ON keys to change the Picture Mode is set two windows;...
  • Page 26 20” LCD Color Monitor BenQ G2020HDA Item Function Operation Range Selects the D-sub (analog) input. Use this to change the input to that appropriate to your video Press the keys to change Input • D-sub cable connection type. the settings.
  • Page 27 20” LCD Color Monitor BenQ G2020HDA Press the keys to change the settings. To unlock the OSD controls when the OSD is preset to be locked, press and hold Prevents all the monitor settings the "MENU" key for 15 from being accidentally changed.
  • Page 28 20” LCD Color Monitor BenQ G2020HDA Display timing table Pixel Hor.-f(kHz) Hor. -p Ver.-f (Hz) Ver. -P Pixel Clk (MHz) Source Format 640 x 480 31.47 59.94 25.175 640 x 480 37.50 75.00 31.500 720 x 400 31.47 70.08 28.321 800 x 600 37.88...

  • Page 29: Factory Osd Menu

    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 30: Level 2 Circuit Board And Standard Parts Replacement

    20” LCD Color Monitor BenQ G2020HDA Level 2 Circuit Board and Standard Parts Replacement Product Exploded View PART NO UNIT DESCRIPTION REMARK Q23G3178881 1A LOGO A34G1308ADPB1B0130 BEZEL 20" Q33G0288 2 1C0100 LENS Q33G0287ADP 1L0100 KEYPAD KEPC8QJ4 KEY BOARD 750GLS200KT312N000 PANEL...

  • Page 31: Six Angles' View

    20” LCD Color Monitor BenQ G2020HDA A85G0174101 AC SHIELD P15G8299 3 BKT-VESA A34G1309ADP 2B0130 REAR COVER 20” Q33G0289ADPA1L0100 LOGO COVER Q34G0545ADP 1B0100 STAND FRONT AQ1G1740 12120 SCREW STAND & HINGE Q37G0125021 HINGE SCREW FOR GROUND 0M1G1740 8 47 CR3 STAND & HINGE...

  • Page 32: Product Disassembly

    20” LCD Color Monitor BenQ G2020HDA 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 process of uninstall. And then remove the two screws as below to remove the stand-base ASS’Y.
  • Page 33 20” LCD Color Monitor BenQ G2020HDA 3). Remove the rear cover 4).Remove the Panel Disconnect the Lamp Connections and LVDS Cable connection.
  • Page 34 20” LCD Color Monitor BenQ G2020HDA 5).Remove the Main Board and Power Board Remove the AC shielding, and remove the screws in red and disconnect the all connections in blue, at last you can get the Main Board and Power Board as follow.
  • Page 35 20” LCD Color Monitor BenQ G2020HDA MAIN BOARD POWER BOARD...

  • Page 36: Block Diagram

    20” LCD Color Monitor BenQ G2020HDA Block Diagram Main Board Crystal Panel Interface 24MHZ (CN601) (X401) MCU RTD2122L-LF Scalar RTD2045L-GR (U401) (U501) H sync V sync D-Sub Connector Key Control Interface (CN301) (CN202)
  • Page 37 20” LCD Color Monitor BenQ G2020HDA Power Board AC input Bridge Rectifier Rectifier diodes and Filter Transformer EMI filter Start Resistor R904, R932 Feedback Circuit PWM Control (IC901) Power Switch (Q901) Photocoupler (IC903) Output Circuit Transformer MOSFET (T801) (Q802) Lamp...

  • Page 38: Schematic Diagram

    20” LCD Color Monitor BenQ G2020HDA Schematic Diagram Main Board 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...
  • Page 39 20” LCD Color Monitor BenQ G2020HDA DSUB_V R301 100R 1/16W RTD_H R303 100R 1/16W RTD_V ZD303 ZD302 R304 R305 C302 C303 2.2K 　 1/16W 2.2K 　 1/16W FB302 C304 RLZ5.6B RLZ5.6B 22pF 22pF R306 100R 1/16W VGA_B+ RTD_B+ RTD_B+ BEAD...
  • Page 40 20” LCD Color Monitor BenQ G2020HDA DSUB_5V CMVCC CMVCC D401 C402 D402 MCU_VCC BAT54C(NC) BAV70 C404 MCU_VCC Reserve for powerBoard Q401 R405 R406 R407 CMVCC=3V PMBS3904 MCU_VCC_S U403 R402 C412 1K 1/16W R403 1uF 10V R408 3.9K 1/16W R409 IICSCL 　...
  • Page 41 20” LCD Color Monitor BenQ G2020HDA VCC3 FB502 120　 C503 0.1uF/16V U501 1.8AVCC R1.8DVCC Q501 VCC3 MMBT2907AK Q502 RXO1- V1/REXT TXO1- R507 　 FB503 C507 C501 MMBT2907AK 120　 C505 C506 RXO1+ V2/RX1P TXO1+ 0.1uF/16V 22UF50V 0.1uF/16V 0.1uF/16V RXO2- LVDS_O0 RXO0- LVDS_O[0..9]...
  • Page 42 20” LCD Color Monitor BenQ G2020HDA LVDS Panel ( Normal Type ) CN601 LVDS_O[0..9] LVDS_O0 RXO0- RXO0- RXO0+ LVDS_O1 RXO0+ RXO1- RXO1+ LVDS_O2 RXO1- RXO2- RXO2+ LVDS_O3 RXO1+ RXOC- RXOC+ LVDS_O4 RXO2- RXO3- RXO3+ LVDS_O5 RXO2+ RXE0- RXE0+ RXE1- RXE1+...
  • Page 43 20” LCD Color Monitor BenQ G2020HDA 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 44 20” LCD Color Monitor BenQ G2020HDA 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 45 20” LCD Color Monitor BenQ G2020HDA Key Board LED_RED# LED_GRN# LED001 LED001 CN001 CN001 CONN CONN LBADC1 R003 R003 1K 1/10W 1% 1K 1/10W 1% LBADC2 R002 R002 1/10W 1/10W DC_POWERON LED_GRN# LED_RED# R006 R006 1K 1/10W 1% 1K 1/10W 1%...

  • Page 46: Troubleshooting Guide

    20” LCD Color Monitor BenQ G2020HDA 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. Frequently asked questions (FAQ) The image is blurred: Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct resolution, refresh rate and make adjustments based on these instructions.
  • Page 47 20” LCD Color Monitor BenQ G2020HDA Faint shadow from the static image displayed is visible on the screen: • Activate the power management function to let your computer and monitor go into a low power "sleep" mode when not actively in use.
  • Page 48 20” LCD Color Monitor BenQ G2020HDA 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 49 20” LCD Color Monitor BenQ G2020HDA (2) No picture No picture Check if the Pin 3, 4 of CN201 is 5V input Check power board Measure U201 Pin2=3.3V Replace U201 X401 oscillate waveforms are normal Replace X401 Check U401 Replace U401...
  • Page 50 20” LCD Color Monitor BenQ G2020HDA (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 51 20” LCD Color Monitor BenQ G2020HDA 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 52 20” LCD Color Monitor BenQ G2020HDA 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 53 20” LCD Color Monitor BenQ G2020HDA Key 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 54: Pcb Layout

    20” LCD Color Monitor BenQ G2020HDA PCB LAYOUT Main Board...
  • Page 55 20” LCD Color Monitor BenQ G2020HDA Power Board...

  • Page 56: Appendix 1 - Screw List / Torque

    20” LCD Color Monitor BenQ G2020HDA Appendix 1 – Screw List / Torque (TA9SRKMBFWBQNN) Part No. Type Description Quantity Torque 0M1G1030 6120 M3*6 FOR POWER BOARDS & MAIN FRAME 6±1KGF.CM 0M1G1030 6120 M3*6 FOR MAIN BOARDS & MAIN FRAME 6±1KGF.CM...

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