BenQ G2320HDB Service Manual
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BenQ G2320HDB Service Manual

D-sub +dvi +black bezel
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See also: User Manual
Applicable Country & Regions: China
Service Manual for BenQ:
LCD G2320HDB
(D-SUB +DVI +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: 1st
Date:04-16-2009
1

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Summary of Contents for BenQ G2320HDB

  • 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

    23” LCD Color Monitor BenQ G2320HDB Content Index Abbreviations & Acronyms............................3 1. About this Manual..............................5 1.1 Important ................................5 1.2 Trademark ................................5 2. Introduction ................................6 2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.............6 2.2 Safety Notice ..............................6 2.3 Compliance Statement ............................6 3.

  • Page 3: Abbreviations & Acronyms

    23” LCD Color Monitor BenQ G2320HDB 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 23” LCD Color Monitor BenQ G2320HDB 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: Introduction

    23” LCD Color Monitor BenQ G2320HDB 2. Introduction This section contains general service information, please read through carefully. It should be stored for easy access place. 2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS. The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a legal requirement by EU (European Union) for the global electronics industry which sold in EU and some counties also require this requirement.

  • Page 7: General Description

    23” LCD Color Monitor BenQ G2320HDB 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ G2320HDB 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

    23” LCD Color Monitor BenQ G2320HDB 4. 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...
  • Page 9 23” LCD Color Monitor BenQ G2320HDB 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 Black Carton Brown Carton with at least C flute Power LED...

  • Page 10: Packing

    23” LCD Color Monitor BenQ G2320HDB 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 23” LCD Color Monitor BenQ G2320HDB D-SUB cable Base Putting the base, user manual and D-SUB cable in the position as the picture shows above User manual Power cord Putting the monitor and accessories into the carton...

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

    23” LCD Color Monitor BenQ G2320HDB 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 23” LCD Color Monitor BenQ G2320HDB 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 23” LCD Color Monitor BenQ G2320HDB c. Click icon, search the program” BenQ_G2320HDB_2555LH_SEC.H00”, and click open: d. Click icon, search the program” BenQ_G2320HDB_2555LH_SEC.H01”, and click open: e. Click icon, search the program” BenQ_G2320HDB_2555LH_SEC_EXTEND”, and click open: f. Click icon, until appear the follow Fig, writer completed...

  • Page 15: Ddc Instruction

    23” LCD Color Monitor BenQ G2320HDB DDC Instruction General DDC Data Re-programming In case the main EEPROM with Software DDC which store all factory settings were replaced for 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 23” LCD Color Monitor BenQ G2320HDB 3 The process of ISP write is as follow: a. Double-click ，appear as follow: b. Choose “Analog” and then click “Loadfile\lcdddc\B\BENQ\23BNQ\G2320HDB”, it will show the picture as follow: (Note: When you write digital EDID, choose the “DVI”)
  • Page 17 23” LCD Color Monitor BenQ G2320HDB 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: Note: The way of digital DDC Write is the same as analog.
  • Page 18 23” LCD Color Monitor BenQ G2320HDB G2320HDB EDID Analog 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 28 78 45 54 00 00...
  • Page 19 23” LCD Color Monitor BenQ G2320HDB Separate Sync Support: Composite Sync Support: Yes Sync. on green video supported:Yes Serration of the Vsync.Pulse is not required. Max. H. Image Size : 51cm. Max. V. Image Size : 29cm. Display Gamma: DPMS Features, Stand-by: No.
  • Page 20 Detailed Timing: FD (Monitor limits) Min. V. rate: 50Hz Max. V. rate: 76Hz Min. H. rate: 24KHz Max. H. rate: 83KHz Max. Pixel Clock: 210MHz Detailed Timing: FC (Monitor Name) 'BENQ G2320HDB Detailed Timing: FF (Monitor SN) '15467890321' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...
  • Page 21 23” LCD Color Monitor BenQ G2320HDB Digital 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 29 78 45 54 00 00...
  • Page 22 23” LCD Color Monitor BenQ G2320HDB DPMS Features, Stand-by: No. DPMS Features, Suspend: DPMS Features, Active off: Yes. Display Type: R.G.B color display. Standard Default Color Space: Primary color space. Preferred Timing Mode: In First Detailed Timing. GTF supported: No.
  • Page 23 Detailed Timing: FD (Monitor limits) Min. V. rate: 50Hz Max. V. rate: 76Hz Min. H. rate: 24KHz Max. H. rate: 83KHz Max. Pixel Clock: 210MHz Detailed Timing: FC (Monitor Name) 'BENQ G2320HDB' Detailed Timing: FF (Monitor SN) '15468970321' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...

  • Page 24: Adjustment / Alignment Procedure

    23” LCD Color Monitor BenQ G2320HDB 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 25 23” LCD Color Monitor BenQ G2320HDB 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 26 23” LCD Color Monitor BenQ G2320HDB Item Function Operation Range Adjusts the balance between light Press the key to increase and dark shades. the brightness and press the Brightness decrease 0 to 100 The function is not available for brightness.
  • Page 27 23” LCD Color Monitor BenQ G2320HDB Resets the User Mode custom Reset Color Press the keys to color settings to the factory change the settings. defaults. Press MENU to leave the Color menu. Dynamic The function will increase the level...
  • Page 28 23” LCD Color Monitor BenQ G2320HDB • sRGB - for better color matching representation with the peripheral devices, such as printers, DSCs, etc. Displays the preview of screen images under Senseye Demo the selected mode from Press the (available when the Picture Mode.
  • Page 29 23” LCD Color Monitor BenQ G2320HDB 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 30 23” LCD Color Monitor BenQ G2320HDB 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 31 23” LCD Color Monitor BenQ G2320HDB Display timing table Pixel Format Horz-f(kHz) Horz -p Vert-f (Hz) Vert -P Pixel Clk (MHz) Source 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 32 Mode 1: To enable the hot plug pin detection. (HDMI port default) Mode 2: To disable the hot plug pin detection. (DVI port default) 8. Add BenQ logo on/off item, the default is “on” 9. add the auto power on item, the default is “off ”...

  • Page 33: Level 2 Circuit Board And Standard Parts Replacement

    23” LCD Color Monitor BenQ G2320HDB Level 2 Circuit Board and Standard Parts Replacement Product Exploded View PART NO UNIT DESCRIPTION REMARK A34G1310ADPA1B0130 BEZEL 23" Q33G0288 2 1C0100 LENS KEPC8QJ3 KEY BOARD Q33G0287ADP 1L0100 KEY PAD 750GLS230HT132N000 PANEL 0G1G1030 8120 SCREW PB &...

  • Page 34: Six Angles' View

    23” LCD Color Monitor BenQ G2320HDB A15G0772101102 MAINFRAME P15G8299 3 BKT-VESA A34G1311ADP 2B0130 REAR COVER 23" A33G0468ADPB1L0100 PLATE_LOGO_B AQ1G1740 12120 SCREW STAND & HINGE A37G0117011 HINGE_BENQ_G2320 A34G1312ADP 1B0100 STAND FRONT STAND & HINGE & AM1G1740 12 47 CR3 SCREW REAR COVER...

  • Page 35: Product Disassembly

    23” LCD Color Monitor BenQ G2320HDB 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 36 23” LCD Color Monitor BenQ G2320HDB 3). Remove the rear cover 4).Remove the Panel Disconnect the Lamp Connections and LVDS Cable connection.
  • Page 37 23” LCD Color Monitor BenQ G2320HDB 5).Remove the Main Board and Power Board Remove the screws and disconnect the all connections, at last you can get the Main Board and Power Board as follow.
  • Page 38 23” LCD Color Monitor BenQ G2320HDB MAIN BOARD POWER BOARD...

  • Page 39: Block Diagram

    23” LCD Color Monitor BenQ G2320HDB Block Diagram Main Board Crystal Panel Interface 24MHZ (CN601) (X401) Scalar RTD2545LH-GR MCU RTD2122L-LF (U501) (U401) H sync RXN/P V sync RXCN/P SCL/SDA D-Sub Connector Key Control Interface (CN301) (CN202) DVI Connector (CN302)
  • Page 40 23” LCD Color Monitor BenQ G2320HDB Power Board AC input Bridge Rectifier Transformer EMI filter and Filter Rectifier diodes Start Resistor (R904, R905) Feedback Circuit PWM Control Power Switch (IC901) （Q901） Photocoupler (IC903) MOSFET Transformer Output Circuit (Q805, Q806) (PT801)

  • Page 41: Schematic Diagram

    23” LCD Color Monitor BenQ G2320HDB Schematic Diagram Main Board CN201 CMVCC CMVCC MVCC FB202 CMVCC BKLT-VBRI DIM# BKLT-EN NC/120OHM C_PANEL_INDEX CMVCC PANEL_ID# Volume# FB201 VCC3 Volume# U201 Mute Mute VOUT 120Ω CONN C202 C204 AP1117E33LA C205 C203 0.1uF/16V 0.1uF/16V Back light Dimming(0.5V~3V)
  • Page 42 23” LCD Color Monitor BenQ G2320HDB DSUB_V H_Sy nc R301 100R 1/16W RTD_H V_Sy nc R303 100R 1/16W RTD_V R304 R305 C302 C303 2K2 1/16W FB302 C304 2K2 1/16W 33pF 33pF R306 100R 1/16W VGA_B+ RTD_B+ RTD_B+ 19R BEAD CN301...
  • Page 43 23” LCD Color Monitor BenQ G2320HDB 150 OHM DVI_5V DSUB_5V FB401 CMVCC D402 BAV70 D401 CMVCC MCU_VCC_S MCU_VCC D403 MCU_VCC_S Q401 LL4148 C402 MMBT3904 R402 C412 1K 1/16W R403 1uF 10V MCU_VCC 3.9KΩ 1/16W C404 R405 R406 R407 U402 AZ431AN-AE1...
  • Page 44 23” LCD Color Monitor BenQ G2320HDB 1.8AVCC R1.8DVCC 150 OHM FB501 Q501 VCC3 KN2907AS R1.8DVCC1 Q502 C507 R507 3.3Ω 2W FB503 C506 C501 KN2907AS 120Ω C505 1uF 10V 0.1uF/16V 1uF 10V C502 22UF50V 0.1uF/16V DGND VCC3 TMDS_VDD FB502 120Ω C503 0.1uF/16V...
  • Page 45 23” LCD Color Monitor BenQ G2320HDB LVDS Panel ( FFC Type ) CN601 CN602 RXO0- RXO0+ RXO1- RXO1+ RXO2- RXO2+ RXOC- RXOC+ RXO3- RXO3+ RXE0- RXE0+ RXE1- RXE1+ RXE2- RXE2+ LVDS_E[0..9] RXEC- RXEC+ LVDS_E0 RXE0- RXE3- RXE3+ RXE0- LVDS_E1 RXE0+...
  • Page 46 23” LCD Color Monitor BenQ G2320HDB Power Board BD901A KBP208G L904 100 OHM 1/4W R918 +16V 100 OHM 1/4W R919 Coil C912 BD901 0.001uF GBU408 100 OHM 1/4W R920 C917 C918 R946 ZD902 470OHM2W T ZX1 8B D906 470UF M 35V...
  • Page 47 23” LCD Color Monitor BenQ G2320HDB 4R7 1/8W 5% R817 +16V Q805 ZD802 ON/OFF RLZ5.6B ZD803 G1 D1 RLZ5.6B R816 4R7 1/8W 5% CN801 R803 R804 PT801 AO4620 5K1 1/8W 5% 5K1 1/8W 5% POWER X'FMR C819 56pF3KV C815 0.1uF...
  • Page 48 23” LCD Color Monitor BenQ G2320HDB 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 49: Troubleshooting Guide

    23” LCD Color Monitor BenQ G2320HDB 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 50 23” LCD Color Monitor BenQ G2320HDB 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 51 23” LCD Color Monitor BenQ G2320HDB 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 52 23” LCD Color Monitor BenQ G2320HDB (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 53 23” LCD Color Monitor BenQ G2320HDB (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 54 23” LCD Color Monitor BenQ G2320HDB Power Board No power Check CN902 PIN3, 4 = 5V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901...
  • Page 55 23” LCD Color Monitor BenQ G2320HDB W / LED, No Backlight Check Inverter input =16V Check adapter and ZD802, ZD803 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 56 23” LCD Color Monitor BenQ G2320HDB 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 57: Pcb Layout

    23” LCD Color Monitor BenQ G2320HDB PCB LAYOUT Main Board...
  • Page 58 23” LCD Color Monitor BenQ G2320HDB...
  • Page 59 23” LCD Color Monitor BenQ G2320HDB Power Board...
  • Page 60 23” LCD Color Monitor BenQ G2320HDB...
  • Page 61 23” LCD Color Monitor BenQ G2320HDB...

  • Page 62: Appendix 1 - Screw List / Torque

    23” LCD Color Monitor BenQ G2320HDB Appendix 1 – Screw List / Torque TD9SRNMYFWBGHN Part No. Type Description Quantity Torque 0G1G1030 8120 M3*8 FOR PB & MAIN FRAME 6±1KGF.CM 0M1G1030 6120 M3*6 FOR MB & MAIN FRAME 6±1KGF.CM AQ1G1740 12120 M4*12 FOR HINGE &...

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