BenQ LCD G2320HD Service Manual
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BenQ LCD G2320HD Service Manual

BenQ LCD G2320HD Service Manual

D-sub +dvi-d +hdmi+black bezel
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See also: User Manual
Applicable Country & Regions: China
Service Manual for BenQ:
LCD G2320HD
(D-SUB +DVI-D +HDMI
+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:04-28-2009
1

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  • 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 G2320HD 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  ...

  • Page 3: Abbreviations & Acronyms

    23” LCD Color Monitor BenQ G2320HD 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 G2320HD 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 G2320HD 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 G2320HD 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ G2320HD 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 G2320HD...
  • Page 9 23” LCD Color Monitor BenQ G2320HD 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 G2320HD 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 G2320HD 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 G2320HD 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 G2320HD...
  • Page 14 23” LCD Color Monitor BenQ G2320HD...
  • Page 15 23” LCD Color Monitor BenQ G2320HD 4. Connect the ISP board as follow: Connect to Connect to the the PC LPT BenQ model 5. The process of ISP write is as follows. a) Double-click ，running the program as follows: b) Click...
  • Page 16 23” LCD Color Monitor BenQ G2320HD c) Click “OK” and the program runs as follows: Click icon and the program runs as follows:...
  • Page 17 23” LCD Color Monitor BenQ G2320HD Click icon, search the correct program and click open: Click icon. If it burns successfully, it will show as the follow picture:...
  • Page 18 23” LCD Color Monitor BenQ G2320HD 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 19 23” LCD Color Monitor BenQ G2320HD 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 20 23” LCD Color Monitor BenQ G2320HD 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 21 23” LCD Color Monitor BenQ G2320HD G2320HD EDID Analog 128 bytes EDID Data (Hex): 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 00 FF FF FF FF FF FF 00 09 D1 26 78 45 54 00 00...
  • Page 22 23” LCD Color Monitor BenQ G2320HD 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 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 G2320HD' Detailed Timing: FF (Monitor SN) '24568790231' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...
  • Page 24 23” LCD Color Monitor BenQ G2320HD Digital 128 bytes EDID Data (Hex): 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 00 FF FF FF FF FF FF 00 09 D1 27 78 45 54 00 00...
  • Page 25 23” LCD Color Monitor BenQ G2320HD 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 26 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 G2320HD' Detailed Timing: FF (Monitor SN) '15648790123' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...
  • Page 27 23” LCD Color Monitor BenQ G2320HD HDMI 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F --------------------Block 0-------------------- 00| 00 FF FF FF FF FF FF 00 09 D1 27 78 45 54 00 00...
  • Page 28 Detailed Timing : 1920x1080 @ 60Hz FD (Monitor Limits): Min. V. rate: 50 Hz Max. V. rate: 76 Hz Min. H. rate: 24 KHz Max. H. rate: 83 KHz Max. P Clock: 210 MHz FC (Monitor Name) : BENQ G2320HD FF (Monitor SN) : 36457980321...
  • Page 29 23” LCD Color Monitor BenQ G2320HD Extension Flag : 01 Block0 Checksum : 93 ------------------------------------------------------- Block 1: Extended Block Type: CEA 861B Detailed Timing Blocks start at Byte: 21 DTV Underscan NO DTV Basic Audio YES YCbCr (4:4:4) YES YCbCr (4:2:2) YES <-Video Short Block Description:->...
  • Page 30 23” LCD Color Monitor BenQ G2320HD Detailed Timing Descriptions: 1280x720 @ 60Hz H Image Size: 480 mm V Image Size: 270 mm Pixel Clock: 74 Hz Refreshed Mode: Non-Interlaced Detailed Timing Descriptions: 1280x720 @ 50Hz H Image Size: 480 mm...
  • Page 31 23” LCD Color Monitor BenQ G2320HD 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 32 23” LCD Color Monitor BenQ G2320HD 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 33 23” LCD Color Monitor BenQ G2320HD 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 34 23” LCD Color Monitor BenQ G2320HD 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 35 23” LCD Color Monitor BenQ G2320HD • 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 36 23” LCD Color Monitor BenQ G2320HD 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 37 23” LCD Color Monitor BenQ G2320HD 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 38 23” LCD Color Monitor BenQ G2320HD Display timing table Horizontal Frequency Vertical Frequency Resolution (KHz) (Hz) 640x480 31.47 59.94 640x480 37.50 75.00 720x400 31.47 70.08 800x600 37.88 60.32 800x600 46.88 75.00 832x624 49.72 74.55 1024x768 48.36 60.00 1024x768 60.02 75.03 1152x864 67.50...
  • Page 39 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 40: Level 2 Circuit Board And Standard Parts Replacement

    23” LCD Color Monitor BenQ G2320HD Level 2 Circuit Board and Standard Parts Replacement Product Exploded View PART NO UNIT DESCRIPTION REMARK A34G1310ADPB1B0130 BEZEL 23" Q33G0288 2 1C0100 LENS KEPC8QJ3 KEY BOARD Q33G0287ADP 1L0100 KEY PAD 750GLS230HT132N000 PANEL PB & MF...

  • Page 41: Six Angles' View

    23” LCD Color Monitor BenQ G2320HD P15G8299 3 BKT-VESA REAR COVER & 0Q1G1030 6120 SCREW HEADPHONE JACK BOARD HJPF9AA1 HEADPHONE JACK BOARD A34G1311ADP 1B0130 REAR COVER 23" A33G0468ADPB1L0100 PLATE_LOGO_B AQ1G1740 12120 SCREW STAND & HINGE A37G0117011 HINGE_BENQ_G2320 A34G1312ADP 1B0100 STAND FRONT STAND &...

  • Page 42: Product Disassembly

    23” LCD Color Monitor BenQ G2320HD 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 43 23” LCD Color Monitor BenQ G2320HD C. Put the disassembly tool into the nick。...
  • Page 44 23” LCD Color Monitor BenQ G2320HD D. Gash slightly the latch with the disassembly tool.
  • Page 45 23” LCD Color Monitor BenQ G2320HD E. When the all latches open, remove the bezel. 3). Disconnect the key board connections...
  • Page 46 23” LCD Color Monitor BenQ G2320HD 4). Remove the rear cover 5).Remove the Panel Disconnect the Lamp Connections and LVDS Cable connection.
  • Page 47 23” LCD Color Monitor BenQ G2320HD 6).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 48 23” LCD Color Monitor BenQ G2320HD MAIN BOARD POWER BOARD...

  • Page 49: Block Diagram

    23” LCD Color Monitor BenQ G2320HD 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 50 23” LCD Color Monitor BenQ G2320HD 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 51: Schematic Diagram

    23” LCD Color Monitor BenQ G2320HD Schematic Diagram Main Board CN101 RED+ FB102 30 OHM D_SUBR+ R102 75R 1/16W 5% D_SUBRIN+ C102 0.047uF RED- PC5V GREEN+ FB104 30 OHM D_SUBG+ R103 75R 1/16W 5% D_SUBGIN+ C103 0.047uF GREEN- PC5V BLUE+...
  • Page 52 23” LCD Color Monitor BenQ G2320HD VCC3.3 DVDD VCC3.3 DVI_VCC ADC_VDD AUDIO_VDD DVDD FB401 120 OHM FB402 120 OHM VCC3.3 C402 DVI_VCC VCC1.2 A_VCC C408 C409 C410 C403 C404 C405 C406 C407 VCC3.3 100uF16V 0.1uF 16V 0.1uF 16V 100uF16V 0.1uF 16V 0.1uF 16V...
  • Page 53 23” LCD Color Monitor BenQ G2320HD PA[0..9] PA[0..9] CN404 RXO0- RXO0+ RXO1- RXO1+ RXO2- PB[0..9] RXO2+ PB[0..9] RXOC- RXOC+ RXO3- RXO3+ RXE0- RXE0+ CN403 RXE1- RXE1+ VLCD RXE2- RXO0- RXO0+ RXE2+ RXO1- RXO1+ RXEC- RXO2- RXO2+ VLCD RXEC+ RXOC- RXOC+...
  • Page 54 23” LCD Color Monitor BenQ G2320HD CN602 +5V_AUDIO FB601 120 OHM +5V_AUDIO R601 NC/22K 1/16W 5% CN601_L C601 NC/1uF 10V R602 CONN R603 NC/22K 1/16W 5% CN601_R C602 NC/1uF 10V 100K 1/16W 5% R604 560R 1/16W 5% OUTL CN601 R605...
  • Page 55 23” LCD Color Monitor BenQ G2320HD VCC3.3 +5V_VCC U702 VOUT HDM I1_+5V C701 C702 R701 +5V_VCC 100UF16V 0.1uF 16V 10K 1/16W 5% HDMI1_+5V R718 TO252 CN701 R702 100R 1/16W 5% Adj_BACKLIGHT 4 D701 D702 NC/SM 340A VCC3.3 0 OHM 1/4W...
  • Page 56 23” LCD Color Monitor BenQ G2320HD 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 ZX18B D906 470UF M 35V...
  • Page 57 23” LCD Color Monitor BenQ G2320HD 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 58 23” LCD Color Monitor BenQ G2320HD EAR Board CN652 HP_R HP_SENSE HP_L CONN C651 C652 C653 0.01uF 0.01uF 0.01uF CN651 HP_L R653 0R05 1/10W 5% HP_SENSE R652 100R 1/10W 5% HP_R R651 0R05 1/10W 5% PHONEJACK R654 0R05 1/10W 5%...
  • Page 59 23” LCD Color Monitor BenQ G2320HD Key Board LED_RED# LED_GRN# LED001 CN001 CONN 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...

  • Page 60: Troubleshooting Guide

    23” LCD Color Monitor BenQ G2320HD 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 61 23” LCD Color Monitor BenQ G2320HD 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 62 23” LCD Color Monitor BenQ G2320HD 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 63 23” LCD Color Monitor BenQ G2320HD (2) No picture No picture Check if the Pin 4, 7, 8 of CN701 is 5V input Check power board Measure U702 Pin2=3.3 and U704 Pin2=1.2V Replace U702 and U703 X401 oscillate waveforms are normal...
  • Page 64 23” LCD Color Monitor BenQ G2320HD (3) White screen White Screen Measure Q701 base X401 oscillate is low level? waveform is normal Replace X401 Check Q701 and Q704 are Check U401 broken or CN403 solder? Replace U401 Check Correspondent Check reset circuit of component.
  • Page 65 23” LCD Color Monitor BenQ G2320HD 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 66 23” LCD Color Monitor BenQ G2320HD 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 67 23” LCD Color Monitor BenQ G2320HD 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 68: Pcb Layout

    23” LCD Color Monitor BenQ G2320HD PCB LAYOUT Main Board...
  • Page 69 23” LCD Color Monitor BenQ G2320HD...
  • Page 70 23” LCD Color Monitor BenQ G2320HD Power Board...
  • Page 71 23” LCD Color Monitor BenQ G2320HD...
  • Page 72 23” LCD Color Monitor BenQ G2320HD...

  • Page 73: Appendix 1 - Screw List / Torque

    23” LCD Color Monitor BenQ G2320HD Appendix 1 – Screw List / Torque HD9SNQMBFWBQDN Part No. Type Description Quantity Torque FOR PB & MAINFRAME 0G1G1030 8120 M3*8 6±1KGF.CM FOR MB & MAINFRAME FOR MB & MAINFRAME 0M1G1030 6120 M3*6 6±1KGF.CM FOR HMDI &...

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