BenQ G922HD Service Manual
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BenQ G922HD Service Manual

18.5” lcd color monitor
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See also: User Manual
Applicable Country & Regions: China
Service Manual for BenQ:
LCD G922HD
(D-SUB+DVI+ Silver Black/
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 G922HD

  • 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

    18.5” LCD Color Monitor BenQ G922HD 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

    18.5” LCD Color Monitor BenQ G922HD 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 18.5” LCD Color Monitor BenQ G922HD 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

    18.5” LCD Color Monitor BenQ G922HD 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

    18.5” LCD Color Monitor BenQ G922HD 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ G922HD offers numerous features and functions, for example: ● TFT display (Thin Film Transistor; active matrix) ● Minimal space requirements thanks to slim casing ●...

  • Page 8: Product Overview

    18.5” LCD Color Monitor BenQ G922HD 5. Product Overview 5.1 Monitor Specifications G922HD Panel Type (TN / VA / IPS) Panel Size 18.5"W(2 lamps) Display Area 409.8 x 230.4 Max. Resolution 1366x768 Brightness (Typ.) 250 nits Contrast Ratio (Typ.) / DCR (Min.) 1000:1 (Panel) /40000:1 (DCR TYP) Min :20000:1 Panel / Display Viewing Angle (H/V), CR≧10...
  • Page 9 18.5” LCD Color Monitor BenQ G922HD Chassis Colors Silver Black/Black Carton Brown Carton with at least C flute Power LED Green (ON)/ Amber (Standby) Tilt (Up / Down) 20° ~ -5° VESA Wall Mount 100 x 100mm Kensington Lock Mechanical Design...

  • Page 10: Packing

    18.5” LCD Color Monitor BenQ G922HD 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 18.5” LCD Color Monitor BenQ G922HD 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

    18.5” LCD Color Monitor BenQ G922HD 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 G922HD 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 18.5” LCD Color Monitor BenQ G922HD c. Click icon, search the program” BenQ_G922HD_RTD2525LH_CMO185.H00”, and click open: d. Click icon, search the program” BenQ_G922HD_RTD2525LH_CMO185.H01”, and click open: e. Click icon, search the program” BenQ_G922HD_RTD2525LH_CMO185_EXTEND”, and click open: f. Click icon, until appear the follow Fig, writer completed...

  • Page 15: Ddc Instruction

    18.5” LCD Color Monitor BenQ G922HD 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 18.5” LCD Color Monitor BenQ G922HD 4. Take analog DDC write for example, as follow a. Double-click ，appear as follow: b. Choose “Analog ” and then click “Loadfile”, it will show the picture as follow:...
  • Page 17 18.5” LCD Color Monitor BenQ G922HD 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 18.5” LCD Color Monitor BenQ G922HD G922HD 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 3D 78 45 54 00 00...
  • Page 19 18.5” LCD Color Monitor BenQ G922HD 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 : 41cm. Max. V. Image Size : 23cm. Display Gamma: DPMS Features, Stand-by: No.
  • Page 20 30KHz Max. H. rate: 63KHz Max. Pixel Clock: 110MHz Detailed Timing: FC (Monitor Name) 'BenQ G922HD' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum: Digital 128 bytes EDID Data (Hex): x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF...
  • Page 21 18.5” LCD Color Monitor BenQ G922HD Header: 00 FF FF FF FF FF FF 00 <-x-Header-x-> <---Vendor/Product Identification---> ID Manufacturer Name: ID Product Code: 783E ID Serial Number: 45540000 Week of Manufacture: Year of Manufacture: 2006 <-x-Vendor/Product Identification-x-> <---EDID Structure Version/Revision--->...
  • Page 22 Detailed Timing: FF (Monitor SN) '15649870231' Detailed Timing: FD (Monitor limits) Min. V. rate: 50Hz Max. V. rate: 76Hz Min. H. rate: 30KHz Max. H. rate: 63KHz Max. Pixel Clock: 110MHz Detailed Timing: FC (Monitor Name) 'BenQ G922HD' <-x-Detailed Timing Descriptions-x-> Extension Flag: Checksum:...

  • Page 23: Adjustment / Alignment Procedure

    18.5” LCD Color Monitor BenQ G922HD 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 24 18.5” LCD Color Monitor BenQ G922HD 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 25 18.5” LCD Color Monitor BenQ G922HD 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 26 18.5” LCD Color Monitor BenQ G922HD Press MENU to leave the Color menu. The function will increase the level of contrast to provide sharper and more detailed image quality. Press the ENTER key to select this Dynamic 0 to 5 option.
  • Page 27 18.5” LCD Color Monitor BenQ G922HD 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 28 18.5” LCD Color Monitor BenQ G922HD 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 • D-sub Input cable connection type. the settings.
  • Page 29 18.5” LCD Color Monitor BenQ G922HD 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 30 18.5” LCD Color Monitor BenQ G922HD 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 31 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 32: Level 2 Circuit Board And Standard Parts Replacement

    18.5” LCD Color Monitor BenQ G922HD Level 2 Circuit Board and Standard Parts Replacement Product Exploded View PART NO UNIT DESCRIPTION Q34G0543ADPC1B0101 BEZEL(L185W-9BENQ) Q33G0288 2 1C0100 LENS Q33G0287ADP 1L0100 KEYPAD Q15G0405201 MAINFRAME Q34G0544ADP 2B0130 REAR COVER18.5" Q33G0289ADPA1L0100 LOGO COVER Q34G0545ADP 1B0100...

  • Page 33: Six Angles' View

    HINGE & STAND 0M1G1740 8 47 CR3 HINGE & STAND AM1G1740 12 47 CR3 HINGE & STAND & MF ART. Q44G8015101 EPS-L Q44G8015201 EPS-R Q44G8015201 18.5 LCD BENQ CARTON 756GQ9CB RH104 MAIN BOARD PWPC8521VYD5 POWER BOARD KEPC8QJ3 KEYBOARD Six angles’ view...

  • Page 34: Product Disassembly

    18.5” LCD Color Monitor BenQ G922HD 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 35 18.5” LCD Color Monitor BenQ G922HD 3). Remove the rear cover 4).Remove the Panel Disconnect the Lamp Connections and LVDS Cable connection.
  • Page 36 18.5” LCD Color Monitor BenQ G922HD 5).Remove the Main Board and Power Board 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 37 18.5” LCD Color Monitor BenQ G922HD MAIN BOARD POWER BOARD...

  • Page 38: Block Diagram

    18.5” LCD Color Monitor BenQ G922HD 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 39 18.5” LCD Color Monitor BenQ G922HD Power Board AC input Bridge Rectifier Transformer EMI filter Rectifier diodes and Filter Start Resistor R904, R932 Feedback Circuit PWM Control Power Switch (IC901) (Q901) Photocoupler (IC903) Transformer MOSFET Output Circuit (T801) (Q802) Lamp...

  • Page 40: Schematic Diagram

    18.5” LCD Color Monitor BenQ G922HD 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 41 18.5” LCD Color Monitor BenQ G922HD 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 42 18.5” LCD Color Monitor BenQ G922HD 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 43 18.5” LCD Color Monitor BenQ G922HD 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 44 18.5” LCD Color Monitor BenQ G922HD 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 45 18.5” LCD Color Monitor BenQ G922HD 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 46 18.5” LCD Color Monitor BenQ G922HD 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 47: Troubleshooting Guide

    18.5” LCD Color Monitor BenQ G922HD 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 48 18.5” LCD Color Monitor BenQ G922HD 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 49 18.5” LCD Color Monitor BenQ G922HD 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 50 18.5” LCD Color Monitor BenQ G922HD (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 51 18.5” LCD Color Monitor BenQ G922HD (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 52 18.5” LCD Color Monitor BenQ G922HD 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 53 18.5” LCD Color Monitor BenQ G922HD 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 54 18.5” LCD Color Monitor BenQ G922HD 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 55: Pcb Layout

    18.5” LCD Color Monitor BenQ G922HD PCB LAYOUT Main Board...
  • Page 56 18.5” LCD Color Monitor BenQ G922HD...
  • Page 57 18.5” LCD Color Monitor BenQ G922HD Power Board...

  • Page 58: Appendix 1 - Screw List / Torque

    18.5” LCD Color Monitor BenQ G922HD Appendix 1 – Screw List / Torque (T89MRHMYFWBFHN) Part No. Type Description Quantity Torque 0M1G 130 6120 M3*6 FOR PANEL & MAINFRAME 3±0.5KGF. CM 0M1G1730 6120 M3*6 FOR ALL BOARDS & MAIN FRAME 6±1 KGF. CM...

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