BenQ G2420HD Product Service Manual
  1. Manuals
  2. Brands
  3. BenQ Manuals
  4. Monitor
  5. G2420HD
  6. Product service manual

BenQ G2420HD Product Service Manual

Benq g2420hd 24’ lcd monitor
Hide thumbs Also See for G2420HD:
Table of Contents

Advertisement

Quick Links

See also: User Manual
Product Service Manual – Level II
Service Manual for BenQ:
G2420HD
P/N: 9H.L3ALB.QBx
Applicable for All Regions
Version: 001
Date:2009/05/26
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 (May, 2009)
© Copyright BenQ Corporation 2009. All Right Reserved.
- 1 -

Advertisement

Table of Contents
loading

Related Manuals for BenQ G2420HD

Summary of Contents for BenQ G2420HD

  • Page 1 - 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 (May, 2009) ©...

  • Page 2: Table Of Contents

    Content Index Abbreviations & Acronyms ................3 1 About This Manual..................3 1.1. Trademark ......................3 2 Introduction ....................4 2.1. RoHS (2002/95/EC) Requirements ..............4 2.2. Safety Notice ......................4 2.3. Compliance Statement ..................4 2.4. General Descriptions ................... 4 2.5.

  • Page 3: Abbreviations & Acronyms

    Abbreviations & Acronyms 1 About This Manual This manual contains information about maintenance and service of BenQ products. Use this manual to perform diagnostics tests, troubleshoot problems, and align the BenQ product. 1.1. Trademark The following terms are trademarks of BenQ Corporation:...

  • Page 4: Introduction

    This Service Manual contains general information. There are 3 levels of service: Level 1: Cosmetic / Appearance / Alignment Service Level 2: Circuit Board or Standard Parts Replacement Component Repair to Circuit Boards Level 3: 2.5. Related Service Information BenQ Global Service Website: http://www.benq.com/support/ eSupport Website: http://esupport.benq.com/v2 - 4 -...

  • Page 5: Product Overview

    3.1. Specification 3.1.1 Introduction G2420HD is defined 24’W LCD Monitor supports WXGA (1920x1080) resolution with DPMS (Display Power Management System) and Senseye function. There are three different input types, D-sub, DVI and HDMI, of models. G2420HD adopts AUO panel, M240HW01 V2.
  • Page 6 < 2.0 Arms  Power Consumption Normal “On” operation <49 W LED: Green DPMS “Off” state < 1 W LED: Off  DPMS(G2420HD) DPMS “Sleep” state < 1 W LED: Amber 110 VAC < 30 A (peak)  Inrush Current Cold-start 220 VAC <...
  • Page 7 3.1.2.2 Signal interface Item Condition Spec OK N.A Remark Color: Black  Length: 1500 +/- 30 15-pin D-Sub Signal Cable Color: Black  24-pin DVI-D Length: 2000 +/- 50 15-pin D-sub See Note-1  For 15-pin D-sub connector 24-pin DVI-D See Note-2 ...
  • Page 8 Note-2: The pin assignment of 24-pin DVI-D connector is as below, P Signal Assignment Signal Assignment TMDS RX2- Floating TMDS RX2+ +5V Power TMDS Ground Ground Floating Hot Plug Detect Floating TMDS RX0- DDC Clock TMDS RX0+ DDC Data TMDS Ground Floating Floating TMDS RX1-...
  • Page 9 50-76 Hz 3.1.2.5 Plug & Play DDC2B DDC-CI Support Item Condition Spec OK N.A Remark  DDC channel type DDC2B Refer to BenQ LS  EDID Version 1.3 EDID definition. Refer to BenQ  DDC-CI Version 1.1 or Later DDCCI requirement definition.
  • Page 10 3.1.2.6 Support Timings - 10 -...
  • Page 11 HDMI video support timing 3.1.3 Operational & Functional Specification 3.1.3.1 Video performance *All spec. of monitor need to warm up at least 1hr. Item Condition Spec OK NA Remark Any input resolution  Resolution modes which are under 1920 x 1080 1920x1080 Test Condition: Set Contrast at 50,...
  • Page 12 3.1.3.2 Brightness Adjustable Range Item Condition Spec OK NA Remark At default contrast level (Max. brightness value – Brightness adjustable (saturate point) & Full- Min. brightness value)  range white color pattern ≧ 100 cd/㎡ 3.1.3.3 Acoustical Noise Item Condition Spec OK NA Remark At 4 cm distance...
  • Page 13 (3) Procedure: Confirmed sample with appearance and function ready before testing then compare with after test record as brightness, uniformity and contrast ratio. Perform random vibration after sine-wave vibration test. Test Spectrum: 20 Hz 0.0185(g2/Hz) 200Hz 0.0185(g2/Hz) Unpackaged, Non-  (2) Unpackaged Vibration Duration : 5 Minutes Operating...
  • Page 14 3.1.3.9 Audio performance (Ear-Jack, For HDMI audio only) Item Condition Spec OK NA Remark Preamp + Power amp  (1)Output power 1 Wrms/CH @ 1KHz  (2)THD (@ 1W) <1%  (3)S/N ratio >40dB Speaker Driver  (1)Nominal impedance 4 ohm ...
  • Page 15 Blue y 0.04 0.07 0.10 Color Coordinates (CIE) White x 0.283 0.313 0.343 White White y 0.299 0.329 0.359 9 points Luminance Uniformity measurement White Luminance @ CCFL [cd/m 6.0mA (center) Crosstalk (in 75Hz) * The test methods for the above items definition, please refer to the relative panel specification. 3.1.5 User Controls 3.1.5.1 User’s hardware control definition Item...
  • Page 16  Sharpness  Display Information For input timing  Volume For HDMI Audio only  Mute For HDMI Audio only  Hot key for Brightness  Hot key for Contrast  Hot key for Volume  Hot key for Input Select ...
  • Page 17 3.1.7 Pallet & Shipment 3.1.7.1 Container Specification Quantity of products Quantity of Products Quantity of pallet Stowing Type (sets) (sets) (sets) Container (Every container) (Every Pallet) (Every Container) Pallet A: 76 Pallet A: 4 Pallet B: 68 Pallet B: 4 With pallet Pallet C: 24 Pallet C: 2...
  • Page 18  FIMKO EN60950  CE Mark 73/23/EEC  IEC60950  EN60950 EN60950 /  TUV/GS EK1-ITB 2000:2003  CCC (China) CB4943  GOST EN60950  SASO IEC60950  CE Mark 89/336/EEC  FCC (USA) FCC Part 15 B  EN55022 Class B ...

  • Page 19: Customer Acceptance

    3.2.1. SCOPE This document establishes the general workmanship standards and functional Acceptance criteria for LCD color monitor model G2420HD Produced by BenQ Corporation. 3.2.2. PURPOSE The purpose of this publication is to define a procedure for inspection of the LCD monitor by means of a customer acceptance test, the method of evaluation of defects and rules for specifying acceptance levels.
  • Page 20 3.2.6. CLASSIFICATION OF DEFECTIVES A defective is a product which contains one or more defects. The defective will be classified into following classes. Critical defective A critical defective contains one or more critical and may also contain major and/or minor defects.
  • Page 21 TEST EQUIPMENTS 1. PC with display adapter or other specific display adapter which is agreed upon by both parties 2. Test program by BenQ 3. Ruler 4. Power saving test tool 5. Minolta color analyzer ( CA-110 or BM – 7 ) 3.2.12.
  • Page 22 Description Class 3.4 Poor print of logo or name plate Major 3.5 Label on product Wrong or missing Major 3.6 Scratched or dirty but legible spec. label Minor 3.7 GAP between LCD and front bezel is over 2.0 mm Major 3.8 Dot/area discolor over 1mm dia.
  • Page 23 3.2.13. OPERATIONAL INSPECTION CRITERIA 1. TEST PATTERN 2. SPECIFICATIONS 3. OPERATIONAL INSPECTION CRITERIA 3.2.13.1. List of test pattern PATTERN TEST ITEM FULL WHITE H - Size , V – Size .Viewing Angle Light Output Impurity, Spot check Contrast Ratio Brightness adjust Range DARK Background, Spot check FULL W , R , G , B...
  • Page 24 3.2.13.2. Video performance Item Spec N.A Remark Both for analog and  Max. support Pixel rate 170 MHz digital inputs Both for analog and  Max. Resolution 1920x1080@60 digital inputs <5.89 ns 1920 x 1080 @ 60Hz  Rise time + Fall time (50% of minimum pixel (max.

  • Page 25: Level 1 Cosmetic / Appearance / Alignment Service

    4 Level 1 Cosmetic / Appearance / Alignment Service Software / Firmware Upgrade Process 4.1.1 Hardware Requirement: 1. I2C board x 1 (a.Print Board b. I2C Board) 2. DSUB VGA cables x 2 3. Printer cable (with one male connector and another female connector) x 1. 4.
  • Page 26 Link “I2C BD, Power cable and Signal cable 4.1.2 Software prepare Realtek.exe Step 1: Press RTD Tool Step 2: Choose “ IIC”, “Serial Flash” and “0x94”. Then, press “ISP” - 26 -...
  • Page 27 Step 3: Click the “Bank” and Find the F/W 1. xxx.H00 2. xxx.H01 3. xxx.H02 4. xxxEXT.Hex Step4: Choose “P-Flash” and “Auto” Step5: Press to run the program Step6: Check result, If the words showed in red, need to run the program again - 27 -...
  • Page 28 4.1.3 EDID Upgrade Procedure Step 1: Run the program “Q-EDID-V016.exe”, when the UI popped up Note: If “VGA” choose 128bytes, and “HDMI” choose 256bytes - 28 -...
  • Page 29 Step 2: Click “Open File” and select “VGA” or “HDMI” EDID file Step 3: If load file is successful, it shows “Open EDID Table OK.” And then, Click “Write EDID” button to update EDID - 29 -...
  • Page 30 Step 4: If write EDID is successful, it shows ”Write EDID OK …” And then, click “Read EDID” button to check if successful or not. Step 5: If read EDID is successful, it shows” Read EDID OK …” - 30 -...

  • Page 31: Alignment Procedure (For Function Adjustment)

    4.2. Alignment procedure (for function adjustment) A. Preparation: Setup input timing ICL-605( 1280x1024@75Hz ), Pattern:5-Mosaic. Setup unit and keep it warm up at least 30 minutes. B. Timing adjustment: Enter factory setting area (press “ENTER”, “MENU” and then press “SOFTPOWER”). Check the settings to following values: Contrast = 50 Brightness = 90...
  • Page 32 D. Color adjustment: 1. Setup input timing ICL-605, white pattern. 2. Confirm auto color adjustment had already done. 3. Measure color temperature by Minolta CA-110 (or equivalent equipment). 4. Check the color temperature Bluish, Reddish & Normal. The color temperature specification as follows: White Balance 0.283+(-) 0.015...
  • Page 33 F. Command definition : PC Host will send 0x7C IIC slave address and then following 4 bytes command Byte Byte I2C Send Command Byte1 Byte4 OK N.A. Remark cksu  Write Contrast to MCU RAM 55 Data cksu  Write Brightness to MCU RAM 56 Data cksu Write data to MCU RAM...
  • Page 34 cksu  Write Cx R-Gain Data to EEPROM 7C Data cksu  Write Cx G-Gain Data to EEPROM 7D Data Reserved for some cksu model have extra color  Write Cx B-Gain Data to EEPROM 7E Data temperature cksu  Write Contrast to EEPROM 92 Data cksu...
  • Page 35 Read C2 (sRGB) B-Gain data from cksu  EEPROM Read C3 (Reddish) R-Gain data from cksu  EEPROM Read C3 (Reddish) G-Gain data from cksu  EEPROM Read C3 (Reddish) B-Gain data from cksu  EEPROM cksu  Read User R-Gain data from EEPROM cksu ...
  • Page 36 cksu  Read OSD Rotation from EEPROM Change Color Temp. to cksu  C1/9300K/Bluish Change Color Temp. to cksu  C2/6500K/sRGB Change Color Temp. to cksu  C3/5800K/Reddish Change C/T immediately. cksu And store C/T index to  Change Color Temp. to User EEPROM.
  • Page 37 cksu  Increase ADC B-Gain 35 Data cksu  Decrease ADC R-Offset2 23 Data cksu  Decrease ADC G-Offset2 24 Data cksu  Decrease ADC B-Offset2 25 Data cksu  Decrease ADC R-Gain 33 Data cksu  Decrease ADC G-Gain 34 Data cksu ...
  • Page 38 PowerOFF: Data=AA cksu PowerON: Data=Other  Change Power Status D0 Data XX Value Asia: Data=AA ckssu European: Data=Other  Change Language Type D1 Data XX Value EEPROM Bank R/W (For Debug using only, not for Production Line Write EEPROM directly) Addr cksu ...

  • Page 39: Level 2 Disassembly /Assembly Circuit Board And Standard Parts Replacement

    5 Level 2 Disassembly /Assembly Circuit Board and Standard Parts Replacement 5.1. Exploded View - 39 -...
  • Page 40 5E.0BJ06.001 5E.0RM03.001 5E.0RM02.001 5E.0RM01.011 5F.LUDB0.051 * This Service BOM is subject to change. Please check it on eSupport and SPO system before service parts order release. - 40 -...

  • Page 41: Disassembly /Assembly

    5.2. Disassembly /Assembly 5.2.1 Disassembly SOP Preparation before disassemble 1. Clean the room for disassemble 2. Identify the area for monitor 3. Check the position that the monitors be placed and the quantity of the monitor; prepare the area for material flow; according to the actual condition plan the disassemble layout 4.
  • Page 42 Turn over the monitor ,dismantle the Rear cover from the monitor(if it have earphone function, pull the earphone wire out of the connector) Pull the c/b wire out of the c/b connector. Tear off the C/B wire from panel ,move away C/B and button Tear off the big aluminum foil.
  • Page 43 Tear off the two acetic tapes (if it have that ) Pull out the light wires from connector . Disassemble the SHD Tear off all the tapes sticked on the BKT (including aluminum foils and acetic tapes ) - 43 -...
  • Page 44 Tear off the yellow tape on the LVDS FFC ,and pull LVDS FFC out off the panel . Disassemble the hexangular screws ( four or two ) Turn over the BKT , and Screw-driver disassemble the power board and I/F board .---- -7 screws Pull out the connector - 44 -...

  • Page 45: Assembly Sop

    5.2.2 Assembly SOP Preparation before assemble 1. Clean the room for work 2. Identify the area for material 3. Prepare the implement, equipments, materials as bellow: 1) Press-fixture 2) working table 3) Screw-driver 4) knife*1 5) glove 6) cleaning cloth 7) ESD protection picture Operation...
  • Page 46 Lock PCBA screw .-- Screw driver : five or six PCBA 7±1kg screw ,one earth screw . Turn over the bkt, and Screw lock the hexangular driver:5+0.6kg screws ( four or two ) Lock one HDMI screw Screw driver: (if it have that ) Side mount: 3±0.6 Other:...
  • Page 47 Fetch yellow tape, and stick it on the LVDS Use location location tool: tool ,location the bkt on G24101 panel Stick tapes follow standard: One tape stick on angel side ,one on right side ,one on ground side . Stick acetic tapes on left Insert light wires, and make sure it connect...
  • Page 48 Stick big aluminum foil on the side (like left PIC) Fetch bezel ,and put panel into bezel (don’t touch the LCD screen. Put c/b in the button, and put button in bezel. Tear the tapes on the back of c/b wire , insert c/b connector in I/F ,stick c/b on panel .
  • Page 49 Assay stand .(follow Screw driver : picture on left .) put 7.5+0.5kg hinge in front cover ,and lock four screws, then cover the back cover ,last put the clip in front cover. Put stand in monitor, Screw driver : and lock two screws . 9.0+1.0kg Fetch base ,and assay base on monitor .

  • Page 50: Main-Shielding Position

    40mm BenQ G2220HD 84mm 44.5mm 44.5mm BenQ G2020HD 69mm 42mm 42mm BenQ G2410HD AUO 78.65mm 57.2mm 57.2mm BenQ G2410HD CMO 72.65mm 55.85mm 55.85mm BenQ T2200 56.69mm 40mm 40mm BenQ G2420HD/G2420HDB 78.65mm 57.2mm 57.2mm AL-Tape L Shape Tooling - 50 -...

  • Page 51: Packing

    5.4. Packing - 51 -...

  • Page 52: Block Diagram

    “DDC/CI” and “Auto” which can manual controlled items. G2420HD also offer DDC2/CI function to meet VESA standard. The G2420HD consists of a LCD module with 4 lamps, a power board including an inverter, a control board, a Interface board. The block diagram is shown as below.

  • Page 53: Trouble Shooting Guide

    5.6. Trouble Shooting Guide 5.6.1 No Display or display is unstable on analog, digital or video port: No picture or picture unstable on Analog port or DVI port or HDMI port Power off Turn on power Plug the cable then turn Does cable plugs in connector? on power again.
  • Page 54 5.6.2 BUTTON Function: OSD is not working Plug control BD then retry Is control BD connecting? Is bottom key normally? Replace control BD then retry Replace Control BD Is OSD working?? Check Interface BD 5.6.3 OSD Function: OSD doesn’t work Is control BD working? Replace control BD Check interface BD...
  • Page 55 5.6.4 Power no work troubleshooting 5.6.4.1 DC/DC converter Panel or I/F BD or Audio no function DC/DC Check wire and I/F +5V(+5.4V) valid? converter Check L852, Q852, FD852, FD853, Q855, Q856 Replace components (L851, Q851, FD851, Q853, Q854) Check IC851 pin1 frequency, DTC, Check IC851 Replace IC851...
  • Page 56 5.6.4.2 AC/DC converter - 56 -...
  • Page 57 5.6.4.3 Inverter Panel lamp no work AC/DC converter Check V-INVERTER DC/DC converter Check IC801 VDDA Check BL_ON, BRT_ADJ Check wires, I/F BD Check IC801 Replace IC801 frequency, output components Check T801, T802, Q801~Q804 Replace components - 57 -...

  • Page 58: Circuit Operation Theory

    5.7. Circuit Operation Theory A-1.) Interface board diagram: A-2.) Circuit operation theory: (a) Monitor Diagram: - 58 -...
  • Page 59 (b) Circuit operation theory A basic operation theory for this interface board is to convert analog signals of Red, Green and Blue to digital signals of Red, Green and Blue. The scaling IC has internal A/D converter, internal OSD, built in RSDS transmitter and auto-detect input timing functions. A/D converter is convert analog signal to digital data.
  • Page 60 (5) “Auto” key: to perform auto adjustment (6) LED: It indicates the DPMS status of this LCD monitor; blue light means DPMS on (Normal operating condition). Amber light means DPMS off (Power Saving). A-3.) Power board diagram: Inverter EMI Filter Rectifier Isolation Rectifier and...
  • Page 61 #2 Rectifier and filter AC Voltage (90-264V) is rectified and filtered by BD601, C605 (See Fig 3) and the DC Output voltage is 1.4*(AC input). (See Fig.3) GSIB4A60-LF BD601 C605 150U 450V <Spec> Fig. 3 #3 Switching element and Isolation power transformer When the Q601 turns on, energy is stored in the transformer.
  • Page 62 #4 Rectifier and filter D701, D702, C701, C702, C703 are used to produce DC output. (See Fig.5) D701 Y G862C15RSC V-INVERTER T601 D702 R701 Y G862C15RSC C703 C701 C702 470U 35V 470U 35V 470U 35V RC1820 RC1820 RC1820 C705 C704 R702 1000P K 1000P K...
  • Page 63 #5 PWM Controller The TEA1530(A)T can be used in Fixed Frequency converter designs for low voltage, high current applications. At low power (standby) levels, the system operates in cycle skipping mode which minimizes the switching losses during standby. The proprietary high voltage BCD800 process makes direct start-up possible from the rectified universal mains voltage in an effective and green way.

  • Page 64: Feedback Circuit

    #6 Feedback circuit PC123 is a photo-coupler and KA431 is a shunt regulation. They are used to detect the output voltage change and be the primary and secondary isolation. When output voltage changes, the feedback voltage will be compared and duty cycle will be decided to control the correct output voltage.
  • Page 65 IC851(TL1451) is a 2-way PWM control IC. C851/R851 determine the frequency of PWM. Pin 1IN+/1IN- and 2IN+/2IN- are the inputs of the error amplifiers. 1IN+/2IN+ are used as the feedback pins for DC-DC circuit. 1DTC/2DTC are used for determining the threshold states of dead time control. C854, C855, C857, C858, R855 and R873 are used for gain/phase compensation.
  • Page 66 P-MOSFET Q852 is used for switching of step-down converter. And FD852/FD853 are the flywheel diodes. R874/R875 determine the feedback to IC851 to set up the output to +5V or +3.3V. V-INVERTER F851 32V 2A Q852 2SJ598 PANEL_+5V IC851 L852 TL1451ACN R872 R871 C867...

  • Page 67: Full-Bridge Configuration

    Full-Bridge Configuration ZD801 R801 TZMC6V2 5.1K Q801 C827 4.7U M T 801 C829 4.7U M R811 Q802 FD801 ERB83-004 R812 Fig. 1 Fig. 1: Q801, Q802 and T801 form a full-bridge configuration. The full-bridge switch is configured such that Q801 N-MOS and Q8026 P-MOS are ON while Q801 P-MOS and Q802 N-MOS are OFF in a half-cycle.
  • Page 68 Feed-back Circuit C815 TP801 100P J CN801 TP802 C819 5PF D R815 2K62272102 2.2K R819 D809 T 801 100K LL4148 D801 R831 R834 C831 C820 BAV99 511 F 0.22U K 470P J R820 20K F C816 TP803 100P J CN802 TP804 IC801 C821...

  • Page 69: Appendix 1 – Screw List / Torque

    Appendix 1 – Screw List / Torque STANDARD SCREW TORQUE SPEC. HOLE MOUNTING TORQUE Screw ITEM DESCRIPTION SIZE MATERIAL (KG-CM) Head (MM) Metal; SCRW MACH HEX #4- 8F.205B4.019 D-SUB;DVI 5.0±0.6 5.0±0.6 #4-40 40*0.3" N Connector Metal Side mount: SCRW MACH Metal to metal 3±0.6 8F.5A224.6R0...
  • Page 70 None tread： 8～ SCRW TAP PH W/F M3*6 Aluminum Φ2.68±0.0 10 8F.VG234.6R0 Have tread: TP-S ZN (Heatsink) 6～8 Aluminum: SCRW TAP FLAT+EXT Metal 11 8F.VZ526.6R0 M4*0.7 M4*6L ZN-W Metal to metal 10±1.0 Metal SCRW TAP Metal to metal Φ2.68±0.0 12 8F.HA334.8R0 FPHM3*6(6/1)TP-S B-ZN Plastic to metal...
  • Page 71 SCRW TAP PH F/10WSH Φ2.35±0.0 8F.00608.6R0 PLASTIC 4.5±0.5 M3*6L B-ZN Plastic Metal to plastic SCRW TAP FLAT/PT 23 8F.XA313.8R0 Plastic to 4.0±0.5 Φ2.0±0.05 M2.5*8L B-ZN plastic PCB to plastic Plastic SCRW TAP CAP Metal to plastic Φ2.35±0.0 24 8F.WA314.8R0 5.0±1.0 M3*1.34P*8L B-ZN Plastic to plastic...

  • Page 72: Appendix 2-Physical Dimension Front View And Side View

    Appendix 2-Physical Dimension Front View and Side view Fig. 1 Physical Dimension Front View and Side view - 72 -...
  • Page 73 Fig. 2 Appearance Description - 73 -...

Table of Contents