BenQ E2220HD Service Manual
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BenQ E2220HD Service Manual

21.5 lcd color monitor
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See also: User Manual
Applicable Country & Regions: USA & Canada
Service Manual for BenQ:
LCD E2220HD
(D-SUB +DVI-D +HDMI +
USB + Glossy black Bezel
with silver for mid frame)
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 (July, 2009)
©
Copyright BenQ Corporation 2009. All Right Reserved.
Version: 2nd
Date:09-02-2009
1

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Summary of Contents for BenQ E2220HD

  • 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 (July, 2009) ©...

  • Page 2: Table Of Contents

    21.5″ LCD Color Monitor BenQ E2220HD 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

    21.5″ LCD Color Monitor BenQ E2220HD 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 21.5″ LCD Color Monitor BenQ E2220HD 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

    21.5″ LCD Color Monitor BenQ E2220HD 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

    21.5″ LCD Color Monitor BenQ E2220HD 3. General Description This new LCD (Liquid Crystal Display) monitor BenQ E2220HD offers numerous features and functions, for example: TFT display (Thin Film Transistor; active matrix) Minimal space requirements thanks to slim casing Optimum ergonomic characteristics (totally distortion-free, excellent picture definition and color purity right into...

  • Page 8: Product Overview

    21.5″ LCD Color Monitor BenQ E2220HD 5. Product Overview 5.1 Monitor Specifications E2220HD D-sub (include component source)+ DVI-D + HDMI Panel Type (TN / VA / IPS) Panel Size 21.5"W Display Area 476.64 (H) x 268.11 (V) Max. Resolution 1920 x 1080 Pixel Pitch 0.248 (per one triad) x 0.248...
  • Page 9 21.5″ LCD Color Monitor BenQ E2220HD Voltage Rating AC: 100~240V (Built-in) Power-On Mode Power Supply Standby Mode <1W Power Off Mode <0.5W Chassis Colors (proposal A) Glossy black (silver for mid frame), detail refer to artwork Brown Carton with at least C flute (A flute CTN for BQjp...

  • Page 10: Packing

    21.5″ LCD Color Monitor BenQ E2220HD 5.2 Packing When packing the monitor into the carton, please follow the pictures as below. 1. Using the EPE bag to pack the monitor without base. Note: The four corners of the EPE bag can not be stretched.
  • Page 11 21.5″ LCD Color Monitor BenQ E2220HD 3. Putting the base, user manual and D-SUB cable in the position as the picture shows above. D-Sub cable pulled out of this hole 4. Putting the monitor and accessories into the carton. Power cord...

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

    21.5″ LCD Color Monitor BenQ E2220HD 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 21.5″ LCD Color Monitor BenQ E2220HD ISP setting: 1. Double click “Mstar ISP Utility V4.3.4” 2. Click “Read” Click Read 3. Click “Read” to read MCU file. Read MCU file MCU file...
  • Page 14 21.5″ LCD Color Monitor BenQ E2220HD 4. Check the “Checksum” and the “File Start and End Address” Checksum is ok File start and end address is ok 5. Click “Config” Write speed setting 6. Click “connect”, if appears the dialog “Can’t Entry ISP Mode”, then click “Dis Con” and then click connect again.
  • Page 15 21.5″ LCD Color Monitor BenQ E2220HD Program Writing 1. Click “Auto’ Must select the File Area 2. Click “Run” to start writing Writing… 3. Write over display “PASS”. The end display “Pass”...

  • Page 16: Ddc Instruction

    21.5″ LCD Color Monitor BenQ E2220HD 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 17 21.5″ LCD Color Monitor BenQ E2220HD 4. Take analog DDC write for example, as follow a. Double-click ,appear as follow:...
  • Page 18 21.5″ LCD Color Monitor BenQ E2220HD b. Click “Loadfile”, it will show the picture as follow: c. Click “OK”, it will show the picture as follow:...
  • Page 19 21.5″ LCD Color Monitor BenQ E2220HD d. Key in the same 13 numbers in the Input SN and Verify SN, e. Click “Program”, when the analog DDC Write complete, it will show the picture as follow:...
  • Page 20 21.5″ LCD Color Monitor BenQ E2220HD The interface of HDMI DDC writing is as follow: Note: The way of HDMI DDC Writing is the same as analog and DVI.
  • Page 21 21.5″ LCD Color Monitor BenQ E2220HD E2220HD EDID Analog 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ----------------------------------------------- 00| 00 FF FF FF FF FF FF 00 09 D1 12 79 45 54 00 00...
  • Page 22 1600 x 900 @ 60Hz 1680 x 1050 @ 60Hz 1920 x 1080 @ 60Hz <-Detailed Timing Descriptions :-> FC (Monitor Name): BENQ E2220HD FD (Monitor Limits): Min. V. rate: 50 Hz Max. V. rate: 76 Hz Min. H. rate: 24 KHz Max.
  • Page 23 21.5″ LCD Color Monitor BenQ E2220HD Digital 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ----------------------------------------------- 00| 00 FF FF FF FF FF FF 00 09 D1 13 79 45 54 00 00...
  • Page 24 1600 x 900 @ 60Hz 1680 x 1050 @ 60Hz 1920 x 1080 @ 60Hz <-Detailed Timing Descriptions :-> FC (Monitor Name): BENQ E2220HD FD (Monitor Limits): Min. V. rate: 50 Hz Max. V. rate: 76 Hz Min. H. rate: 24 KHz Max.
  • Page 25 21.5″ LCD Color Monitor BenQ E2220HD HDMI 1 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 13 79 45 54 00 00...
  • Page 26 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 E2220HD FF (Monitor SN): 23121323112...
  • Page 27 21.5″ LCD Color Monitor BenQ E2220HD Extension Flag: 01 Block0 Checksum: A2 ------------------------------------------------------- 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 28 21.5″ LCD Color Monitor BenQ E2220HD 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 29 21.5″ LCD Color Monitor BenQ E2220HD Block 0: EDID Structure Version/Revision: 01 03 <-Vendor/Product Identification :-> ID Manufacturer Name: BNQ ID Product Code: 7913 ID Serial Number: 21573 Week of Manufacture: Year of Manufacture: 2001 <-Basic Display Parameters/Features :-> Video i/p definition: Digital Max.
  • Page 30 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 E2220HD FF (Monitor SN): 23121323112 Extension Flag: 01 Block0 Checksum: A2 -------------------------------------------------------...
  • Page 31 21.5″ LCD Color Monitor BenQ E2220HD 720(1440) x 576 I 50Hz 16:9 640 x 480 P 59.94/60Hz 4:3 1920 x 1080 I 50Hz 16:9 720(1440) x 576 I 50Hz 4:3 1920 x 1080 P 50Hz 16:9 <-Audio Short Block Description :->...

  • Page 32: Adjustment / Alignment Procedure

    21.5″ LCD Color Monitor BenQ E2220HD Adjustment / Alignment Procedure The control panel 1. AUTO: Adjusts vertical position, phase, horizontal position and pixel clock automatically. 2. MENU: Activates OSD main menu and return to the previous menu or exit OSD.
  • Page 33 21.5″ LCD Color Monitor BenQ E2220HD Mode hot key Press the ▼ key continually to switch between the modes for the main window, including Standard, Movie, Game, Photo, sRGB, and ECO. The setting will take effect immediately. Input hot key (not available for analog-only models) Press the ENTER key to toggle between different PC video signal inputs that may be connected to your monitor.
  • Page 34 21.5″ LCD Color Monitor BenQ E2220HD Use the ▲ (up) or ▼ (down) keys to highlight a menu item, and press the ENTER key to enter the Menu item settings. The OSD menu languages may differ from the product supplied to your region.
  • Page 35 21.5″ LCD Color Monitor BenQ E2220HD Picture menu 1. Press the MENU key to display the main menu. 2. Press the ▲ or ▼ keys to select PICTURE and then press the ENTER key to enter the menu. 3. Press the ▲ or ▼ keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 36 21.5″ LCD Color Monitor BenQ E2220HD Allows video and still photographs to be Normal viewed with natural coloring. This is the factory default color. Applies a cool tint to the image and is Press the ▲ or ▼ keys Bluish factory pre-set to the PC industry standard to select this option.
  • Page 37 21.5″ LCD Color Monitor BenQ E2220HD 1. Press the MENU key to display the main menu. 2. Press the ▲ or ▼ keys to select PICTURE ADVANCED and then press the ENTER key to enter the menu. 3. Press the ▲ or ▼ keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 38 21.5″ LCD Color Monitor BenQ E2220HD • Full - Scales the input image to fill the • Full screen. Ideal for 16:9 aspect images. • Aspect • Aspect - The input image is displayed without geometric distortion filling as Or when the signal much of the display as possible.
  • Page 39 21.5″ LCD Color Monitor BenQ E2220HD Audio menu 1. Press the MENU key to display the main menu. 2. Press the ▲ or ▼ keys to select AUDIO and then press the ENTER key to enter the menu. 3. Press the ▲ or ▼ keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 40 21.5″ LCD Color Monitor BenQ E2220HD System menu 1. Press the MENU key to display the main menu. 2. Press the ▲ or ▼ keys to select SYSTEM and then press the ENTER key to enter the menu. 3. Press the ▲ or ▼ keys to move the highlight to a menu item and then press the ENTER key to select that item.
  • Page 41 21.5″ LCD Color Monitor BenQ E2220HD • Russian • Swedish • Portuguese Adjusts the horizontal position of H. Position 0 to 100 the OSD menu. Adjusts the vertical position of the V. Position 0 to 100 OSD menu. Press the▲ or ▼keys to •...
  • Page 42 21.5″ LCD Color Monitor BenQ E2220HD When this function is activated, HMDI port will be in the input auto Press the ENTER key to select HDMI Auto select loop. Otherwise, HDMI can this option. Press the ▲ or ▼ Switch only be selected by input select or keys to change the setting.
  • Page 43 21.5″ LCD Color Monitor BenQ E2220HD 1280 x 720 44.77 59.86 74.5 1280 x 720 56.46 74.78 95.75 1280 x 960 60.00 60.00 108.000 VESA 1280 x 1024 63.98 60.02 108.000 VESA 1280 x 1024 79.98 75.02 135.000 VESA 1360 x 768 47.7...
  • Page 44 HDMI HDCP: To enable the hot plug pin detection. (HDMI port default: on) DVI HDCP: To disable the hot plug pin detection. (DVI port default: off) 8. Add BenQ logo on/off item, the default is “on” 9. Add the auto power on item, the default is “off ”...

  • Page 45: Level 2 Circuit Board And Standard Parts Replacement

    21.5″ LCD Color Monitor BenQ E2220HD Level 2 Circuit Board and Standard Parts Replacement Product Exploded View E2220HD Part NO Description QTY. Remark A34G1354ADPB1B0130 Bezel L215WA-9BENQ2 KEPC9QBF KEY BOARD A33G0707ADP 1L0100 FUNCTION BUTTON A33G0708ADP 1L0100 BUTTON COVER A33G0709BCNA1C0100 POWER BUTTON...
  • Page 46 21.5″ LCD Color Monitor BenQ E2220HD A15G0818101 MAINFRAME A85G0190101 POWER SHIELD Q11G0025 1 PCB SUPPORT A34G1357BCN 1B0100 MIDDLE FRAME 078G 511 2 V SPEAKER 4 OHM 2W 750GLU215H1024M0BQ PANEL M215HW01 V00A SH AUO 0G1G1030 6120 SCREW Q3 X 6 Power PCB to mainframe...

  • Page 47: Six Angles' View

    21.5″ LCD Color Monitor BenQ E2220HD Six angles’ view...

  • Page 48: Product Disassembly

    21.5″ LCD Color Monitor BenQ E2220HD Product Disassembly Step 1: Remove the stand-base ASSY a. 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 hinge cover.
  • Page 49 21.5″ LCD Color Monitor BenQ E2220HD b. Disconnect the connectors to remove the rear cover as follow: Secure the cable with the tape to avoid jamming Step 3: Remove the bezel a. Disconnect the connectors and release the screw to remove the key board from the bezel.
  • Page 50 21.5″ LCD Color Monitor BenQ E2220HD b. Remove the speakers. Secure the audio cable Secure the audio cable and the key with the leafing aluminum cable with the leafing aluminum Step 4: Remove the Panel a. Remove the leafing aluminum and disconnect the Lamp connectors.
  • Page 51 21.5″ LCD Color Monitor BenQ E2220HD b. Remove the tapes. The leafing aluminum can’t overtop The leafing aluminum can’t overtop the edge of the panel PC board. the edge of the panel PC board. c. Disconnect the LVDS Cable connection.
  • Page 52 21.5″ LCD Color Monitor BenQ E2220HD Step 5: Remove the boards Release the screws to remove the power board, main board and USB board. The tape is below the FFC cable. Place the cables in the slot of the mainframe and secure...

  • Page 53: Block Diagram

    21.5″ LCD Color Monitor BenQ E2220HD Block Diagram Main Board USB Board Control LCD Interface Crystal 14.318MHz Key Board Control (X401) (CN605) (CN408) (CN401) EEPROM AT24C04BN Scalar IC TSUMU58KDT-LF-1 (U403)   (Include ADC, OSD, MCU) (U401)   Flash Memory SST25LF020A-33-4C-SAE...

  • Page 54: Power Board

    21.5″ LCD Color Monitor BenQ E2220HD Power Board Input AC Source EMI Filter Inrush 110v / 60 Hz ~ Rectification Circuit Prevention 240v / 50 Hz Main Output (+5V) To Main Board & Transformer AUDIO Diode Rectifier Fuse For OLP...

  • Page 55: Schematic Diagram

    21.5″ LCD Color Monitor BenQ E2220HD Schematic Diagram Main Board VCC3.3 CN701 +5V1 R701 R713 10K1/16W 0R05 1/4W R702 100R 5% 1/16W Adj_BACKLIGHT {4} ON/OFF R714 VCC3.3 0R05 1/4W C715 100pF 50V VCC3.3 R703 10K1/16W CONN C702 C701 100uF 25V...
  • Page 56 21.5″ LCD Color Monitor BenQ E2220HD RED+ FB101 0R05OHM1/16W R101 56 OHM 1/16W C101 47N16V RED- R116 22 OHM 1/10W GREEN+ FB102 0R05OHM1/16W R102 56 OHM 1/16W C102 47N16V GREEN- R139 100 OHM 1/10W BLUE+ FB103 0R05OHM1/16W R103 56 OHM 1/16W...
  • Page 57 21.5″ LCD Color Monitor BenQ E2220HD VDDP VCC3.3 FB402 VCC3.3 FB404 AVDD_DAC VCC1.2 FB405 VDDC {2,6} VCC3.3 VCC3.3 FB403 AVDD_33 {2,6} VCC3.3 VCC1.2 120 OHM 120 OHM 120 OHM C408 C404 C405 C406 C407 C410 C414 C415 C416 C417 {2,6} VCC3.3...
  • Page 58 21.5″ LCD Color Monitor BenQ E2220HD CN408 LVB0M RXO0- LVB0P RXO0+ LVB1M RXO1- LVB1P RXO1+ LVB2M RXO2- LVB2P RXO2+ LVBCKM RXOC- PA[0..9] LVBCKP RXOC+ PA[0..9] LVB3M RXO3- LVB3P RXO3+ LVA0M RXE0- LVA3P LVA0P RXE0+ LVA3M LVACKP LVA1M RXE1- LVACKM VLCD...
  • Page 59 21.5″ LCD Color Monitor BenQ E2220HD DVI_5V R573 CN501 0R05OHM1/16W DVI_5V VSY NC R577 100R 5% 1/16W SY NC GND DVI_DET {4} R502 100R 5% 1/16W DVI_SCL DDC SCL R503 100R 5% 1/16W DVI_SDA DDC SDA R504 10K1/16W R505 10K1/16W...
  • Page 60 21.5″ LCD Color Monitor BenQ E2220HD +5V_AUDIO R647 1K 1/10W +5V1 +5V_AUDIO R649 4.7K1/16W FB601 R648 4.7K1/16W Q605 OUT-L R604 0R05OHM1/16W C628 0.47uF 10V LINEOUT_JACK_L VOLUME C639 120 OHM 2N3904S-RTK/PS 1UF 10V Line out C615 C635 C612 OUT-R R606 0R05OHM1/16W C629 0.47uF 10V...
  • Page 61 21.5″ LCD Color Monitor BenQ E2220HD Power Board 100 OHM 1/4W R918 C912 1N 500V 100 OHM 1/4W R919 100 OHM 1/4W R920 D906 SP10150 L904 INVERTER & USB +16V =2.5A 3.5uH R946 R947 ZD902 C917 820 OHM 2W +-5%...
  • Page 62 21.5″ LCD Color Monitor BenQ E2220HD +16V Q805 R817 APM4548AKC 10 OHM 1/8W G1 D1 ZD802 GDZJ5.6B R803 10 OHM 1/8W R816 5.1K 1/8W 80GL24T 23 DN ZD803 C803 GDZJ5.6B R804 680uF25V PT801 C819 R802 5.1K 1/8W POWER X'FMR 56pF3KV...
  • Page 63 21.5″ LCD Color Monitor BenQ E2220HD CN652 IN-R IN-L OUT-R OUT-L A GND A GND Wire Harness R655 0R05OHM1/8W A GND CN651 R651 100 OHM 1/10W OUT-L1 OUT-L R652 100 OHM 1/10W Line out OUT-R1 OUT-R IN-L1 R653 100 OHM 1/10W...
  • Page 64 21.5″ LCD Color Monitor BenQ E2220HD USB Board VBUS0 Power Regulator USB5V USB3.3V FB752 U751 AP1117E33LA VBUS0 R752 CN752 VOUT 100KOHM 5% 1/16W 120 OHM U752 USB2514-AEZG Upstream C752 C753 C754 C751 L752 UGND USBUP_DM VBUS_DET 100UF25V 100N 16V 100N 16V...
  • Page 65 21.5″ LCD Color Monitor BenQ E2220HD Earphone Board VBUS3 CN762 CONN C7101 0.1uF50V CN761 UGND UGND DM33 VBUS4 DP33 from Bottom USB Board CN763 DM44 CONN DP44 C7102 0.1uF50V CONN UGND UGND CN662 HP_R from MB HP_SENSE HP_L CONN AGND...
  • Page 66 21.5″ LCD Color Monitor BenQ E2220HD Key Board CN002 LED_GRN# LED_RED# POWER CONN CN001 R003 1.8K1/10W R002 3K 1/10W 1% LBADC1 LBADC2 R005 3K 1/10W 1% DC_POWERON R004 1.8K1/10W LED_GRN# LED_RED# R006 1.8K1/10W POWER R007 3K 1/10W 1% C003 C004...
  • Page 67 21.5″ LCD Color Monitor BenQ E2220HD CN021 CONN LED_GRN# LED_RED# POWER SW021 C021 0.1uF 50V ZD021 NC/UDZSNP5.6B C022 C023 0.1uF 50V 0.1uF 50V T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Size G3559-C-X-X-1-090612 TPV MODEL 絬...

  • Page 68: Troubleshooting Guide

    21.5″ LCD Color Monitor BenQ E2220HD 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 69 21.5″ LCD Color Monitor BenQ E2220HD If the LED is illuminated in green and there is a message “Out of Range” on the screen, this means you are using a display mode that this monitor does not support, please change the setting to one of the supported mode.
  • Page 70 21.5″ LCD Color Monitor BenQ E2220HD 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 71 21.5″ LCD Color Monitor BenQ E2220HD (2) No picture No picture Check if the Pin 7, 8 of CN701 is 5V input Check power board Measure U702 Pin2=3.3V Measure U704 Pin2=1.2V Replace U702 and U704 X401 oscillate waveforms are normal...
  • Page 72 21.5″ LCD Color Monitor BenQ E2220HD (3) White screen White Screen Measure Q702 base X401 oscillate is low level? waveform is normal Replace X401 Check Q701, Q702 is broken Check U401 or CN408 solder? Replace U401 Check Correspondent Check reset circuit of component.
  • Page 73 21.5″ LCD Color Monitor BenQ E2220HD Power Board (1). No power Check CN902 PIN4, 5 = 5V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) Check bridge rectified circuit and F901 circuit...
  • Page 74 21.5″ LCD Color Monitor BenQ E2220HD (2). W / LED, No Backlight Check Inverter input =16V 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 75 21.5″ LCD Color Monitor BenQ E2220HD 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 76: Pcb Layout

    21.5″ LCD Color Monitor BenQ E2220HD PCB LAYOUT Main Board...
  • Page 77 21.5″ LCD Color Monitor BenQ E2220HD...
  • Page 78 21.5″ LCD Color Monitor BenQ E2220HD Power Board...
  • Page 79 21.5″ LCD Color Monitor BenQ E2220HD...
  • Page 80 21.5″ LCD Color Monitor BenQ E2220HD...
  • Page 81 21.5″ LCD Color Monitor BenQ E2220HD USB Board...
  • Page 82 21.5″ LCD Color Monitor BenQ E2220HD Key Board...

  • Page 83: Appendix 1 – Screw List / Torque

    21.5″ LCD Color Monitor BenQ E2220HD Appendix 1 – Screw List / Torque (HI9ASBMK9XBQPN) Part No. Type Description Quantity Torque 0G1G1030 6120 Q3 * 6 FOR POWER BOARD & MAINFRAME 6±1kgf.cm 0M1G 930 6120 Q3 * 6 FOR MAIN BOARD PCB TO MAINFRAME 6±1kgf.cm...

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