BenQ M2700HD Service Manual
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BenQ M2700HD Service Manual

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See also: User Manual
Product Service Manual--Level 1
Service Manual for BenQ:
M2700HD
Applicable for All Regions
Version: 001
Date:2009/11/27
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 (November, 2009)
© Copyright BenQ Corporation 2009. All Right Reserved.

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Summary of Contents for BenQ M2700HD

  • 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 (November, 2009)

  • Page 2: Table Of Contents

    BenQ M2700HD Service Manual Content Index 1. About This Manual ............................2 1.1 Trademark ................................. 2 2. Precautions & Safety Notices .......................... 2 2.1 Safety Precaution ............................. 2 2.2 Product Safety Notice ............................2 2.3 Service Notes ..............................2 3. Product Overview ............................. 3 3.1 Power Supply ..............................

  • Page 3: About This Manual

    The following terms are trademarks of BenQ Corporation: BenQ Importance 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 “Safety Note” 2. Precautions & Safety Notices 2.1 Safety Precaution...

  • Page 4: Product Overview

    BenQ M2700HD Service Manual 3. Product Overview 3.1 Power Supply Items Condition Spec Note AC Input Voltage range Universal input full range 90~264Vac AC Input Voltage rating Universal input full range 100~240Vac AC input frequency range 90~264Vac 47~63Hz AC input frequency rating...

  • Page 5: Scan Range

    √ Sync polarity: (+) or (-) 50~76Hz 3.4 Support Timings BenQ customer preset Tmings are as below: P: Preset Mode NP: Non Preset Mode FS: Fail Save Mode(show “Out of Range”, but still can see picture) O: Out of Range(only show “Out of Range”, without picture )
  • Page 6 BenQ M2700HD Service Manual 1024x768 78.75 60.02 75.03 1024x768 94.50 68.68 85.00 1152x720 66.75 44.86 1152x864 94.50 63.85 70.01 1152x864 108.00 67.50 75.00 1152x864 119.651 77.09 85.00 1152x870 100.00 68.68 75.06 1152x900 92.94 61.80 65.95 1152x900 105.59 71.73 76.07 1280x720 74.25...

  • Page 7: Operational & Function Specification

    BenQ M2700HD Service Manual 1600x1200 202.50 93.75 75.00 1600x1200 229.50 106.25 85.00 1680x1050-R 119.00 64.67 59.88 1680x1050 146.25 65.29 59.95 1680x1050 82.306 1600x1280 171.75 79.5 59.9 1792X1344 203.25 83.57 59.9 1792X1344 257.75 105.290 75.00 1856X1392 217.25 86.485 59.934 1856X1392 277.5 74.918...

  • Page 8: Service Manual

    BenQ M2700HD Service Manual 240 nits (min) 300 nits (Typ)---For AUO Panel Brightness AUO Panel: 5ms (Typ.) 8ms (Max.) Response time (Tr +Tf ) OD: 2ms NTSC ratio Viewing angle (H/V) Hor:170°,Ver:160° (Typ.,CR≥10)--For AUO Analog (D-sub 15 pin);DVI-D;HDMI＊ Input interface...

  • Page 9: Lcd Characteristics

    BenQ M2700HD Service Manual 3.5.4 Environment Operating Specification 0°C to 50°C Temperature range Relative humidity 5% to 90% Altitude 0 to 10000 feet Storage -20°C to 60°C Temperature range Relative humidity 5% to 90% Altitude 0 to 30000 feet 3.5.6 Electrostatic discharge Requirements...

  • Page 10: User Controls

    BenQ M2700HD Service Manual 3.7 User Controls User’s hardware control definition: CONTROL KEY KEYS FUNCTION A. When OSD displays, press [MENU] to return to previous level menu B. When OSD isn’t shown on screen, press [MENU] to enter OSD interface [MENU] C.

  • Page 11: Pallet & Shipment

    BenQ M2700HD Service Manual √ Texture Polishing #10000 1.BEZEL: Polishing #10000 拋光 噴涂 2. MID BEZEL: MTI1010 Polishing #10000 Special Texture 3. BACKCOVER: Polishing #10000 4. STAND BACK Texture MT11010 5. BASE COVER Polishing #10000 6. FUNCTION KEY Polishing #10000 7.POWER BUTTON...

  • Page 12: Software / Firmware Upgrade Process

    BenQ M2700HD Service Manual Gross Dimension w/o Base Dimension w/ Base Net Weight (Kg) Weight(Kg) LxWxH (mm) LxWxH (mm) 512.39x348.35x163.35 4.9±0.3 Kg ( Net) 6.1±0.3Kg 512.39x348.35x99.63mm Package: Carton Interior Dimension (mm) Carton External Dimension (mm) LxWxH LxWxH 760X578X280mm 774X592X310mm 4 .Cosmetic / Appearance / Alignment Service 4.1 Software / Firmware Upgrade Process...
  • Page 13 BenQ M2700HD Service Manual D. When OSD displays, press [MENU] to return to previous level menu E. When OSD isn’t shown on screen, press [MENU] to enter OSD interface [MENU] F. Press [MENU] to enter Service Page When OSD isn’t shown on screen in Service Page Mode C.
  • Page 14 BenQ M2700HD Service Manual 0~100 Saturation 0~100 (1)VGA/DVI: can’t adjust (2)HDMI:YUV Domain can adjust, RGB Domain can’t adjust (3)Component/S-Video/Compositec can adjust Reset Color (YES/NO) (ON/OFF) Standard Sharpness can adjust 1. If Senseye Sharpness can’t Movie Demo set ON at adjust...
  • Page 15 BenQ M2700HD Service Manual HDMI RGB PC RGB(0~255)/ RGB(16~235) (RGB Default: RGB(0~255) Range Domain can adjust) Standard/Movie/Game/POP/Rock Audio Mode Standard (1) When EmbracingSound off, Audio Mode can’t adjust (2) When connect Line in/Line out/Earphone can’t adjust 0~100 Volume When Line Out at the back of monitor, Volume can’t adjust, OSD is 30;...
  • Page 16 BenQ M2700HD Service Manual DDC/CI (ON/OFF) HDMI source can choose/other source (ON/OFF) can’t choose Auto Source On in OSD, search automatically among Source Auto Search (ON/OFF) VGA/DVI/HDMI1/HDMI2, S-Video/Composite/Component on or off can’t adjust Input Current Resolution 1080P (2)1920 Information x1080...
  • Page 17 BenQ M2700HD Service Manual Color 1. Do “Auto Color Balance” at 1920×1080@60Hz, 32gray shades Temperature 2. Measure color temperature, check it complies with the Chroma Signal Generator following temperature : and color analyzer 5800K x=0.326 +/- 0.02, y = 0.342+/-0.02 6500K x = 0.313 +/- 0.02, y = 0.329+/-0.02...

  • Page 18: Level 2 Disassembly/Assembly/Circuit Board/Standard Parts Replacement

    BenQ M2700HD Service Manual 5. Level 2 Disassembly/Assembly/Circuit Board/Standard Parts Replacement 5.1 Exploded Diagram...

  • Page 19: Assembly Block

    BenQ M2700HD Service Manual 5.2 Assembly Block PCBA I/F BOARD *1 BOLT,#4-40x11.8,Ni *4 PCBA Power *1 M3*6, *11 ASSY CHASSIS*1 CHASSIS *1 EMI Gasket L10*W10*H5 *1 GASKET, ,L15*W15*H15 *1 PANEL *1 HRN LVDS FFC *1 FOIL,AL.,DOUBLE COND.,140x40x0.07mm LE17B4 *2 FOIL,AL,MYLAR,100*30*0.09MM *2...
  • Page 20 BenQ M2700HD Service Manual Assemble the panel with front-bezel Assemble chassis & Plug in the LVDS Assemble the IR BD Plug in the lamp lines...
  • Page 21 BenQ M2700HD Service Manual Stick the foil Plug in the speaker line Assemble the keypad &keypad cable Assemble USB Cable& USB BD...
  • Page 22 BenQ M2700HD Service Manual Connect the USB cable &KP Cable with IF BD Assemble the back-cover with screw 11 Assemble the stand screw the stand with 4pcs screws...
  • Page 23 BenQ M2700HD Service Manual Assemble the hinge-cover...

  • Page 24: Disassembly Block

    BenQ M2700HD Service Manual 5.3 Disassembly Block LP2785 LCD Monitor BASE *1 ASSY STAND *1 STAND FRONT *1 BASE PLATE*1 STAND BACK *1 RUBBER *5 HINGE *1 BACK COVER*! LOGO BACK*1 ASSY,BACK COVER *1 FUNCTION BUTTON *1 Shielding*1 Front cover *1 SCREW C .T3*8*1...
  • Page 25 BenQ M2700HD Service Manual Remove 4pcs screws Remove the stand Disassemble the screw in the corners of back-cover Disassemble the three edge of front bezel and Remove the back cover...
  • Page 26 BenQ M2700HD Service Manual Disconnect the USB cable &KP Cable with IF Disassemble USB Cable& USB BD Remove the keypad &keypad cable Pull out the speaker Cable...
  • Page 27 BenQ M2700HD Service Manual Remove the foil Pull out the lamp lines Disassemble the IR BD Disassemble chassis & Plug in the LVDS...
  • Page 28 BenQ M2700HD Service Manual Remove the panel...

  • Page 29: Block Diagram

    5. Circuit Board and Standard Parts Replacement 5.1. Block diagram Power Board...
  • Page 33 IF Board...
  • Page 43 Keypad...
  • Page 44 IF board layout Keypad board layout PI board layout...

  • Page 45: Circuit Operation Theory

    5.5 Circuit Operation Theory Operation theory AC Current Input Circuit P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input voltage is from 90v to 264V. R801 and R802 joined between two inputting main circuit to prevent man from shock.D808 rectify AC in put to DC voltage, L801, L806,L803, C801, c802, C803, C804 ,c813, c814 formed a low frequency filter net for EMI and EMC.

  • Page 46: I/F Circuit

    Vcc pin capacitor is charged. When the Vcc pin voltage reaches approximately 16.5V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the duty cycle of the MOSFET from zero to the maximum value over approximately 5ms. a stably output voltage Will be increase about 20ms later, and then feedback a continue current through the IC803 which control the output of the PWM IC.
  • Page 47 - Signal TTL horizontal sync. (Hsync) inputs via CN102 #13, and then clamped by ZD101 Zener, passes through FB101,R169, and then goes into IC U111 (scaler) #29. - CN102#5 is defined as cable detect pin, this detector realize passes through R290 Pull high, go into U111#225.

  • Page 48: Trouble Shooting Guide

    5.7 Trouble Shooting Guide Inverter trouble shooting Backlight can’t be turned on No raster? LED Green? Backlight can’t be Is there 5Vdc voltage Check power on pin2 of IC501? supply Is there high-level voltage on Is Ok R505? Check I/F board pin6 of IC501? R505 open Are connected rightly...
  • Page 49 No Power & Power LED Off No power Check Check primary Check IC802, circuit if rectifier voltage C807, T801, Check F801, P801, RT,801,D808 Check pin6 of IC806 CheckC823,D813,C84 voltage about 16V Check pin2 of IC802 Check primary OVP, voltage about 3V OLP and secondary Check R845, R846, Check pin1 of IC806...
  • Page 50 Output power is unstable Unstable power Check sampling Check R827, Circuit R829, R830, repair R827, R829, R830 R833 Check the C Check the R pin pin voltage of Change voltage of IC804 IC804 if 3V IC803 Check R826, R828 Check pin2 Check D813 ,C823 if of IC806 short...
  • Page 51 Black Screen Black Screen Check power supply Power Fail Pin1, 2 ,6 ,7of CN101 Check power supply Check U101,U102,IC101 supply of U111 Check Reset Check R251,R252,C248 Of U111 Check Crystal of U111 Check: X102 Check CCFL Enable Check pin14 of Inverter Fail CN101 of U111...
  • Page 52 White Screen White Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check VLCD Check LVDS Panel Fail Is 5V? Signals Check Panel Enable Check the HW Reset U111 Fail Of U111 . Of U111 Check R107, R109, R110 Q101, Q104 Check the pins Of U111...
  • Page 53 Bad Screen Bad Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check Crystal Of U111 Check: X102 Check the communication of U111 and external circuit Check :Scaler_SCLK, Check the Pins of Reset The U111...

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