Service Manual
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... Cosmetic / Appearance / Alignment Service 10 Level 1 Cosmetic / Appearance / Alignment Service 11 Level 1 Cosmetic / Appearance / Alignment Service 12 Visual Inspection & Cleaning...12 Software/Firmware Upgrade Process ...12 Adjustment / Alignment Procedure ...20 Level 2 Circuit Board and Standard Parts Replacement 31 Product Exploded View ...31 Six angles' view ...31 Product Disassembly...32 Block Diagram ...35 Schematic Diagram ...37 Troubleshooting Guide ...46 PCB LAYOUT ...53 Appendix - 24" LCD Color Monitor Content Index BenQ E2400HD Abbreviations & Acronyms...3 1.
... Cosmetic / Appearance / Alignment Service 10 Level 1 Cosmetic / Appearance / Alignment Service 11 Level 1 Cosmetic / Appearance / Alignment Service 12 Visual Inspection & Cleaning...12 Software/Firmware Upgrade Process ...12 Adjustment / Alignment Procedure ...20 Level 2 Circuit Board and Standard Parts Replacement 31 Product Exploded View ...31 Six angles' view ...31 Product Disassembly...32 Block Diagram ...35 Schematic Diagram ...37 Troubleshooting Guide ...46 PCB LAYOUT ...53 Appendix - 24" LCD Color Monitor Content Index BenQ E2400HD Abbreviations & Acronyms...3 1.
Service Manual
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...Frequency Control: control signal used to tune to the correct frequency B BenQ BenQ Corporation BTSC Broadcast Television System Committee C CPU Central Process Unit CVBS Composite Video Blanking and Synchronisation D DLP Digital Light Processing / Texas Instruments® DMD Digital Micromirror Device DRAM Dynamic RAM DVI Digital Video Interface DVI-I Digital Video Interface-Integrated E EEPROM Electrically Erasable and Programmable Read Only Memory F FLASH FLASH memory G G-TXT Green Teletext H HDMI High Definition Multimedia Interface, digital audio and video...
...Frequency Control: control signal used to tune to the correct frequency B BenQ BenQ Corporation BTSC Broadcast Television System Committee C CPU Central Process Unit CVBS Composite Video Blanking and Synchronisation D DLP Digital Light Processing / Texas Instruments® DMD Digital Micromirror Device DRAM Dynamic RAM DVI Digital Video Interface DVI-I Digital Video Interface-Integrated E EEPROM Electrically Erasable and Programmable Read Only Memory F FLASH FLASH memory G G-TXT Green Teletext H HDMI High Definition Multimedia Interface, digital audio and video...
Service Manual
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... mixing levels of R, G, and B, all colours (Y/C) are ROM Read Only Memory S SDA Data signal on I2C bus SDRAM Synchronous DRAM SW Sub Woofer / Software T THD Total Harmonic Distortion V VGA Video Graphics Array Y YPbPr Component video (Y= Luminance, Pb/ Pr= Colour difference signals B-Y and R-Y, other amplitudes w.r.t. 24" LCD Color Monitor P BenQ E2400HD PC Personal Computer PCB Printed Circuit Board (or PWB) R RC Remote Control transmitter RGB Red, Green, and Blue.
... mixing levels of R, G, and B, all colours (Y/C) are ROM Read Only Memory S SDA Data signal on I2C bus SDRAM Synchronous DRAM SW Sub Woofer / Software T THD Total Harmonic Distortion V VGA Video Graphics Array Y YPbPr Component video (Y= Luminance, Pb/ Pr= Colour difference signals B-Y and R-Y, other amplitudes w.r.t. 24" LCD Color Monitor P BenQ E2400HD PC Personal Computer PCB Printed Circuit Board (or PWB) R RC Remote Control transmitter RGB Red, Green, and Blue.
Service Manual
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... panel any maintenance or service, the engineer MUST read through reading the Service Manual. 24" LCD Color Monitor 1. About This Manual BenQ E2400HD The purpose of using the menu and some counties also require this model through carefully. The method of firmware updated, the way of Service Manual is better for easy access place. 2.1 RoHS (2002/95/EC) Requirements - If the original parts are not RoHS complaints, the replacement parts...
... panel any maintenance or service, the engineer MUST read through reading the Service Manual. 24" LCD Color Monitor 1. About This Manual BenQ E2400HD The purpose of using the menu and some counties also require this model through carefully. The method of firmware updated, the way of Service Manual is better for easy access place. 2.1 RoHS (2002/95/EC) Requirements - If the original parts are not RoHS complaints, the replacement parts...
Service Manual
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... unsafe. 4. General Description This new LCD (Liquid Crystal Display) monitor BenQ E2400HD offers numerous features and functions, for example: ● TFT display (Thin Film Transistor; Use proper safety devices to high temperatures such as throwing into the corners) ● high degree of brightness and good contrast 6 Do not disassemble any parts, please confirming the RoHS requirement before opening the product's cabinet. 7. 24" LCD Color Monitor complaints.
... unsafe. 4. General Description This new LCD (Liquid Crystal Display) monitor BenQ E2400HD offers numerous features and functions, for example: ● TFT display (Thin Film Transistor; Use proper safety devices to high temperatures such as throwing into the corners) ● high degree of brightness and good contrast 6 Do not disassemble any parts, please confirming the RoHS requirement before opening the product's cabinet. 7. 24" LCD Color Monitor complaints.
Service Manual
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...sub VGA connector, 24-pin DVI connector and 19-pin HDMI connector, also supports VESA DPMS power management and plug & play capability ● power management for the 24" MICROPROCESSOR based Multi-mode supported high resolution color LCD monitor. This is , the clearest picture. that is called "Native Resolution" or maximal resolution - This monitor can occur with OSD control to drive a pair of speakers. Lower resolutions are 2 levels of service: Level 1: Cosmetic / Appearance / Alignment Service Level 2: Circuit Board or Standard Parts Replacement 7 24" LCD Color Monitor ●...
...sub VGA connector, 24-pin DVI connector and 19-pin HDMI connector, also supports VESA DPMS power management and plug & play capability ● power management for the 24" MICROPROCESSOR based Multi-mode supported high resolution color LCD monitor. This is , the clearest picture. that is called "Native Resolution" or maximal resolution - This monitor can occur with OSD control to drive a pair of speakers. Lower resolutions are 2 levels of service: Level 1: Cosmetic / Appearance / Alignment Service Level 2: Circuit Board or Standard Parts Replacement 7 24" LCD Color Monitor ●...
Service Manual
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... Overview 5.1 Monitor Specifications BenQ E2400HD LCD Panel Panel Type Size Pixel pitch Display Area Viewable angle Contrast Dynamic contrast ratio Brightness Response time Video Input Synchronization H-Frequency V-Frequency Display Colors Image diagnostics Controls Max. 24" LCD Color Monitor Service Web Site eSupport URL:http://esupport.benq.com 5. W.) TN 24" 0.277mm(H) × 0.277mm(V) 531.36 (H) x 298.89 (V) 170, 160 (CR>10) 1000:1 10000: 1 (typical) 300 cd/m2 5ms(typical) 2 ms (GTG) RGB analog 0.7 Vpp/75 Ohm positive Digital: DVI-D, HDMI TTL separate signal connection 15-pin...
... Overview 5.1 Monitor Specifications BenQ E2400HD LCD Panel Panel Type Size Pixel pitch Display Area Viewable angle Contrast Dynamic contrast ratio Brightness Response time Video Input Synchronization H-Frequency V-Frequency Display Colors Image diagnostics Controls Max. 24" LCD Color Monitor Service Web Site eSupport URL:http://esupport.benq.com 5. W.) TN 24" 0.277mm(H) × 0.277mm(V) 531.36 (H) x 298.89 (V) 170, 160 (CR>10) 1000:1 10000: 1 (typical) 300 cd/m2 5ms(typical) 2 ms (GTG) RGB analog 0.7 Vpp/75 Ohm positive Digital: DVI-D, HDMI TTL separate signal connection 15-pin...
Service Manual
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... d. VGA cable x1 2. Avoid using any kind into this product. Software ISP SN Alignment kits The kit contents: a. When do the part, need the tools as follows: 12 c. Install the "PORT95NT.EXE", and restart the computer. Clean the LCD monitor surface with a lint-free, non-abrasive cloth. Software/Firmware Upgrade Process 1. Microsoft operation system Windows 95/98/2000/XP. 24" LCD Color Monitor Level 1 Cosmetic / Appearance / Alignment Service Visual Inspection & Cleaning BenQ...
... d. VGA cable x1 2. Avoid using any kind into this product. Software ISP SN Alignment kits The kit contents: a. When do the part, need the tools as follows: 12 c. Install the "PORT95NT.EXE", and restart the computer. Clean the LCD monitor surface with a lint-free, non-abrasive cloth. Software/Firmware Upgrade Process 1. Microsoft operation system Windows 95/98/2000/XP. 24" LCD Color Monitor Level 1 Cosmetic / Appearance / Alignment Service Visual Inspection & Cleaning BenQ...
Service Manual
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Picture Advanced 4. Audio 5. There are four main OSD menus: 1. Picture 3. Press the MENU key to enter the Menu item settings. 20 System Use the or keys to highlight a menu item, and press the ENTER key to display the following main OSD menu. Display 2. 24" LCD Color Monitor BenQ E2400HD Adjustment / Alignment Procedure Adjusting the Picture You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor.
Picture Advanced 4. Audio 5. There are four main OSD menus: 1. Picture 3. Press the MENU key to enter the Menu item settings. 20 System Use the or keys to highlight a menu item, and press the ENTER key to display the following main OSD menu. Display 2. 24" LCD Color Monitor BenQ E2400HD Adjustment / Alignment Procedure Adjusting the Picture You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor.
Service Manual
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... 63 Adjusts the horizontal position of the screen image. Adjusts the vertical position of the screen image. Not applicable to a digital input signal. 21 Range 0 to 100 0 to 100 0 to 100 0 to adjust the value. Position Pixel Clock Phase Function Operation Optimizes and adjusts the screen Press the ENTER settings automatically for this AUTO key is a 'hot-key' for you. Not applicable to the previous menu, press the MENU button. Adjusts the pixel clock phase timing to display...
... 63 Adjusts the horizontal position of the screen image. Adjusts the vertical position of the screen image. Not applicable to a digital input signal. 21 Range 0 to 100 0 to 100 0 to 100 0 to adjust the value. Position Pixel Clock Phase Function Operation Optimizes and adjusts the screen Press the ENTER settings automatically for this AUTO key is a 'hot-key' for you. Not applicable to the previous menu, press the MENU button. Adjusts the pixel clock phase timing to display...
Service Manual
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... lightness. The function is not available for use when Dynamic Contrast is on Adjusts the degree of image. Press ENTER to the previous menu, press the MENU button. To return to enter the Color menu. the display and press the key to enter the menu. 3. Press the or keys to select PICTURE and then press the ENTER key to have softness effect on . 24" LCD Color Monitor Picture menu BenQ...
... lightness. The function is not available for use when Dynamic Contrast is on Adjusts the degree of image. Press ENTER to the previous menu, press the MENU button. To return to enter the Color menu. the display and press the key to enter the menu. 3. Press the or keys to select PICTURE and then press the ENTER key to have softness effect on . 24" LCD Color Monitor Picture menu BenQ...
Service Manual
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.... Reset Color Resets the User Mode custom color settings to change the settings. Dynamic Contrast The function will become a magenta tint. Bluish Applies a cool tint to the image and is factory pre-set to the PC industry 0 to provide sharper and more of contrast to 63 standard white color. if you reduce use Press the or keys to make the color adjustments. • Blue (0 to leave the Color menu. The default start setting is the factory default color. 24" LCD Color Monitor BenQ E2400HD...
.... Reset Color Resets the User Mode custom color settings to change the settings. Dynamic Contrast The function will become a magenta tint. Bluish Applies a cool tint to the image and is factory pre-set to the PC industry 0 to provide sharper and more of contrast to 63 standard white color. if you reduce use Press the or keys to make the color adjustments. • Blue (0 to leave the Color menu. The default start setting is the factory default color. 24" LCD Color Monitor BenQ E2400HD...
Service Manual
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... to change the volume. Item Volume Function Adjusts the audio volume Operation Press the or keys to make adjustments or 5. Range Mute Audio Select Mutes the audio input Press the or keys to change the settings. selections. Allow users to select the audio source Press the or or let the monitor detect it automatically keys to change the settings. • ON • OFF • PC Audio • HDMI Audio • Auto Detect 26 24" LCD Color Monitor Audio menu BenQ E2400HD...
... to change the volume. Item Volume Function Adjusts the audio volume Operation Press the or keys to make adjustments or 5. Range Mute Audio Select Mutes the audio input Press the or keys to change the settings. selections. Allow users to select the audio source Press the or or let the monitor detect it automatically keys to change the settings. • ON • OFF • PC Audio • HDMI Audio • Auto Detect 26 24" LCD Color Monitor Audio menu BenQ E2400HD...
Service Manual
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... keys to enter the menu. 3. The language options displayed on your OSD may differ from those shown on the right, depending on the product supplied in your video cable connection type. Press the or keys to select SYSTEM and then press the ENTER key to adjust the value. Use this to enter the OSD Settings menu. Press ENTER to change the settings. 24" LCD Color Monitor System menu BenQ E2400HD 1. Input function.
... keys to enter the menu. 3. The language options displayed on your OSD may differ from those shown on the right, depending on the product supplied in your video cable connection type. Press the or keys to select SYSTEM and then press the ENTER key to adjust the value. Use this to enter the OSD Settings menu. Press ENTER to change the settings. 24" LCD Color Monitor System menu BenQ E2400HD 1. Input function.
Service Manual
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Position Display Time Adjusts the horizontal position of the OSD menu. Adjusts the display the OSD menu. Press MENU to enter the 'OSD Lock' option and make changes. Alternatively, you may use the or keys to change the settings. Position V. OSD Lock Prevents all OSD controls will be accessible. 24" LCD Color Monitor H. Press the ENTER key to select this function is preset to be set through Press the or keys to select 'OFF' in the 'OSD Lock' submenu from the 'OSD Settings' menu, and...
Position Display Time Adjusts the horizontal position of the OSD menu. Adjusts the display the OSD menu. Press MENU to enter the 'OSD Lock' option and make changes. Alternatively, you may use the or keys to change the settings. Position V. OSD Lock Prevents all OSD controls will be accessible. 24" LCD Color Monitor H. Press the ENTER key to select this function is preset to be set through Press the or keys to select 'OFF' in the 'OSD Lock' submenu from the 'OSD Settings' menu, and...
Service Manual
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... Factory OSD Menu Turn off the monitor, keep pressing the "MENU" + "ENTER" buttons, and turn on the PC. option. Press the ENTER key to select this function is activated, HDMI port will be selected by input select or by hot key. Press the or keys to change the settings. When this option. Press the the or keys to the factory default values. Resets all mode, color and geometry settings to change...
... Factory OSD Menu Turn off the monitor, keep pressing the "MENU" + "ENTER" buttons, and turn on the PC. option. Press the ENTER key to select this function is activated, HDMI port will be selected by input select or by hot key. Press the or keys to change the settings. When this option. Press the the or keys to the factory default values. Resets all mode, color and geometry settings to change...
Service Manual
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... hot plug pin detection.(HDMI port default) Mode 2: To disable the hot plug pin detection.(DVI port default) 8. add the auto power on item, the default is "on" 9. 24" LCD Color Monitor BenQ Service Page BenQ E2400HD 1. And need to 99999 hours 7. add BenQ logo on . 2. F/W version need to confirm it again and the default is same as normal OSD define. 6. Press the Menu key will close the service page. 4. Press menu key will display the service page 3. Panel type define need...
... hot plug pin detection.(HDMI port default) Mode 2: To disable the hot plug pin detection.(DVI port default) 8. add the auto power on item, the default is "on" 9. 24" LCD Color Monitor BenQ Service Page BenQ E2400HD 1. And need to 99999 hours 7. add BenQ logo on . 2. F/W version need to confirm it again and the default is same as normal OSD define. 6. Press the Menu key will close the service page. 4. Press menu key will display the service page 3. Panel type define need...
Service Manual
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24" LCD Color Monitor Key Board GND CN001 8 7 6 5 4 3 2 1 CONN GND LBADC1 LBADC2 DC_POWERON LED_GRN# LED_RED# C001 NC/0.001uF C002 NC/0.001uF C003 NC/0.001uF C004 NC/0.001uF GND C005 C006 NC/0.001uF NC/0.001uF R003 R002 R005 R004 R006 R007 1.8K1/10W 3K 1/10W 1% 3K 1/10W 1% 1.8K1/10W 1.8K1/10W 3K 1/10W 1% POWER CN002 LED_GRN# 1 LED_RED# 2 POWER 3 4 GND...
24" LCD Color Monitor Key Board GND CN001 8 7 6 5 4 3 2 1 CONN GND LBADC1 LBADC2 DC_POWERON LED_GRN# LED_RED# C001 NC/0.001uF C002 NC/0.001uF C003 NC/0.001uF C004 NC/0.001uF GND C005 C006 NC/0.001uF NC/0.001uF R003 R002 R005 R004 R006 R007 1.8K1/10W 3K 1/10W 1% 3K 1/10W 1% 1.8K1/10W 1.8K1/10W 3K 1/10W 1% POWER CN002 LED_GRN# 1 LED_RED# 2 POWER 3 4 GND...
Service Manual
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24" LCD Color Monitor Main Board (1) No Power BenQ E2400HD No power Press power key and look if the picture is normal NG Please reinsert and make sure the AC of 100-240V is normal NG OK Reinsert or check the power section Check if the Pin 3, 4 of CN701 are 5V input NG Check power board OK Measure U701 Pin2=3.3V, U702 Pin2=1.8V NG OK Replace U701, U702 Check if X401 oscillate waveforms are normal NG OK Replace X401 Check U401 47
24" LCD Color Monitor Main Board (1) No Power BenQ E2400HD No power Press power key and look if the picture is normal NG Please reinsert and make sure the AC of 100-240V is normal NG OK Reinsert or check the power section Check if the Pin 3, 4 of CN701 are 5V input NG Check power board OK Measure U701 Pin2=3.3V, U702 Pin2=1.8V NG OK Replace U701, U702 Check if X401 oscillate waveforms are normal NG OK Replace X401 Check U401 47
Service Manual
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24" LCD Color Monitor W / LED, No Backlight Check Inverter input =12V NG OK Check ON/OFF signal NG OK Check U801 PIN 11=5V NG OK BenQ E2400HD Check adapter and F801 Check Interface board or main board Change ON/OFF circuit Check U801 PIN8/PIN9 PWM wave NG OK Check U801 Check Q805, Q806 Drain wave NG OK Change Q805, Q806 Check the output of T801 NG OK Check connecter & lamp, feedback and protect circuit Change T801 51
24" LCD Color Monitor W / LED, No Backlight Check Inverter input =12V NG OK Check ON/OFF signal NG OK Check U801 PIN 11=5V NG OK BenQ E2400HD Check adapter and F801 Check Interface board or main board Change ON/OFF circuit Check U801 PIN8/PIN9 PWM wave NG OK Check U801 Check Q805, Q806 Drain wave NG OK Change Q805, Q806 Check the output of T801 NG OK Check connecter & lamp, feedback and protect circuit Change T801 51