BenQ G920HDA Service Manual Download Page 50

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18.5” LCD Color Monitor BenQ G920HDA

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

Check IC801

Check Q805, Q806 Drain wave

Check the output of T801

Change Q805, Q808

Check connecter & lamp, feedback and protect circuit

Change T801

Summary of Contents for G920HDA

Page 1: ...st Date 01 13 2009 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...

Page 2: ...tion 6 4 Related service information 7 5 Product Overview 8 5 1 Monitor Specifications 8 5 2 Packing 9 Level 1 Cosmetic Appearance Alignment Service 12 Visual Inspection Cleaning 12 Software Firmware...

Page 3: ...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 Telete...

Page 4: ...G and B all colours Y C are ROM Read Only Memory S SDA Data signal on I 2 C bus SDRAM Synchronous DRAM SW Sub Woofer Software T THD Total Harmonic Distortion V VGA Video Graphics Array Y YPbPr Compon...

Page 5: ...ice 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 1...

Page 6: ...containing electrical components are sensitive to electrostatic discharge ESD Follow ESD safety procedures while handling these parts 8 Some products contain more than one battery Do not disassemble...

Page 7: ...our LCD monitor This specification defines the requirements for the 18 5 MICROPROCESSOR based Multi mode supported high resolution color LCD monitor This monitor can be directly connected to general 1...

Page 8: ...ynchronization TTL separate signal connection 15 pin mini D sub cable H Frequency 30 63 kHz Multi frequency monitor V Frequency 50 76 Hz modes within these parameters Display Colors 16 7M Colors Image...

Page 9: ...CD Color Monitor BenQ G920HDA 9 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 EPE bag to pack th...

Page 10: ...18 5 LCD Color Monitor BenQ G920HDA 10 Using the EPS to pack the monitor Putting the base and user manual in the position as the picture shows above...

Page 11: ...18 5 LCD Color Monitor BenQ G920HDA 11 Putting the monitor and accessories into the carton Power cord User manual...

Page 12: ...aced near or over a radiator or heat source or in a built in installation unless proper ventilation is provided Never push objects or spill liquid of any kind into this product Software Firmware Upgra...

Page 13: ...18 5 LCD Color Monitor BenQ G920HDA 13 4 The process of ISP write is as follows a Double click running the program as follows Connect to the PC LPT Connect to the BenQ model...

Page 14: ...llows c Click icon search the program BenQ_G920HDA_RTD2525LH_AUO185_DCR_V100 H00 and click open d Click icon search the program BenQ_G920HDA_RTD2525LH_AUO185_DCR_V100 H01 and click open e Click icon s...

Page 15: ...18 5 LCD Color Monitor BenQ G920HDA 15 f Click icon until appear the follow Fig writer completed...

Page 16: ...he OSD On Screen Display menu to adjust all the settings on your monitor Press the MENU key to display the following main OSD menu There are four main OSD menus 1 Display 2 Picture 3 Picture Advanced...

Page 17: ...n Item Function Operation Range Auto Adjustment Optimizes and adjusts the screen settings automatically for you The AUTO key is a hot key for this function When you connect a digital video output usin...

Page 18: ...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 4 Press t...

Page 19: ...int to the image and is factory pre set to the PC industry standard white color 0 to 63 Reddish Applies a warm tint to the image and is factory pre set to the news print standard white color User Mode...

Page 20: ...ress the ENTER key to select this option Press the or keys to change the settings 0 to 5 Picture Advanced menu 1 Press the MENU key to display the main menu 2 Press the or keys to select PICTURE ADVAN...

Page 21: ...9 to be displayed without geometric distortion Full Scales the input image to fill the screen Ideal for 16 9 aspect images Aspect The input image is displayed without geometric distortion filling as...

Page 22: ...or selections 5 To return to the previous menu press the MENU button Item Function Operation Range Input Selects the D sub analog input Use this to change the input to that appropriate to your video...

Page 23: ...ettings 0 to 100 V Position Adjusts the vertical position of the OSD menu 0 to 100 Display Time Adjusts the display the OSD menu 5 Sec 10 Sec 15 Sec 20 Sec 25 Sec 30 Sec OSD Lock Prevents all the moni...

Page 24: ...he or keys to change the settings ON OFF Information Displays the current monitor property settings Press the ENTER key to select this option HDMI Auto Switch When this function is activated HDMI port...

Page 25: ...X 1280 x 768 47 396 60 68 25 CVT 1280x800 49 702 59 81 83 5 CVT 8 X 1280x800 62 8 75 106 5 X 1280x720 45 59 94 74 25 1280x720 44 77 59 86 74 5 1280x720 56 46 74 78 95 75 1280 x 960 60 60 108 VESA X 12...

Page 26: ...e 4 power off will quit the service mode 5 At the service mode the key function is same as normal OSD define 6 The timer can only reset at the service mode by Timer Reset And need to have a warning me...

Page 27: ...18 5 LCD Color Monitor BenQ G920HDA 27...

Page 28: ...1 PCS LOGO_COVER 7 Q34G0545ADP 1B0130 1 PCS STAND_FRONT 8 Q37G0125011 1 PCS HINGE 9 Q34G0546ADP 1B0100 1 PCS STAND_BACK 10 A33G0251ADP 1L0100 1 PCS CLIP 11 Q34G0547ADP 1B0133 1 PCS BASE 12 Q12G6082 1...

Page 29: ...18 5 LCD Color Monitor BenQ G920HDA 29 22 CBPCRRPBFQA 1 PCS MAIN BOARD 23 KEPC8QH6 1 PCS KEY BOARD 24 PWPC8521VYD5 1 PCS POWE RBOARD Six angles view...

Page 30: ...0 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 uninstall And then remove the four screws as below...

Page 31: ...n the gap with your fingers along the sides of bezel 2 Work in the gap with your fingers along the top side 3 Flip the monitor over and make the panel screen face downwards Note Dismantle sequence as...

Page 32: ...18 5 LCD Color Monitor BenQ G920HDA 32 3 Remove the Bezel Remove the bezel as follow Fig 3...

Page 33: ...18 5 LCD Color Monitor BenQ G920HDA 33 4 Remove the Panel Remove the 4 screws on the side of main frame first and then disconnect the Lamp Connections and LVDS Cable connection...

Page 34: ...lor Monitor BenQ G920HDA 34 5 Remove the Main Board and Power Board Remove the screws in red and disconnect the all connections at last you can get the Main Board and Power Board as follow POWER BOARD...

Page 35: ...Color Monitor BenQ G920HDA 35 Block Diagram Main Board D Sub Connector CN301 H sync V sync RGB Panel Interface CN603 Key Control Interface CN202 Crystal 14 318MHz X401 Scalar RTD2035L U501 MCU RTD2122...

Page 36: ...Bridge Rectifier and Filter Start Circuit R904 R932 PWM Control IC Transformer Over Voltage Protect Rectifier Diodes AC input 5V 12V ON OFF Control PWM Control IC Feedback Circuit Output Circuit DC C...

Page 37: ...0 75R 1 16W R301 100R 1 16W C303 22pF 1 2 ZD305 RLZ5 6B R303 100R 1 16W 3 1 2 D301 BAV99 R305 2 2K 1 16W C302 22pF R304 2 2K 1 16W 1 2 ZD304 RLZ5 6B R314 75R 1 16W R312 100R 1 16W DSUB_5V 3 1 2 D303 B...

Page 38: ...PD8FWBUNN 1 0 BenQ G920HDA B 4 7 Friday Nov ember 28 2008 715G2498 1E AO 4 POWER G2498 1E AO X 9 081110 C203 100UF25V VCC3 BKLT EN VCC3 C202 100UF25V C204 0 1uF 16V DIM 4 POWER_KEY 4 Q205 PMBS3906 CMV...

Page 39: ...R424 1K 1 16W 2007 1 15 change R413 R414 from 4 7K to 2 2K CMVCC MCU_VCC PPWR_ON R432 100R 1 16W LED_G 2 R451 4K7 1 16W R409 NC C409 NC 22pF 16V MCU_VCC IICSCL RTD_SCLK R430 100R 1 16W R414 4K7 1 16W...

Page 40: ...V4 RX0P V5 RX0N V6 RXCP V7 RXCN AVS AHS ADC_GND B B G G R R ADC_VDD BJT_B VCCK PGND TXE3 TXE3 TXE2 TXE2 TXO1 TXO1 TXO2 TXO2 TXOC TXOC TXO3 TXO3 TXE0 TXE0 TXE1 TXE1 V0 RX2N VCLK RX2P TMDS_VDD XIN DDCS...

Page 41: ...LVDS_E9 LVDS Panel Normal Type RXE1 RXEC RXEC RXE2 R604 47K 1 16W 2006 11 7 Add pull up 4K7 to MVCC C603 0 1uF 16V 3 RXE0 RXE2 LVDS_E6 LVDS_E2 FB601 120 S RXE3 RXE0 RXE3 PANEL_VCC RXE1 2 PANEL_VCC RX...

Page 42: ...D923 NC 1 2 R927 3 6K OHM 1 1 10W C928 0 01uF N C C910 NC R921 NC CN901 87G 501 32 DL SOCKET 1 2 3 5V GND1 GND 1 2 C917 680uF 25V R919 100 OHM 1 4W F904 NC Q904 NC R910 10R 1 4W T901 POWER X FMR 7 8 9...

Page 43: ...DIM C824 0 1uF R810 51K OHM 1 1 8W C823 0 0022uF Q805 PDTC144WK R856 15R 1 4W R818 1K 1 10W 1 C817 NC ON OFF C845 2 2uF 16V R862 1M 1 10W 5 R807 10K 1 10W 1 12V D811 NC R863 10K 1 10W 1 R827 1K 1 10W...

Page 44: ...F R003 1K 1 10W 1 C002 NC 0 001uF SW004 SW004 2 1 3 4 5 LED_GRN ZD001 NC POWER CN001 Wire Harness 1 2 3 4 5 6 GND GND C004 NC 0 001uF R005 3K 1 10W C G920HD A 2 2 Wednesday December 03 2008 715G3367 C...

Page 45: ...nQ G920HDA 45 Troubleshooting Guide Equipments and Tools Requirement 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with and Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Serv...

Page 46: ...icture is normal Please reinsert and make sure the AC of 100 240 is normal Reinsert or check the power section Check if X401 oscillate waveforms are normal Measure U201 Pin2 3 3V OK OK NG NG NG Replac...

Page 47: ...rmal Replace X401 Check if the sync signal from computer is output and video cable is connected normally Input the sync signal of computer or change the cable NG OK NG Check U401 Replace U401 Measure...

Page 48: ...Q601 base is low level X401 oscillate waveform is normal Check Correspondent component Replace Panel Check Correspondent component OK OK Replace X401 NG NG NG NG Check reset circuit of U401 is normal...

Page 49: ...C907 Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901 Check R904 R905 Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller than 20V 1 Ch...

Page 50: ...801 Check ON OFF signal Check Interface board or main board NG OK Check IC801 PIN 11 5V NG OK Change ON OFF circuit Check IC801 PIN8 PIN9 PWM wave NG OK Check IC801 Check Q805 Q806 Drain wave NG Check...

Page 51: ...DA 51 Keypad Board OSD is unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch Y N N Is Key Pad Board normally Replace Key...

Page 52: ...18 5 LCD Color Monitor BenQ G920HDA 52 PCB LAYOUT Main Board...

Page 53: ...18 5 LCD Color Monitor BenQ G920HDA 53 Power Board...

Page 54: ...0M1G 130 6120 M3 6 FOR MAIN FRAME PANEL 4 3 0 5KGF CM 0M1G1730 6120 M3 6 FOR ALL BOARDS MAIN FRAME 4 6 1 KGF CM AM1G1740 12 47 CR3 M4 12 HINGE STAND MF 2 0M1G1730 8120 M3 8 FOR HEAT SINK 1 0M1G1730 81...

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