BenQ G900WA Service Manual Download Page 38 | Manualshive

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19” LCD Color Monitor BenQ G900WA

38

(3) White screen

White Screen

Measure Q602 base
is low level?

X401 oscillate
waveform is normal

Check Correspondent
component.

Replace Panel

Check Correspondent
component.

Replace U501

OK

OK

Replace X401

OK

NG

NG

NG

NG

Check reset circuit of
U501 is normal

OK

Check Q602, Q601 is broken

or CN601 solder?

Check U401

OK

Replace U401

NG

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Summary of Contents for G900WA

Page 1: ... 3 Factory Preset Display Modes 7 3 4 Panel Specification 8 4 Disassembly Assembly 13 4 1 Three angles view 13 4 2 Exploded View 14 4 3 Disassembly 15 5 Cosmetic Appearance Alignment Service 19 5 1 Software Firmware Upgrade Process 19 5 2 Adjustment Alignment Procedure 22 5 3 White Balance Luminance Adjustment 31 6 Circuit Board and Standard Parts Replacement 33 6 1 Electrical Block Diagram 33 6 2...

Page 2: ...rvice Manual Please do pay attention to the item part of THE DISASSEMBLY when repair the machine and also do the protection of Panel any time When repairing the circuit board please follow the requirement of RoHS and refer to the circuit diagram and repairing process that attached in the Service Manual The method of firmware updated the way of using the menu and some information that may be used w...

Page 3: ...th the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following ...

Page 4: ...tial resolution 2 4 Related service information Do not use the monitor near water e g near a bathtub washbowl kitchen sink laundry tub swimming pool or in a wet basement Do not place the monitor on an unstable cart stand or table If the monitor falls it can injure a person and cause serious damage to the appliance Use only a cart or stand recommended by the manufacturer or sold with the monitor If...

Page 5: ...tances is restricted use only designated spare parts when it is necessary to replace such parts with new parts Use lead free solder for the equipment compatible with ones with substrates on which lead free components are mounted For the details refer to Caution for Lead Free Soldering Work given in the next page It is important to note that this manual contains various CAUTIONS and NOTICES which s...

Page 6: ...76 Hz modes within these parameters Display Colors 16 7M Colors Max Resolution 1440 x 900 Plug Play VESA DDC2BTM ON Mode 40W EPA ENERGY STAR saving mode 1 Watt 120 V 2 Watt 240 V Input Connector 15 pin D Sub Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Power Source 100 240VAC 50 60Hz Environmental Considerations Operating Temp 0 to 40 C Operating Humidity 10 to 90 Dimension 441 3 x 3...

Page 7: ...nnector Pin No Description Pin No Description 1 Red 9 5V 2 Green 10 Detect Cable 3 Blue 11 Ground 4 Ground 12 DDC Serial Data 5 VGA_CON 13 H Sync 6 R Ground 14 V Sync 7 G Ground 15 DDC Serial Clock 8 B Ground 1 5 6 10 11 15 3 3 Factory Preset Display Modes ...

Page 8: ...19 wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch LVDS interface This module supports 1440 x 900 WXGA mode and can display 16 7M colors The inverter module for Backlight is not built in General Specifications Mechanical Specifications Electrical Characteristics ...

Page 9: ...19 LCD Color Monitor BenQ G900WA 9 Optical Characteristics ...

Page 10: ... display LCD that uses amorphous silicon TFT Thin Film Transistor as switching components This model is composed of a TFT LCD panel a driver circuit and a back light unit The resolution of a 19 0 is 1440 x 900 and this model can display up to 16 7 millions colors General Specifications Mechanical Specifications ...

Page 11: ...19 LCD Color Monitor BenQ G900WA 11 Electrical Characteristics ...

Page 12: ...19 LCD Color Monitor BenQ G900WA 12 Optical Characteristics ...

Page 13: ...19 LCD Color Monitor BenQ G900WA 13 4 Disassembly Assembly 4 1 Three angles view ...

Page 14: ...19 LCD Color Monitor BenQ G900WA 14 4 2 Exploded View ...

Page 15: ...onitor G900WA dose not have DVI Connector 1 Back View as Fig1 Place the monitor face down on a smooth surface as Fig 1 Be careful to avoid scratch and injury during the uninstall Fig1 2 Remove the STAND BASE ASS Y Remove the two screws in red to remove the STAND BASE ASS Y as Fig2 Fig2 3 Remove the Rear Cover and Bezel ...

Page 16: ...put attention to when remove the rear cover Use plastic putty knife to release the 6 hooks on the bottom 6 hooks on the top 5 hooks on the left 5 hooks on the right and remove the only one screw in red as Fig3 on the rear cover then you can easily remove the rear cover and bezel Fig3 ...

Page 17: ...LCD Color Monitor BenQ G900WA 17 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 SCREWS LVDS CABLE Lamp Connection ...

Page 18: ...19 LCD Color Monitor BenQ G900WA 18 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 ...

Page 19: ... BenQ G900WA 19 5 Cosmetic Appearance Alignment Service 5 1 Software Firmware Upgrade Process Note here we will take a AOC monitor for example 1 Connect the ISP board as follow 2 Double click running the program as follows ...

Page 20: ...Color Monitor BenQ G900WA 20 3 Click the icon when the screen as shown below appears please click the icon to load the software program If there are two programs please select the option of Both or select Main ...

Page 21: ...19 LCD Color Monitor BenQ G900WA 21 4 Until appears the follow Fig writer completed ...

Page 22: ...SD 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 4 System Use the left or right keys to highlight a menu item and press the ENTER key to enter the Menu item settings ...

Page 23: ...djustment Optimizes and adjusts the screen settings automatically for you The AUTO key is a hot key for this function Press the ENTER key to select this option and make adjustment H Position Adjusts the horizontal position of the screen image 0 to 100 V Position Adjusts the vertical position of the screen image 0 to 100 Pixel Clock Adjusts the pixel clock frequency timing to synchronize with the a...

Page 24: ...e Brightness Adjusts the balance between light and dark shades The function is not available for use when Dynamic Contrast is on Press the key to increase the brightness and press the key to decrease the brightness 0 to 100 Contrast Adjusts the degree of difference between darkness and lightness The function is not available for use when Dynamic Contrast is on Press the key to increase the contras...

Page 25: ...e colors will reduce their respective influence on the color tint of the image e g if you reduce the Blue level the image will gradually take on a yellowish tint If you reduce Green the image will become a magenta tint Press the left or right keys and the ENTER key to select Red Green or Blue Then use Press the left or right keys to make the color adjustments Red 0 to 100 Green 0 to 100 Blue 0 to ...

Page 26: ...r right keys to select PICTURE ADVANCED and then press the ENTER key to enter the menu 3 Press the left or right keys to move the highlight to a menu item and then press the ENTER key to select that item 4 Press the left or right keys to make adjustments or selections 5 To return to the previous menu press the MENU button ...

Page 27: ...ay Mode This feature is provided to allow aspect ratio s other than 16 10 to be displayed without geometric distortion Full Scales the input image to fill the screen Ideal for 16 10 aspect images Aspect The input image is displayed without geometric distortion filling as much of the display as possible 16 9 images will fill the screen horizontally while 4 3 images will fill the screen vertically 1...

Page 28: ...tion Operation Range Input Selects the D sub analog or DVI digital input Use this to change the input to that appropriate to your video cable connection type Analog only models do not have the Input function Press the left or right keys to change the settings DVI D sub OSD Settings Press ENTER to enter the OSD Settings menu Language Sets the OSD menu Language Press the left or right keys to adjust...

Page 29: ...10 Sec 15 Sec 20 Sec 25 Sec 30 Sec OSD Lock Prevents all the monitor settings from being accidentally changed When this function is activated the OSD controls and hotkey operations will be disabled Press the left or right keys to change the settings To unlock the OSD controls when the OSD is preset to be locked press and hold the MENU key for 15 seconds to enter the OSD Lock option and make change...

Page 30: ... on the PC Press the ENTER key to select this option Press the the left or right keys to change the settings ON OFF Information Displays the current monitor property settings Press the ENTER key to select this option Reset All Resets all mode color and geometry settings to the factory default values Press the left or right keys to change the settings YES NO ...

Page 31: ...color sRGB color temp parameter is x 313 30 y 329 30 Y 200 20cd m2 3 Into Factory mode of BENQ G900WA Turn off the monitor keep pressing the ENTER button and turn on the monitor then when we press the AUTO button the factory OSD will be at the left top of the panel 4 Bias adjustment Set the Contrast to 50 Adjust the Brightness to 100 5 Gain adjustment Move cursor to F and press MENU key A Adjust R...

Page 32: ...until chroma 7120 indicator reached the value G 100 6 Adjust the BLUE of color1 on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet the tolerance 100 2 D Adjust sRGB color temperature 1 Switch the chroma 7120 to RGB Mode with press MODE button 2 Switch the MEM channel to Channel 10 with up or down arrow on chrom...

Page 33: ...Standard Parts Replacement 6 1 Electrical Block Diagram Main Board MCU RTD 2120L U401 Scalar IC RTD2025L Include ADC OSD U501 EEPROM M24C16 U403 D Sub Connector CN301 H sync V sync RGB EPR_SDA EPR_SCL LCD Interface CN601 Key Board Control CN202 Crystal X401 ...

Page 34: ...C IC TEA1530 Transformer T901 Over Voltage Protect 5V Rectifier and Filter ON OFF Control Q805 Q808 PWM Control IC TL494 Feedback Circuit Output Circuit Transformer MOSFET Q802 Q803 Lamp ON OFF DIM Control Feedback Circuit 14V Start Circuit R904 R932 R933 Over Voltage Protect 5V 14V Rectifier and Filter CN902 ...

Page 35: ...Q G900WA 35 6 2 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 Service Manual 8 User Manual ...

Page 36: ...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 X401 oscillate waveforms are normal Measure U201 Pin2 3 3V OK OK NG NG NG Replace U201 Check U401 Replace X401 OK NG Replace U501 Replace U401 OK NG ...

Page 37: ...Measure U201 PIN2 3 3V Replace U201 X401 oscillate waveforms are normal 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 Replace U501 NG OK OK NG Check U401 Replace U401 ...

Page 38: ...e is low level X401 oscillate waveform is normal Check Correspondent component Replace Panel Check Correspondent component Replace U501 OK OK Replace X401 OK NG NG NG NG Check reset circuit of U501 is normal OK Check Q602 Q601 is broken or CN601 solder Check U401 OK Replace U401 NG ...

Page 39: ...uit Check CN902 pin4 5 14V Check the voltage of C905 Check start voltage for the pin8 of IC901 Check R904 R932 R933 and Change IC901 NG Check the auxiliary voltage is bigger than 10V and smaller than 20V NG NG NG Check Q902 D906 IC903 ZD921 ZD922 Check IC901 pin6 PWM wave 1 Check IC901 Check NG OK NG OK OK OK OK Check AC line volt 110V or 220V Check AC input ...

Page 40: ...l and the pin 12 of IC801 is 14V Check main board or change ON OFF signal Check the pin5 of IC801 have saw tooth wave Change IC801 Check Q802 Q803 PIN5 6 7 8 have the output of square wave at short time Check the output of T801 T802 Change T801 T802 Check connecter lamp OK OK OK NG OK NG NG NG OK NG OK Check the PWM wave from the pin9 10 of IC801 check IC801 ...

Page 41: ...A 41 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 Pad Board Y N Y Check Main Board ...

Page 42: ...19 LCD Color Monitor BenQ G900WA 42 6 3 Circuit operation theory 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18 ...

Page 43: ...the LED and set it to green color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out an interrupt request 14 Wake up the scalar 15 Are there any signals coming from analog port 16 Display No connection Check Signal Cable message And go into standby mode after the message disappears 17 Program ...

Page 44: ...M1G1730 6120 SCREW 705GQ734328 19 LCD BEZEL ASS Y A33G0248ADC 1L0100 KEY PAD 1 A33G0248ADC 2L0100 KEY PAD 2 A33G0249ADCA1C0100 POWER BUTTON A33G0250ADQ 1C0100 LENS A34G0450ADDA1B0130 BEZEL L19W 7BENQ 705GQ734329 19 LCD REAR COVER ASS Y A33G0258ADPB1L0100 LOGO COVER A34G0451ADP 2B0130 REAR COVER L19W 7BENQ 705GQ734330 19 LCD STAND BASE ASS Y 0M1G1740 10120 SCREW 0Q1G1740 10120 SCREW A33G0247ADP 1L0...

Page 45: ...113356A 24LC16B SNG SOIC 8PIN Q401 057G 417 4 PMBS3904 PHILIPS SMT 04 Q202 057G 417 4 PMBS3904 PHILIPS SMT 04 Q204 057G 417 6 PMBS3906 PHILIPS SMT 06 Q205 057G 417 6 PMBS3906 PHILIPS SMT 06 Q602 057G 417 6 PMBS3906 PHILIPS SMT 06 Q501 057G 417 22 T TRA KN2907AS 60V 0 6A SOT 23 Q502 057G 417 22 T TRA KN2907AS 60V 0 6A SOT 23 Q601 057G 763 1 A03401 SOT23 BY AOS A1 R429 061G0402000 RST CHIPR 0 OHM 5 ...

Page 46: ... 1 16W R201 061G0402201 RST CHIP 200R 1 16W 5 R426 061G0402220 RST CHIPR 22 OHM 5 1 16W R428 061G0402220 RST CHIPR 22 OHM 5 1 16W R305 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R304 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R306 061G0402361 RST CHIP 360R 1 16W 5 R309 061G0402361 RST CHIP 360R 1 16W 5 R308 061G0402361 RST CHIP 360R 1 16W 5 R315 061G0402361 RST CHIP 360R 1 16W 5 R313 061G0402361 RST CHIP ...

Page 47: ...02104 15 MLCC 0402 0 1UF K 16V X5R C315 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C403 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C406 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C410 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C501 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C503 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C506 065G0402104 15 MLCC 0402 0 1UF K 16V X5R C507 065G0402104 15 MLCC 0402 0 1UF K 16V X...

Page 48: ...AIN BOARD PCB KEPC7QB4 KEY BOARD SW004 077G 602 1 CJ TACT SWITCH SW005 077G 602 1 CJ TACT SWITCH SW006 077G 602 1 CJ TACT SWITCH SW001 077G 602 1 CJ TACT SWITCH SW002 077G 602 1 CJ TACT SWITCH SW003 077G 603 3 FD TACT SWITCH SFKQLA2520 LED001 081G 10 12 KB LED 5MM SPUER BRIGHT YELLOW GREEN GND1 095G 900690 D WIRE HARNESS 100MM CN001 095G8014 6D660 HARNESS 6P 6P 160MM R006 061G0603180 1F RST CHIPR ...

Page 49: ... 20 400VAC C905 067G 40J10115K EC CAP 100UF 450V 18 35MM C803 067G215D4714KV E C 105 CAP 470UF M 25V ED SERIES C802 067G215D4714KV E C 105 CAP 470UF M 25V ED SERIES C918 067G215D6814KV CAP 105 680UF M 25V C917 067G215D6814KV CAP 105 680UF M 25V C939 067G215S1024KV EC 105 CAP 1000UF M 25V C915 067G215S4713KV EC 105 CAP 470UF M 16V L902 073G 174 65 H LINE FILTER L901 073G 174 76 H FILTER L903 073G 2...

Page 50: ...0603000 RST CHIPR 0 OHM 5 1 10W R801 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R809 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R812 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R814 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R815 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R816 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R818 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R821 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R822 061...

Page 51: ... R820 061G0603470 2F RST CHIPR 47 KOHM 1 1 10W R854 061G0603680 2F RST CHIPR 68 KOHM 1 1 10W R853 061G0603680 2F RST CHIPR 68 KOHM 1 1 10W R841 061G0603680 2F RST CHIPR 68 KOHM 1 1 10W R806 061G0603680 2F RST CHIPR 68 KOHM 1 1 10W R839 061G0805000 0 OHM 1 10W R850 061G0805000 0 OHM 1 10W R804 061G0805101 RST CHIPR 100 OHM 5 1 8W R929 061G0805102 RST CHIPR 1KOHM 5 1 8W R917 061G0805102 RST CHIPR 1K...

Page 52: ...061G1206102 RST CHIPR 1 KOHM 5 1 4W R928 061G1206102 RST CHIPR 1 KOHM 5 1 4W R855 061G1206330 RST CHIPR 33 OHM 5 1 4W R857 061G1206330 RST CHIPR 33 OHM 5 1 4W R904 061G1206472 RST CHIPR 4 7 KOHM 5 1 4W R932 061G1206472 RST CHIPR 4 7 KOHM 5 1 4W R933 061G1206472 RST CHIPR 4 7 KOHM 5 1 4W R901 061G1206684 RST CHIPR 680 KOHM 5 1 4W R902 061G1206684 RST CHIPR 680 KOHM 5 1 4W R903 061G1206684 RST CHIPR...

Page 53: ...065G1206102 72 CHIP 1000PF 500V X7R D808 093G 64 38 D DIODE BAW56 DIODES D805 093G 64 38 D DIODE BAW56 DIODES D806 093G 64 44 S LL4148WP D809 093G 64 44 S LL4148WP D814 093G 64 44 S LL4148WP D817 093G 64 44 S LL4148WP D903 093G 64 44 S LL4148WP D915 093G 64 44 S LL4148WP D916 093G 64 44 S LL4148WP D801 093G 6433P BAV99 D802 093G 6433P BAV99 D803 093G 6433P BAV99 D804 093G 6433P BAV99 ZD902 093G 39...

Page 54: ...6000 121A EMPTY CARTON Q44G6002CP130A PAPER CAP Q44G6002CP172A PAPER CAP Q44G9080 1 EPS Q44G9080 2 EPS Q44G9080881 1A 19W BENQ CARTON Q45G 88606 R PE BAG FOR BASE Q45G 88609 87 EPE COVER FOR MONITOR Q50G 600 B 1 BENQ STRAP Q52G 1185 79 MIDDLE TAPE FOR BENQ CARTON Q52G 1185 87 BENQ TAPE FOR PALLET 040G 58162435A LABEL Q41G7800881 4A SERVICE INFORMATION 4J L2R05 001 Q41G7800881 6A QSG 4J 0C401 001 Q...

Page 55: ...0 BEZEL L19W 7BENQ 705GQ734332 19 LCD REAR COVER ASS Y A34G0451ADP 4B0130 REAR COVER L19W 7BENQ E750L 750GLS90M3152N PANEL LTM190M2 L31 8TC 0TS SZ SEC A15G0205 BS 2 MAINFRAME CBPC7SRDBQQ MAIN BOARD U401 056G1125701 X WBQRWR9SRQ1 IC MCU RTD2120L LF REALTEK R313 061G0402101 RST CHIPR 100 OHM 5 1 16W R309 061G0402101 RST CHIPR 100 OHM 5 1 16W R306 061G0402101 RST CHIPR 100 OHM 5 1 16W R315 061G040210...

Page 56: ...N4148W 715G2538 3 POWER BOARD PCB Q40G 19N881 2B RATING LABEL Q40G0002881 3A LABEL FOR CARTON Q44G9080BRO 1 PAPER BLOCK Q45G 88609126 EPE BAG Q41G7800881 5A SAFETY_INSTRUCTIONS 4J L2V03 001 Q70G9002881 1B CD MANUAL Diversity of T97SRDDMTWBGNN compared with T97MRDDBTWBQNN Location TPV Part No Description 050G 600 1 W WHITE STRAP 052G 1209 A 200MINIUM TAPE E089B 089G 728CAA 2G SIGNAL CABLE E089C 089...

Page 57: ...0W R814 061G0603150 1F RST CHIPR 1 5 KOHM 1 1 10W R815 061G0603150 1F RST CHIPR 1 5 KOHM 1 1 10W R816 061G0603150 1F RST CHIPR 1 5 KOHM 1 1 10W R802 061G0603180 2F RST CHIPR 18 KOHM 1 1 10W R851 061G0603180 2F RST CHIPR 18 KOHM 1 1 10W R856 061G1206330 RST CHIPR 33 OHM 5 1 4W R858 061G1206330 RST CHIPR 33 OHM 5 1 4W C841 065G0805102 31 1000PF 50V NPO C838 065G0805102 31 1000PF 50V NPO D903 093G 64...

Page 58: ...19 LCD Color Monitor BenQ G900WA 58 Q41G780088117A 4J 06K02 003 WARRANTY CARD FOR CHINA Q70G9002881 3A CD MANUAL 5B 0C401 003 DCR ...

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