ViewSonic G90fB-4 User Manual Download

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Service Manual

ViewSonic G90fB-4

Model No. VS10794

19” Digital Controlled Color Monitor

(G90fB-4_SM Rev. 1a Jan. 2006)

ViewSonic

381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Summary of Contents for G90fB-4

Page 1: ...Service Manual ViewSonic G90fB 4 Model No VS10794 19 Digital Controlled Color Monitor G90fB 4_SM Rev 1a Jan 2006 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583...

Page 2: ...Description 6 4 Circuit Description 10 5 Adjusting Procedure 13 6 Trouble Shooting Flow Chart 17 7 Recommended Spare Parts List 22 8 Exploded Diagram And Spare Parts List 37 9 Block Diagram 39 10 Sch...

Page 3: ...and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to make changes from time to time i...

Page 4: ...cing pay attention to original lead dress especially in the high voltage circuit If a short circuit is found replace all parts which have been overheated as a result of the short circuit 3 3 All the p...

Page 5: ...WARNING The only potential source of X Radiation is the picture tube However when the high voltage circuit is operating properly there is no possibility of X Radiation problem The basic precaution wh...

Page 6: ...ets VESA 800 x 600 75Hz 85Hz MAC 1024 x 768 75Hz VESA 1024 x 768 75Hz 85Hz MAC 1152 x 870 75Hz VESA 1280 x 1024 75Hz Other Factory Presets IND 640 x 400 70Hz VGA 640 x 480 60Hz VESA 640 x 480 85Hz 6 D...

Page 7: ...70 mm 16 External Connection 15 Pin D sub Connector AC Power Cord 17 Power Consumption Modes ON Mode 75Watts Sleep 4Watts Off 2W Power switch off 18 Regulatiory Safety North America Regulatory Filing...

Page 8: ...firm grounding The connector information is as follow 15 Pin Color Display Signal Cable PIN NO DESCRIPTION PIN NO DESCRIPTION 1 RED V 9 5V From PC 2 GREEN V 10 Sync GND 3 BLUE V 11 NC 4 NC 12 SDA 5 G...

Page 9: ...creen Image Use the buttons on the front control panel to display and adjust the OSD controls The OSD controls are explained at the top of the next page and are defined in Main Menu Controls on page 8...

Page 10: ...unlocked Do the following to adjust the screen image 1 To display the Main Menu press button 1 2 To select a control you want to adjust press the arrow buttons on the front control panel of your monit...

Page 11: ...he screen image Vertical Position moves the screen image up or down Pincushion curves the vertical sides of the screen image Pin Balance curves the vertical edges of the screen image to the left or ri...

Page 12: ...dds red to the screen image for warmer white and richer red 5000K Adds blue and green to the screen image for a darker color User Color Individual adjustments for red green and blue Moire reduces inte...

Page 13: ...control facilities Further the IC generates the drive waveforms for DC coupled vertical boosters to the TDA8172 H V sync signals processor The functions of the sync processor include polarity detectio...

Page 14: ...External capacitors on XTAL1 and XTAL2 are not allowed B Control Function Block The B control block of the SAA4849 has the same behaviour as the TDA4856 with adapted threshol voltages The circuit allo...

Page 15: ...Output Voltage IC901 Power IC for Switching Power Control Q937 Q937 Use for Power Saving Q912 Q920 Push Pull Topology to Drive Q911 Q913 Degaussing Switcher Transistor IC903 5V Regulator IC Q403 HOR...

Page 16: ...tment method 1 14V B HV voltage adjustment A Chroma 2000 Signal generator or PC equivalent set mode 1 VGA 640X480 pattern 1 0 B Connect a DC Volt meter between TP901 and ground then adjust VR903to be...

Page 17: ...AM 50 COLOR TEMPERATURE ROTATION OSD EXIT HT HC RASTER VG MAX V SIZE GAIN RANGE HG H SIZE GAIN H MOIRE REDUCE HS SUB H SIZE V MOIRE REDUCE TOP CORNER HL H Linearity Modify BOTTOM CORNER VF V FOCUS ADJ...

Page 18: ...s the menu Key to enter second menu press the down key to select zoom about 10S then enter into factory setting area for modulation B Set R G B gain DAC value for 50 R G B bias DAC value for 60 C Rast...

Page 19: ...ctive color purity Make minor adjustments if needed RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets Deflection Yoke 4 pole Convergence Magnets 6 pole Convergence Magnets 6 Convergence adjustme...

Page 20: ...HECK HIGH VOLTAGE OF CRT ABOUT 25 5 26 5KV PLEASE CHECK POWER SAVING CIRCUIT OR POWER SUPPLY CIRCUIT ENTER POWER OR POWER CIRCUIT FAIL CHECK THE HEATER VOLTAGE AT CRT SOCKET ABOUT 6 3V CHECK THE 6 3V...

Page 21: ...HE VOLTAGE AT PIN10 14 17 22 OF IC801 ABOUT 5V CHECK 5V SUPPLY CIRCUIT CHECK THE SIGNAL OUT ABOUT 0 7VP P CHECK SIGNAL CABLE OR INTERFACE CARD CHECK THE CLAMP PULSE OF IC801 PIN27 CHECK THE RELATIVE C...

Page 22: ...VOLTAGE OF IC802 PIN12 ABOUT 83V AND IC802 PIN2 ABOUT 12V CHECK THE 83V 12V SUPPLY CIRCUIT OR MAIN BOARD CHECK THE VOLTAGE OF CRT CATHODE ABOUT 50VP P CHECK THE RELATIVE CIRCUIT OF IC802 OUT PUT CHEC...

Page 23: ...IRCUIT CHECK IC101 PIN33 34 CHECK THE IC601 PIN1 ABOUT 11 8V PIN 4 ABOUT 12V CHECK D601 C605 6 9 Vertical center NG READJUST V CENTER RELATIVE CKT CHECK IC401 AND IC601 6 10 Side pin cushion distortio...

Page 24: ...K NG YES NO CHECK BRIDGE RECTIFIED CHECK START C K T CHECK IC101 CHECK D925 CHECK Q911 Q911 FAILURE CHECK IC901 CHECK AC LINE VOLT 120V OR 220V CHECK F901 SW901 CHECK LINE RECTIFIED SMOOTHED VOLT CHEC...

Page 25: ...00 S IC901 1 20 COIL E 00004074 73C 147542 H L401 1 21 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 22 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 23 2SC5905 E 00004089 57C 706508 Q...

Page 26: ...004060 56C 625500 S IC901 1 20 COIL E 00004074 73C 147542 H L401 1 21 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 22 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 23 2SC5905 E 000040...

Page 27: ...S IC901 1 COIL E 00004074 73C 147542 H L401 1 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 2SC5905 E 00004089 57C 706508 Q403 1 BC547B E...

Page 28: ...34 P 00004101 45C 76 20 RN PE BAG FOR MONITOR 1 35 P 00002871 45C 76 28 V3 PE BAG FOR MANUAL 1 36 N A 45C 76 34 RN PE BAG FOR BASE V000 0 37 N A 45C 88601 C EPE COVER 1 38 N A 50C 500500 CABLE TIE 2...

Page 29: ...E 00003272 64C178J824 1T 0 82UF 100V C439 1 108 N A 65C 2K103 3A6921 0 01UF 2KV C919 1 109 E 00004473 65C 2K121 5A6921 120PF 2KV C488 1 110 E 00004473 65C 2K121 5A6921 120PF 2KV C489 1 111 N A 65C305...

Page 30: ...128 SCREW M3x8 1 181 N A 705C995DC5704P Q901 ASS Y 1 182 N A 750A55379951AI 19 MPRII CRT ASS Y E750A 0 183 N A 750A55379951AK 19 TCO CRT ASS Y E750A 0 184 N A 705C995DAC101P AC ASS Y 1 185 N A 705C995...

Page 31: ...625 95C 90 23 JUMPER J056 0 260 E 00003625 95C 90 23 JUMPER J057 0 261 E 00003625 95C 90 23 JUMPER J058 0 262 E 00003625 95C 90 23 JUMPER J059 0 263 E 00003625 95C 90 23 JUMPER J060 0 264 E 00003625 9...

Page 32: ...1C 17215452T CFR 150K OHM 5 1 4W R479 1 338 N A 61C 17215452T CFR 150K OHM 5 1 4W R488 1 339 N A 61C 17215452T CFR 150K OHM 5 1 4W R962 1 340 N A 61C 17220252T CFR 2KOHM 5 1 4W R155 1 341 N A 61C 1722...

Page 33: ...5 1 6W R181 1 412 N A 61C 60227252T CFR 2 7K OHM 5 1 6W R153 1 413 N A 61C 60227352T CFR 27K OHM 5 1 6W R412 1 414 N A 61C 60233152T CFR 330 OHM 5 1 6W R436 1 415 N A 61C 60233152T CFR 330 OHM 5 1 6W...

Page 34: ...1 487 N A 93C 3951352T HZ6C2 E ZD104 1 488 N A 93C 3951352T HZ6C2 E ZD105 1 489 E 00003628 93C 3951652T TZX5V1B ZD106 1 490 E 00002740 93C 3951852T TZX8V2A ZD901 1 491 N A 93C 3952752T HZ33 2 E ZD704...

Page 35: ...5T6921 220PF 1KV Y5P 10 C920 1 565 N A 65C 1K470 2T6921 47PF 1KV C928 1 566 N A 65C 1K681 2T6921 680PF 1KV C720 1 567 N A 65C 2K221 5T6921 220PF 2000V C413 1 568 N A 65C 2K221 5T6921 220PF 2000V C414...

Page 36: ...3101 31 100PF 50V C113 1 639 N A 65C0603101 31 100PF 50V C130 1 640 N A 57C 419513 BC847C Q731 1 641 N A 57C 419513 BC847C Q751 1 642 N A 57C 420519 T BC857C Q710 1 643 N A 65C0603101 31 100PF 50V C11...

Page 37: ...0210252T CFR 1K OHM 5 1 6W R818 1 717 N A 61C 60211352T CFR 11K OHM 5 1 6W R832 1 718 N A 61C 60211352T CFR 11K OHM 5 1 6W R833 1 719 N A 61C 60211352T CFR 11K OHM 5 1 6W R834 1 720 N A 61C 60218252T...

Page 38: ...471 5T 470PF 10 50V Y5P C808 1 790 N A 65C 450104 3T 0 1UF 50V Y5V C846 1 791 N A 65C 450104 7T 0 1UF 80 20 50V Y5V C818 1 792 N A 65C 450104 7T 0 1UF 80 20 50V Y5V C849 1 793 N A 65C 4501047TV 0 1UF...

Page 39: ...LS Q426 1 835 N A 90C 275503 HEAT SINK 1 836 N A M1C1730 8128 SCREW M3x8 1 837 N A 9C 203 9 PIN 1 838 E R 0405 0377 61C 58 9T NTCR 10OHM 20 5A THIN NR901 1 839 N A 61C 58 9W NTCR 10OHM 20 5A WALS NR90...

Page 40: ...Model G90fB 4 Title Date Rev 8 Exploded Diagram And Spare Parts List ViewSonic Corporation Confidential Do Not Copy G90fB 4 37...

Page 41: ...AD 1 PCS 5 N A 33C6337 1 LENS 1PCS 6 N A 33C6336 E7 T POWER KNOB 1 PCS 7 N A 1C 503 5T 47 SCREW 4 PCS 8 N A 85C6024 506 SHIELD 1 PCS 9 C 00004891 34C6286 E7 T REAR COVER 1 PCS 10 HW 00002749 Q1C 340 1...

Page 42: ...PRE AMP On screen display Q403 T402 FBT HOR O P Q402 T401 HOR DRIVER IC601 STV8172A VERT O P EHT G1 G2 FOCUS IC405 UC3843 EHT 26KV H HV CRT R SIGNAL CABLE G B R G B V IC101 SAA4849PS V1016 CRYSTAL 48...

Page 43: ...29 SwiChoice ISCL ISDA Mute G1 Hs Vs DSCL ROTA Pro H LIN Unlock CLAMP VsOUT CS1 CS2 NC OFF VSSE VDDD V5V VSSD BDRV HBGND HDRV HFB Iref Vref AGND Bsens Bin BOP Vssa VDDA MODE XTAL1 XTAL2 NC REM EEP W R...

Page 44: ...SAA4849 ViewSonic Corporation Confidential Do Not Copy G90fB 4 41...

Page 45: ...M24C08 BN6 IC102 8 5 6 1 2 3 7 4 VCC ISDA ISCL A0 A1 A2 WP A4 IC601 TDA8172 2 6 3 7 1 4 5 Vs Vb FB I P I P 12V O P ViewSonic Corporation Confidential Do Not Copy G90fB 4 42...

Page 46: ...3 4 23 24 5 6 7 8 9 10 15 16 17 18 19 20 21 22 11 12 14 13 V FLY CAPA VDD1 GND1 CLAMP H FLY R G B GNDPLL VCO VCC 2OUT 1OUT GND VDD B G R ABL SDA SCL 3OUT CAP D ViewSonic Corporation Confidential Do N...

Page 47: ...LM2465 IC802 56C551 521 4 8 9 6 2 3 1 7 5 Vcc Vbb I P I P B O P G O P R O P I P GND ViewSonic Corporation Confidential Do Not Copy G90fB 4 44...

Page 48: ...IC901 TEA1507P 1 2 3 4 5 6 7 8 VCC GND CTRL DEMAG SENSE DRIVER NC DRAIN LM2480NA IC803 56C539 6 1 2 3 4 5 6 7 8 Ri Gi Bi GNDVCC Bo Go Ro ViewSonic Corporation Confidential Do Not Copy G90fB 4 45...

Page 49: ...71KHz 83KHz SW102 R419 22K 1 2W 0 324V 47 R119 TZX5V1B ZD106 10K J015 HCadj 1 286V 4 7K R123 12V HUNLOCK 0 005V 45KHz 51KHz 2K2 R138 H LIN 5 015V 40 5KHz 45KHz CS3 4 7K R149 0 01uF C123 56C1125 575 X...

Page 50: ...5K6 1 2W Q908 BC547B R902 NC 5 1V J018 D942 NC U4KB80R BD901 2 1 3 4 RY901 4 3 1 2 6 5 12V 0 47 1 4W R924 C939 1000UF 16V C936 100UF 100V TCET1103 CN901 1 2 3 57C724 502 73A174 7 S3G C944 1000UF 25V 1...

Page 51: ...V R714 33K 1 10W R473 4K7 R404 10 R400 39 1W D408 FMQ G2FS C452 0 1uF 100V BEAD Q427 BC517 D714 1N4148 190V HI R482 33K C421 4 7uF Q403 2SC5905 C401 1uF 160V R605 2K2 R449 NC 1uF 250V C427 D740 RGP10D...

Page 52: ...805 100 C825 S TEST DDC 5V ZD802 NC 100 R842 80V 100P C812 8K2 R816 BEAD 100P C827 B 33 R805 0 1uF C832 0 1uF C834 80V 6 3V 1N4148 D801 0 033uF C817 1N4148 D804 1000 C820 1N4148 D806 G_GND 0 1uF C810...

Page 53: ...11 PCB Layout Diagrams 11 1 Main PCB Layout ViewSonic Corporation Confidential Do Not Copy G90fB 4 50...

Page 54: ...11 2 CRPC Board Layout ViewSonic Corporation Confidential Do Not Copy G90fB 4 51...

Page 55: ...Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Exploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout Diagrams B Are you satisfied with this Service Manual Item Exc...

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