ViewSonic G90fB-4 Service Manual
  1. Manuals
  2. Brands
  3. ViewSonic Manuals
  4. Monitor
  5. G90fB-4
  6. Service manual
ViewSonic G90fB-4 Service Manual

ViewSonic G90fB-4 Service Manual

19” digital controlled color monitor
Hide thumbs Also See for G90fB-4:
Table of Contents

Advertisement

Quick Links

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

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the G90fB-4 and is the answer not in the manual?

Questions and answers

Related Manuals for ViewSonic G90fB-4

Summary of Contents for ViewSonic G90fB-4

  • Page 1: Service Manual

    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: Table Of Contents

    4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 3: Revision History

    Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

  • Page 4: Precautions And Safety Notices

    Connect a 1500 ohm, 10 watt resistor, paralleled by a 0.15uF capacitor between each exposed metallic part and a good earth ground (as shown in Fig.1). Use an AC voltmeter with 1000 ohm/volt or more sensitivity and measure the AC voltage across the ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 5 It is essential that these critical parts should be replaced with manufacture’s specified parts to prevent X-RADIATION, shock, fire, or other hazards. Do not modify the original design or this will void the original parts and labor guarantee. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 6: Specification

    +/- 8mm compare to default size and within bezel viewable area. Scanning Frequencies Horizontal: 30KHz ~ 97KHz Vertical: 50 Hz ~ 160 Hz Factory Preset Timings: 10 User Timings: 10 Misconvergence A Zone: 0.25 mm Max. B Zone: 0.35 mm Max. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 7 UL60950, cUL60950 or CSA 22.2; DHHS Part 21, Subpart J X-Ray Protection; FCC, Part 15, Subpart J, Subpart B;ICES-003, Class B; NOM; Argentina – TUV/S International TCO03 (Black);TUV/GS, TUV/Ergo, BSMI,CCC,PSB,CE,GOST-R;ISO9241-3 （covered in TUV-ergo） ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 8: Operating Instructions

    This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable to the PC. If your color display requires service, it must be returned with the power cord. ViewSonic Corporation Confidential - Do Not Copy...

  • Page 9: Front Panel Function Control Description

    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. ViewSonic Corporation Confidential - Do Not Copy...

  • Page 10: Osd Lock Settings

    3 below). Press button [2] to toggle to the next control in the pair. To adjust the setting, such as CONTRAST in the sample below, press the arrow buttons. 4 To save the control setting and Exit the menu press button [1] twice. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 11 Trapezoid adjusts the top and bottom of the screen image until they have equal length. Parallel slants the vertical edges of the screen image until they are parallel. Tilt rotates the entire screen image. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 12 Exception: This control does not affect changes made with the User Color control. OSD Position allows you to move the on-screen display menus and control screens. ViewMeter displays the frequencies (horizontal and vertical) coming from the graphics card of the computer. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 13: Circuit Description

    Via deflection reset after start up (only micro controller reset) The reset pin(pin23) is connected to a Schmitt trigger for nose reduction. A reset is accomplished by holding the Reset pin HIGH. C145 RST Pin23 C102 R153 0.1UF 2.7K x-ray protection ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 14 C register HPFREE( the default value is also 60 kHz).Independent on H-syncs which are possibly present.the HPLL will slew to that freerunning frequency.To achieve an always defined starting point for the startup procedure,this procedure cannot be interrupted. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 15 HOR. Driver Transistor Q417,Q418,Q416,Q420 Horizontal s correction control MOSFET Q406 Transistor for H-Size Control Q705 Brightness Control CKT Q742 V-Dynamic focus CKT Q402 Q403 Driver MOSFET Q901 MOS FET for Switching Power Control. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 16: Adjusting Procedure

    OSD window changed to the Factory preset window. C. The Factory preset window contains the following functional controls. Select one of the control. Then press the Up/Down Key to adjust its value for the optimum picture. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 17 V-MOIRE REDUCE TOP CORNER H-Linearity Modify BOTTOM CORNER V-FOCUS ADJUST V-HV Variation rate ajust BURN IN TIME MAX H-SIZE RANGE SET BURN-IN SUB H-SIZE BOTTOM BALANCE H-SIZE WAVE BALANCE B+ VOLTAGE ADJUST ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 18 G. After modulation, it’s necessary to check if the white balance accords with the normal specification. If not, which needs reset. 4. Focus Adjustment: A. Under 1024×768 Fv: 85Hz with character full page. B. Adjust brightness to center and contrast to max. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 19 F. Vertical green and magenta lines are converged by varying the angle between the two tabs of the 6-pole magnets. G. Horizontal green and magenta lines are converged by varying the two tabs together, keeping the angle between them constant. ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 20: Trouble Shooting Flow Chart

    CRT FAIL ABOUT 60V 6-2. Abnormal DDC (Plug & Play) CHECK IC101 PIN 16 VOLTAGE ABOUT 5V CHECK IC902 GOOD OR FAIL CHECK SIGNAL CABLE OR H802 PIN 2, 4 DATA OUTPUT ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 21 CHECK THE RELATIVE CIRCUIT OF IC802 6-4. No blanking CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF FBT CHECK R821 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT FBT PIN 5 ON MAIN PCB ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 22 6-6. Abnormal horizontal width of video READJUST H-SIZE FUNCTION CHECK RELATION CIRCUIT OF Q406 CHECK B+ VOLTAGE ABOUT 125.5V AT H-FREQUENCY=68KHZ CHECK B+ SUPPLY CIRCUIT CHECK THE HIGH VOLTAGE ABOUT 25.5~26.5V REFERENCE TO ITEM7 ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 23 6-10. Side-pin cushion distortion READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT 6-11. Poor focus READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 24 CHECK THE 56V OUTPUT CHECK BRIDGE RECTIFIED CHECK D925 CHECK START C.K.T R936 CHECK Q911 Q911 FAILURE CHECK T901 O/P IC101 PIN30(ABOUT5V) CHECK 56V, 12V 6.5V CIRCUIT OUTPUT CHECK IC901 IC901 FAILURE CHECK SENSE RESISTENCE ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 25: Recommended Spare Parts List

    All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions. ViewSonic Corporation...
  • Page 26 Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.
  • Page 27 All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions. ViewSonic Corporation...
  • Page 28 BOM LIST (G90fB-4M/E/P) ViewSonic Model Number: VS10794-3M/E/P Rev: 1a Serial No. Prefix: PY9 / PYA / PYC Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00004890 CMP995D1NHVWP CHASSIS FOR P995D-1HSVW #N/A 1C 503 5T 47 SCREW FOR CRT...
  • Page 29 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty TCET 1103 #N/A 56C 139 5 IC902 #N/A 56C 379 16 UC3843ACD IC405 E-00004060 56C 625500 S TEA1507P IC901 E-00004059 56C1125575 X SAA4849PS IC101 M24C08-WBN6P E-00002717 56C1133508 IC102 E-00002859 61C 52 27 4J...
  • Page 30 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 73C 25818110H 180UH L906 #N/A 73C 25818110H 180UH L909 #N/A 73C 25818110T 180UH L902 #N/A 73C 25818110T 180UH L906 #N/A 73C 25818110T 180UH L909 #N/A 75A 334203 VR701 CFVR 20K OHM +-20%...
  • Page 31 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty JUMPER E-00003625 95C 90 23 J017 E-00003625 95C 90 23 JUMPER J019 E-00003625 95C 90 23 JUMPER J020 E-00003625 95C 90 23 JUMPER J021 JUMPER E-00003625 95C 90 23 J023...
  • Page 32 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty JUMPER E-00003625 95C 90 23 J105 E-00003625 95C 90 23 JUMPER J106 E-00003625 95C 90 23 JUMPER J107 E-00003625 95C 90 23 JUMPER J109 JUMPER E-00003625 95C 90 23 J110...
  • Page 33 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty CFR 100 OHM+-5% 1/6W #N/A 61C 60210152T R143 #N/A 61C 60210152T CFR 100 OHM+-5% 1/6W R145 #N/A 61C 60210152T CFR 100 OHM+-5% 1/6W R159 #N/A 61C 60210152T CFR 100 OHM+-5% 1/6W...
  • Page 34 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 10OHM 1/4 W #N/A 61C203S10052T R425 #N/A 61C203S10052T 10OHM 1/4 W R481 #N/A 61C203S10052T 10OHM 1/4 W R487 #N/A 61C203S10052T 10OHM 1/4 W R738 10OHM 1/4 W #N/A 61C203S10052T R934...
  • Page 35 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty IC904 #N/A 56C 158 2 T TL431ACLPR #N/A 57A 516 2 T HPH2369 Q902 #N/A 57C 415502 BC516 Q732 #N/A 57C 419523 T BC337-40 Q414 Q419 #N/A 57C 419523 T...
  • Page 36 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty C145 #N/A 67C 309220 4T 22UF +-20% 25V #N/A 67C 309229 7T 2.2UF +-20% 50V C702 #N/A 67C 309479 7T 4.7UF +-20% 50V C421 #N/A 57C 419513 BC847C Q429 R402...
  • Page 37 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty C852 E-00001202 65C 2M103 3B6921 0.01UF 2KV 20% Z5U #N/A 65C517K103 5A6921 10000PF/500V +-10% Y5P C845 #N/A 67C 305470 9 47UF +-20% 100V C829 #N/A 67C 305470 9 47UF +-20% 100V...
  • Page 38 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty D821 #N/A 93C 6431P52T BAV20 #N/A 93C 6450752T BAV21 D813 #N/A 93C 6450752T BAV21 D814 #N/A 93C 6450752T BAV21 D815 D816 #N/A 93C 6450752T BAV21 #N/A 93C 6450752T BAV21 D817...
  • Page 39 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A M1C1730 10128 SCREW M3x10 #N/A M1C1730 10128 SCREW M3x10 E-00004070 57C 751 4 2SJ584LS Q426 #N/A 90C 275503 HEAT SINK #N/A M1C1730 8128 SCREW M3x8 #N/A 9C 203 9...

  • Page 40: Exploded Diagram And Spare Parts List

    8. Exploded Diagram And Spare Parts List Model G90fB-4 Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 41 EXPLODED PARTS LIST (G90fB-4M/E/P) ViewSonic Model Number: VS10794-3M/E/P Rev: 1a Serial No. Prefix: PY9 / PYA / PYC Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 23C3182 - 1 LOGO 1 PCS C-00004893 34C6285-AFD - T BEZEL 1PCS #N/A 33C6339- E7 - T OSD KNOB...

  • Page 42: Block Diagram

    9. Block Diagram ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 43 VsOUT XTAL2 standby XTAL1 MODE VSSE VDDA VDDD Vssa VSSD BDRV Bsens HBGND AGND HDRV Vref Iref XRAY EWdrv VOUT2 IC101 SAA4849 Vfocus VUOT1 Deguss ABLadj DouColor KEY2 Uvolt KEY1 SinColor 56A1125-575 ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 44 SAA4849 ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 45 IC102 ISCL ISDA M24C08-BN6 IC601 TDA8172 -I/P +I/P +O/P ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 46 IC801 LM1246DKA V FLY H FLY CAPA CLAMP VDD1 GND1 GNDPLL 1OUT 2OUT 3OUT CAP D ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 47 56C551-521 R O/P IC802 G O/P LM2465 B O/P ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 48 56C539-6 LM2480NA IC901 IC803 TEA1507P DRAIN DRIVER CTRL SENSE DEMAG GNDVCC ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 49: Schematic Diagrams

    0.1UF C123 R146 KEY1 Sincolor R147 4.859V 0.191V 0.01uF C108 R164 7.5K R163 1000 CSÕæÖµ±í The test condition of every IC PIN voltage :H-Freq:68KHZ;V-Freq:85HZ;Pattern:white; <33KHz 33KHz~40.5KHz 40.5KHz~45KHz 45KHz~51KHz 51KHz~62KHz 62KHz~71KHz 71KHz~83KHz <83KHz ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 50 D938 240 1/2W 1n/500V SBYV26C IC903 R907 R953 R951 ZD901 5K6 1/2W C482 TZX8V2A Q935 4700UF 16V C928 BT169B 47P/1KV D936 1N4148 P-sense D937 D940 1N4148 1N4148 Q908 C933 BC547B 3.3n 50V ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 51 C705 Q424 R470 C431 22n 50V Q473 4n7 50V IRF640A R724 R474 PH2369 10n 100V R733 4K7 1/8W Q711 adjust R469 H-UNLOCK R731 R725 Q712 ZD712 47K 1/8W R475 560R 1/2W JUMPER ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 52 C824 FB809 C827 0.1uF 100V FB805 Jumper 100P C850 C848 IN4004 C829 FB801 100 1KV 47uF 100V 1nF 1KV BEAD R836 P803 HEADER 11 1O 2W -24.85V D822 P802 HEADER 10/SM FR155 ViewSonic Corporation Confidential - Do Not Copy G90fB-4...

  • Page 53: Pcb Layout Diagrams

    11. PCB Layout Diagrams 11-1. Main PCB Layout ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 54 11-2. CRPC Board Layout ViewSonic Corporation Confidential - Do Not Copy G90fB-4...
  • Page 55 Add: Tel: Fax: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com) ViewSonic Corporation Confidential - Do Not Copy...

This manual is also suitable for:

Vs10794

Table of Contents