ViewSonic PerfectFlat E90fB-4 Service Manual
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ViewSonic PerfectFlat E90fB-4 Service Manual

ViewSonic PerfectFlat E90fB-4 Service Manual

19” color monitor
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Service Manual

ViewSonic E90fB-4
Model No. VS10794
TM
19" PerfectFlat
Color Monitor
(E90fB -4 _SM Rev. 1a Nov. 2005)
®
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic PerfectFlat E90fB-4

  • Page 1: Service Manual

    Service Manual ViewSonic E90fB-4 Model No. VS10794 19” PerfectFlat Color Monitor (E90fB -4 _SM Rev. 1a Nov. 2005) ® ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: 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 3: 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 E90fB -4...

  • 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 E90fB -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 E90fB -4...

  • Page 6: Specification

    352 mm(H) ×264 mm(V) Scanning Frequencies Horizontal: 30KHz ~ 86KHz Vertical: 50 Hz ~ 160 Hz Factory Preset Timings: 9 User Timings: 10 Misconvergence A Zone: 0.25 mm Max. B Zone: 0.35 mm Max. ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 7 <75W max (Green LED) Sleep <4W (Amber LED) <2W 18. Regulatiory/Safety UL/CUL, FCC-B, CB, CE, DHHS, ICES 003, NOM, TUV/GS, TUV/Ergo, MPRII, GOST-R, SASO, BSMI, CCC, PSB, Argentina-TUV/S, EPA Energy Star (Y2005 tier1) ViewSonic Corporation Confidential - Do Not Copy E90fB -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 E90fB -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 E90fB -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 E90fB -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 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 14 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 E90fB -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 E90fB -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 E90fB -4...
  • Page 17 OSD EXIT H-DRIVER COMPENSATION MAX V-SIZE GAIN RANGE H-MOIRE REDUCE H-SIZE GAIN V-MOIRE REDUCE SUB H-SIZE TOP CORNER H-Linearity Modify BOTTOM CORNER V-FOCUS ADJUST V-HV Variation rate ajust BURN IN TIME ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 18 F. adjust R or G or B gain, make x=283±10, y=297±10, Y=150±5 cd/m ,then save it into 9300K color temprature G. After modulation, it’s necessary to check if the white balance accords with the normal specification. If not, which needs reset. ViewSonic Corporation Confidential - Do Not Copy E90fB -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 E90fB -4...

  • Page 20: Trouble Shooting Flow Chart

    CHECK FBT BRIGHTNESS SET TO MAX. THEN CHECK CRT G1 VOLTAGE CHECK BRIGHTNESS CIRCUIT Q705 RELATIVE CIRCUIT CHECK VOLTAGE OF THE CRT CATHODE ABOUT 56V TO 65V REFER ITEM 6-2 "ABNORMAL ViewSonic Corporation Confidential - Do Not Copy E90fB -4...

  • Page 21: Viewsonic Corporation

    R.G.B. APPROACH STANDARD 6-1-3. 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 E90fB -4...
  • Page 22 RELATIVE CIRCUIT CHECK THE VOLTAGE OF FBT SCREEN ABOUT 400V TO 700V LESS THAN 400V CHECK FBT RELATIVE CIRCUIT EXCEED 700V CHECK FBT & CRT RELATIVE CIRCUIT OR REFER ITEM 6-1 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 23 CHECK THE COLLECTOR VOLTAGE OF Q402 ABOUT 14Vpp CHECK Q402, T401 RELATIVE CIRCUIT CHECK THE COLLECTOR VOLTAGE OF Q403 ABOUT 1200Vpp AT FH:31KHz CHECK T401, T402, Q402, Q403, D408, C418, C419, H-DY, B+ ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 24 CHECK FBT B+ VOLTAGE ABOUT 62V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT 25KV 6-5-2. ABNORMAL HORIZONTAL LINEARITY CHECK L401, Q426, Q420, Q427 AND IC101 PIN9,10,11 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 25 RELATIVE CKT 6-7 . SIDE-PIN CUSHION DISTORTION READJUST CHECK IC101, Q406 RELATIVE CKT. 6-8 . POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 26 RECTIFIED CHECK D925 CHECK START C.K.T R936 CHECK Q 911 Q 911 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 E90fB -4...

  • Page 27: 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 28 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 29 BOM LIST (E90fB-4 for "M & G-Region) ViewSonic Model Number: VS10794-1M/G Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty CMP985D1NVSC B-00004051 CHASSIS FOR P985D-1VSC¡] -4M¡^ B-00004052 CMP985D1NVW CHASSIS FOR B985D-1VSC¡] -4G¡^ #N/A 1C 503 5T 47...
  • Page 30 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 705A995DX9301A X101 ASS'Y #N/A 77C 602 1 CJ TACT SWITCH TSVB-2-T-NP (SW103) #N/A 77C 602 1 CJ TACT SWITCH TSVB-2-T-NP <SW101> TACT SWITCH TSVB-2-T-NP #N/A 77C 602 1 CJ <SW102>...
  • Page 31 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61C152M823 64 R927 MOFR 82K+-5% 2W #N/A 61C152M560 64 R929 MOFR 56 OHM+-5% 2W #N/A 77C 260 5 4 RELAY RY401 RELAY #N/A 77C 260 5 4 RY901 SPARK GAP...
  • Page 32 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 64C178J103 2T MPE 0.01UF 250V +-5% C925 #N/A 65C 2K221 5T6921 220PF 2000V C927 #N/A 65C 1K470 5T6921 47P/1KV C928 47UF +-20% 25V #N/A 67C 305470 4T C929 47000PF -20 +80% 50V Z5...
  • Page 33 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 57C 446500 T 2SC1213C Q743 #N/A 57C 446 1 T 2SC1213ACTZ-E Q902 #N/A 57C 419503 T 2SC945P Q903 2SA733P #N/A 57C 420502 T Q905 2SC1213ACTZ-E #N/A 57C 446 1 T...
  • Page 34 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61C 60224252T CFR 2.4K OHM +-5% 1/6W R181 #N/A 61C 60256252T CFR 5.6KOHM+-5% 1/6W R182 #N/A 61C 60227352T CFR 27K OHM+-5% 1/6W R183 3.6OHM +-5% 1/4W #N/A 61C 17236952T...
  • Page 35 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 61C 60247052T CFR 47 OHM +-5% 1/6W R914 #N/A 61C203S27252T 2.7K 1/2W R915 #N/A 61C 17218052T CFR 18 OHM+-5% 1/4W R916 100KOHM 1/2W #N/A 61C203S10452T R917 3.3K 1/2W #N/A...
  • Page 36 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 93C 39 7752T HZ5C1-E ZD904 #N/A ARP985D1NVSC CRT BAORD #N/A 40C 45762412B LABEL #N/A 87A3504 DL CRT SOCKET #N/A 90C6113 4 HEAT SINK #N/A 705A985DR5601B IC802 ASS'Y C805 #N/A...
  • Page 37 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 93C106050152T BYV26C/TFK D809 #N/A 93C 6450152T SWITCHING DIODE BAV21 D810 E-D-0403-0531 93A 64 1152T DIODE 1N4148 D811 D812 E-D-0403-0531 93A 64 1152T DIODE 1N4148 D813 E-D-0403-0531 93A 64 1152T...
  • Page 38 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty E-00004071 57C 724502 STP9NK70Z Q901 #N/A 90C6118 1 HEAT SINK #N/A M1C1730 6128 SCREW M3x6 Q420 E-00004066 57C 600 14 MOSFET #N/A 9C 203 9 NR901 E-R-0405-0377 61C 58 9T...

  • Page 39: Exploded Diagram And Spare Parts List

    8. Exploded Diagram And Spare Parts List Model E90fB-4 Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 40 EXPLODED PARTS LIST (E90fB-4 for "M & G-Model) ViewSonic Model Number: VS10794-1M/G Rev: 1a Item ViewSonic P/N Ref.P/N Description Q'ty #N/A 23C3182-1 LOGO 1 PCS C-00004054 34C6285-AE7-F BEZEL 1PCS #N/A 33C6339-E7-F OSD KNOB 1PCS #N/A 33C6338-E7-F KEY PAD 1 PCS...

  • Page 41: Block Diagram

    9. Block Diagram ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 42 XTAL2 standby XTAL1 MODE VSSE VDDA VDDD Vssa VSSD BDRV Bsens HBGND AGND HDRV Vref Iref XRAY EWdrv IC101 SAA4849 VOUT2 Vfocus VUOT1 Deguss ABLadj DouColor KEY2 Uvolt KEY1 SinColor 56A1125-575 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 43 SAA4849 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 44 IC102 ISCL ISDA M24C08-BN6 IC601 TDA4863AJ FLYBACK GENERATOR +O/P POWER +I/P AMPLITIER -I/P THERMAL PROTECTION ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 45 IC801 LM1246DKA V FLY H FLY CAPA CLAMP VDD1 GND1 GNDPLL 1OUT 2OUT 3OUT CAP D ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 46 IC801 LM1246DKA IC901 TEA1507P DRAIN DRIVER CTRL SENSE DEMAG ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 47 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 48 IC802 LM2476 OUTD1 IND1 OUTD2 IND2 IND3 OUTD3 INC1 OUTC1 INC2 OUTC2 INC3 OUTC3 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...

  • Page 49: Schematic Diagrams

    R125 R146 R147 C702 LED3 1000UF 10000P LED4 Green 0.01 100V KEY1 SinColor Orange 1/4W R183 R182 4.802V 0.276V R115 R181 R162 56A1125-575-x R155 J022 R127 2.4K 1/4W R163 ZD101 81A3-7-GP ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 50 Q403 C T901 PIN2 IC801 PIN21 IC802 PIN3 Q911 G IC901 PIN1 85Hz 40KHZ~58KHZ 5.41V 5.56V 11.9V 12.1V 5.12V 13.7V 0.6KV 11.7V 500V 1.14KV 52.4V >58KHZ 85HZ 85Hz LED1 ,POWERSAVING ;LED2 ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 51 Q408 FR107 R447 100K 1/4W 57A419-503-T JUMPER 2SC945P L405 C425 R904 73C253-69-T 0.24uF/400V 2K7 1/4W R412 C422 47K 1/4W 2.2uF/100V C714 68K 1/4W Q406 4.7U 16V IRF630M R403 R433 57A600-21 EWOUT ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 52 100OHM 33 1/2W 1UF/100V 560PF R846 C835 D802 BAV21 R814 0.68 1W D809 93A64-501-52T 100P BYV26C 93C1060-501-52T FB809 D801 R804 BEAD JUMPER 100 1/2W L805 FOCUS ER106 C825 C834 0.1U 33A3278-13D ViewSonic Corporation Confidential - Do Not Copy E90fB -4...

  • Page 53: Pcb Layout Diagrams

    11. PCB Layout Diagrams 11-1 MAIN PCB LAYOUT ViewSonic Corporation Confidential - Do Not Copy E90fB -4...
  • Page 54 11-2 CRT BOARD LAYOUT ViewSonic Corporation Confidential - Do Not Copy E90fB -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...

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