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

ViewSonic E90fB-4 Service Manual

19" digital controlled color monitor
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Service Manual

ViewSonic E90fB-4
Model No. VCDTSXXXX-X
19" Digital Controlled Color Monitor
(E90fB-4_SM_884 Rev. 1a – Jun. 2005)
"
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Confidential-Do Not Copy
ViewSonic Corporation
E90fB-4
1

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  • Page 1: Service Manual

    Service Manual ViewSonic E90fB-4 Model No. VCDTSXXXX-X 19” Digital Controlled Color Monitor (E90fB-4_SM_884 Rev. 1a – Jun. 2005) “ ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • 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

    3. Front Panel Function Control Description 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 Confidential-Do Not Copy ViewSonic Corporation 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 Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 7 17. Power Consumption Modes : <75W typical (Green LED) Sleep <5W(Amber LED) <5W 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) Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • 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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • 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. Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 15 Q403 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. Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 17 COLOR TEMPERATURE ROTATION OSD EXIT H-DRIVER COMPENSATION MAX V-SIZE GAIN RANGE H-SIZE GAIN H-MOIRE REDUCE SUB H-SIZE V-MOIRE REDUCE TOP CORNER H-Linearity Modify V-FOCUS ADJUST BOTTOM CORNER V-HV Variation rate ajust BURN IN TIME Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation 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. Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 20: Trouble Shooting Flow Chart

    LESS THAN 300V 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 21 CHECK IC801 PIN19/PIN20/PIN21 RELATIVE CIRCUIT 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 22: Abnormal Display

    CHECK THE IC802 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 23 RELATIVE CIRCUIT 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+ Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 24 CHECK THE RELATIVE CIRCUIT OFQ406 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 25: Abnormal Vertical Scanning

    CHECK IC101 AND IC601 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 26: Power Supply Trouble Shooting Chart

    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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 27: Recommended Spare Parts List

    7. Recommended Spare Parts List E90fB-4 RSPL E90fB-4 BOM Part Number Description Location Quantity Unit CMP985D1NVSC CHASSIS FOR P985D-1VSC 1C 503 5T 47 SCREW FOR CRT 5C 38 8 RUBBER WASHER 11C 112500 WIRE MOUNT 11C 115500 FBT CLIP 19C 403 7...
  • Page 28 77C 602 1 CJ TACT SWITCH TSVB-2-T-NP <SW102> 77C 602 1 CJ TACT SWITCH TSVB-2-T-NP <SW103> 77C 602 1 CJ TACT SWITCH TSVB-2-T-NP <SW104> 95C 201 69012 WIRE HARNESS A1-A2 95C 201 69032 WIRE B1-B2 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 29 FERRIRE CORE 28.5*17.5* FBTF 71C 100501 S CORD FBTG2 19C 553500 SPRING PIECE GND-PIN 19C 553500 SPRING PIECE GND-PIN 95C8013 14607 WIRE HARNESS H802 56C1125575 X SAA4849PS IC101 56C1133508 M24C08-WBN6P IC102 56C 625500 S TEA1507P IC901 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 30 80C995D 1 N1 TRANSFORMER T901 9C 211 2 PIN 1.2X15MM TP402 75A 335473 CFVR 47K OHM +-20% VR701 75A 334222 CFVR 2.2K OHM +-20% VR902 AMP985D1NVSC 715C1576 1 CMPC 67C 305470 3T 47UF +-20% 16V C100 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 31 4.7UF +-20% 50V C434 67C 30547910T 4.7UF 160V C436 67C 305221 3T 220UF +-20% 16V C483 64C178J104 0T CL21X0.1UF 63V +-5% C494 64C178J102 0T 1000PF +-5% 63V C601 67C 309471 3T 470UF +-20% 16V C603 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 32 93A 64 1152T DIODE 1N4148 D409 93A 64 1152T DIODE 1N4148 D450 93C 6450752T BAV21 D460 93C 6026T52T RECTIFIER DIODE FR107 D463 93C 6026T52T RECTIFIER DIODE FR107 D470 93C 6026T52T RECTIFIER DIODE FR107 D473 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 33 J080 61A 58450 WT 45OHM NTCR FOR THIMKING NR601 9C 203 8 BRASS PIN P402 57A 516 1 T TRAN PH2369 TAPING Q401 57C 734 1 BSN254A Q402 57C 446 3 T 2SC2120-Y Q404 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 34 CFR 100 OHM+-5% 1/6W R122 61C 60247252T CFR 4.7K OHM+-5% 1/6W R123 61C 60210252T CFR 1K OHM+-5% 1/6W R124 61C 60247152T CFR 470 OHM +-5% 1/6W R125 61C 60210352T CFR 10K OHM+-5% 1/6W R126 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 35 CFR 4.7K OHM+-5% 1/6W R166 61C 60224252T CFR 2.4K OHM +-5% 1/6W R167 61C 17233252T CFR 3.3KOHM+-5% 1/4W R168 61C 60210152T CFR 100 OHM+-5% 1/6W R172 61C 60224252T CFR 2.4K OHM +-5% 1/6W R181 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 36 61C 17247252T CFR 4.7K OHM +-5% 1/4W R486 61C 17222252T CFR 2.2KOHM+-5% 1/4W R487 61C 17222452T CFR 220KOHM+-5% 1/4W R488 61C 60233352T CFR 33K OHM+-5% 1/6W R489 61C 60247152T CFR 470 OHM +-5% 1/6W R601 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 37 61C 20733252T 3.3K 1/2W R918 61C 17247852T 0.47OHM 1/4 W R920 61A212Y10552T MGFR 1M OHM+-5% 1/2W R921 61C 17247852T 0.47OHM 1/4 W R923 61C 17247852T 0.47OHM 1/4 W R924 61C 17247852T 0.47OHM 1/4 W R925 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 38 BRASS RV17 6C 31 4 BRASS RV18 6C 31502 BRASS RV19 6C 31500 EYELET 6C 31502 BRASS RV20 6C 31502 BRASS RV22 6C 31502 BRASS RV24 6C 31502 BRASS RV25 6C 31502 BRASS RV26 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 39 FILTER FB803 71C 55 21 FERRITE BEAD 10*6.0*0.8 FB809 9C 203 8 BRASS PIN 9C 203 8 BRASS PIN GND2 56C 366509 LM1246DKA/NA/NOPB IC801 71C 55503 FERRITE BEAD J809 71C 55503 FERRITE BEAD J810 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 40 65C251K104 2T 0.1UF 250V C834 65C 2K101 5T6921 100PF/2KV C835 65C 2K101 5T6921 100PF/2KV C836 65C 44447113T 470PF +-10% Z5P 50V C837 64C176J104 0T 0.1UF 5% 63V C838 65C 44268013T 68PF +-5% NPO 50V C839 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 41 CFR 20K OHM+-5% 1/6W R813 61C 60210252T CFR 1K OHM+-5% 1/6W R814 61C 17215152T CFR 150 OHM +-5% 1/4W R815 61C 60220352T CFR 20K OHM+-5% 1/6W R816 61C172S47152T RES CF 5% 1/4W 470OHM A R817 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 42 2SJ584LS Q911 5C 71 1 TRANSISTOR HOUSING 32C3028504 MICA 90C6055700 HEAT SINK M1C1730 8128 SCREW M3x8 M1C1730 10128 SCREW M3x10 M1C1730 12128 SCREW 93C 220505 DMV1500M-AOC D408 57C 705 7 PHILIPS 1500V/12A BU252 Q403 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 43 SDI 19" DFTM CRT 65C 1K470 5T6921 47P/1KV C450 95C 90 23 JUMPER C480 95C201F 50162 16" PULSE TP405 750C55372AV SDI 19" DFTM CRT 65C 1K470 5T6921 47P/1KV C450 95C 90 23 JUMPER C480 95C2070501 WIRE HARNESS Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 44: Exploded Diagram And Spare Parts List

    7. Exploded Diagram And Spare Parts List...
  • Page 45 E90fB-4 Exploded Parts List Item Part Number Description Q’ty 23C3182 - 1 LOGO 1 PCS 34C6285-AE7 - F BEZEL 1PCS 33C6339- E7 - F OSD KNOB 1PCS 33C6338 -E7 - F KEY PAD 1 PCS 33C6337 - 1 LENS 1PCS...

  • Page 46: Block Diagram

    9. BLOCK DIAGRAM Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 47 Unlock CLAMP 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 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 48 SAA4849 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 49 IC102 ISCL ISDA M24C08-BN6 IC601 TDA4863AJ FLYBACK GENERATOR +O/P +I/P POWER AMPLITIER -I/P THERMAL PROTECTION Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 50 IC801 LM1246DKA V FLY H FLY CAPA CLAMP VDD1 GND1 GNDPLL 1OUT 2OUT 3OUT CAP D Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 51 IC801 LM1246DKA IC901 TEA1507P DRAIN DRIVER CTRL SENSE DEMAG Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 52 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 53 IC802 LM2476 OUTD1 IND1 OUTD2 IND2 IND3 OUTD3 INC1 OUTC1 INC2 OUTC2 INC3 OUTC3 Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 54: Schematic Diagrams

    4.801V 5.557V C123 R146 R147 R125 C702 LED3 1000UF LED4 10000P Green Orange 0.01 100V KEY1 SinColor 1/4W R183 R182 4.802V 0.276V R181 R115 R162 56A1125-575-x R155 J022 R127 2.4K 1/4W R163 ZD101 81A3-7-GP Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 55 IC101 PIN39 IC601 PIN5 Q403 B Q403 C T901 PIN2 IC801 PIN21 IC802 PIN3 Q911 G IC901 PIN1 85Hz 40KHZ~58KHZ 5.41V 5.56V 11.9V 12.1V 13.7V 0.6KV 11.7V 500V 5.12V 1.14KV 52.4V >58KHZ 85HZ 85Hz LED1为单色发光二极管,POWERSAVING时为绿闪;LED2为双色发光二极管; Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 56 L405 C425 R904 MODEL: P/N: 73C253-69-T 0.24uF/400V Safety 2K7 1/4W P985D-1 Engineer R412 C422 47K 1/4W 2.2uF/100V C714 68K 1/4W Q406 Date: APPROVED Thursday, July 21, 2005 4.7U 16V IRF630M R403 R433 57A600-21 EWOUT Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 57 R829 C801 47UF/100V 100OHM 33 1/2W 1UF/100V 560PF R846 C835 D802 BAV21 R814 0.68 1W D809 93A64-501-52T 100P BYV26C 93C1060-501-52T D801 FB809 R804 BEAD JUMPER 100 1/2W L805 FOCUS ER106 C825 C834 0.1U 33A3278-13D Confidential-Do Not Copy ViewSonic Corporation E90fB-4...

  • Page 58: Pcb Layout Diagrams

    11 PCB LAYOUT 11-1 MAIN PCB LAYOUT Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 59 11-2 CRT BOARD LAYOUT Confidential-Do Not Copy ViewSonic Corporation E90fB-4...
  • Page 60 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) Confidential-Do Not Copy ViewSonic Corporation...

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