ViewSonic A90f+-1 VCDTS23307-2R Service Manual
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ViewSonic A90f+-1 VCDTS23307-2R Service Manual

ViewSonic A90f+-1 VCDTS23307-2R Service Manual

19” digital controlled color monitor
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Service Manual

ViewSonic A90f+-1
Model No. VCDTS23307-2R
19" Digital Controlled Color Monitor
(A90f+-1_SM_602-Rev. 1.0-October 2002)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic A90f+-1 Model No. VCDTS23307-2R 19” Digital Controlled Color Monitor (A90f+-1_SM_602-Rev. 1.0-October 2002) 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

    6. Electronic Circuit Description .........13 7. Adjustment ..............19 8. Troubleshooting Flow Chart..........28 9. Recommended Spare Parts List........35 10. Electrical Parts List............37 11. Block Diagram..............53 12. PCB Layout..............54 13. Schematic Diagram............57 14. Exploded Diagram............64 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 4: Precautions And Notices

    A reading of less than 3.5mA should obtained (ref. EN60950). Equipment Under test Isolating transformer Equipment safety Earth terminal Measuring instrument Fig. 1 Measurement of AC Leakage Current ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 5 SR801 CSA-SS-212DM5 RELAY 5054613402 F801 250V/3.15A FUSE 5054431539 T801 TPW-697 POWER TRANSFORMER 5061369700 T101 (RA) TFB-280T TRAQNS.FLYBACK COLOR 5062628031 T101 (RB) TFB-280L TRAQNS.FLYBACK COLOR 5062628032 V901 (RA) M46QCK761X123 (TCO CCRT/DY 5051286346 MDT) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 6: Specification

    –40 C to +60 C Environmental Conditions Operating Humidity 10% to 90% Storage Humidity 10% to 95 % Dimensions W x H x D 575 mm x 600mm x 630mm Weight 25.5Kg (Gross) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 7 16.667 0.613 0.04 VESA 1280 X 1024 79.976 12.504 9.481 1.837 1.067 13.329 12.804 0.475 0.038 75Hz 75.025 VESA 1024 X 768 48.363 20.677 15.754 2.462 2.092 16.666 15.880 0.600 0.124 60.004 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 8: Control Location And Functions

    3. Control Location and Functions Front view UltraBrite Mode Power switc Power switch UltraBrite Mode “1” key Led indicator Auto Sizing Down “2” key Rear view 15 pin D Sub AC input ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 9 “ Icon. Fig. 0 Factory OSD Menu 4.2 User OSD menu descriptions Press “1” key to display a basic main menu (1) shown as below. FIGURE 1( USER MODE OSD MENU 1) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 10 The three default color modes (9300k, 6500k, 5000k) are factory preset, User can select these default colors but can’t adjust and save. If “USER COLOR” is selected, then pressing “2” key will display next sub menu as below to start color adjustment. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 11 In main menu(2), if “LANGUAGE” is selected, then pressing “2” key will display next sub menu as below for languages selection If “view meter” is selected, then pressing “2” key will display next sub menu as below to display timing information. (VIEWMETER) Normal brightness / High brightness ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 12: Disassembly Instructions

    Degaussing coil cover. (Fig 4-4) connector and the CRT grounding connector from the FBT shield. 4. Disassembly Instructions (Fig 4-1) (Fig 4-2) (Fig 4-4) (Fig 4-3) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 13 4.CRT Removal a) CRT is supplied as ITC. b) Remove 4 screws (F) from the front cover (Fig4-7) to move the CRT CAUTION: Do not lift the CRT by the neck. (Fig 4-7) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 14: General Connections & Applications

    5-1.The Pin-assignments of the 15pin D-sub male miniature connector are shown below: 15 Pin Min D-sub male connector PIN NO PIN DESCRIPTION GREEN BLUE NO CONNECTION GROUND R-GROUND G-GROUND B-GROUND +5V PC97 GROUND NO CONNECTION SDA FOR DDC H.SYNC. V.SYNC. SCL FOR DDC ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 15: Monitor Installation

    ( ).To connect Power Cord between your monitor and wall outlet, you have to connect the power cord to the monitor power input socket on back of the monitor. Plug the other end of the power cord into your surge protector or properly-grounded electrical outlet. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 16: Electronic Circuit Description

    When output voltages are too high, voltage across C817 will be high and voltage drop on R872 is also high. It will force Q808, Q807 to conduct and pin8 of UC3842 to ground. Thus UC3842 stop to operate. ViewSonic Corporation A90f+-1...
  • Page 17 I901 and I903 will operate normally. Pin 17 ~ pin 20 provide the logic to control the horizontal CS linear correction circuit according to the horizontal frequency range as the following table. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 18 The controlled currents are independent of Horizontal. Freq. The PLL 2 thus compensates for the delay in the output horizontal deflection CKT by adjusting the phase of the HDRV (pin26) output pulse. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 19 I301 will linearly increase with a charge time of determining by R326 and C308 to modulate B+ duty. Horizontal DC centering circuit is build by Q423, Q424. By controlling the small current flow in or out of L405, it will provide DC center compensation for CDT. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 20 Grid 1 of CDT. When monitor turns off, pin3 (H.UNLOCK) is pull high to turn off Q108 via D108. Grid 1 of CDT is then pulled down to most negative voltage from pin7 of FBT to protect CDT. ViewSonic Corporation A90f+-1...
  • Page 21 Q933, Q963 individually. The DC bias of the cathode is then varied to optimize the color temperature of background. Brightness control: Pin 2 of IA01 provides Brightness control. It feed through P903 to base of Q910 to vary R, G, and B bias at cathodes simultaneously. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 22: Adjustment

    Increase adjust value or clock wise select Icon 7-1 B+ ( 82V) output voltage adjustment a). Apply Chroma 2225 signals with any pattern to the monitor. b). Connect AC input and power on the monitor. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 23 Turn on the monitor by pressing power switch and OSD on/off key at the same time, release power switch and continue to press enter key, then release the enter key after display appears. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 24 1). Pattern: CHROMA 2250, Pattern 1. Brightness: Center. Contrast: Max. 264 2mm 2-a). Select ”Vertical Height” Icon. (Every Mode). -b).Pressing ”UP or DOWN” Key and (Every Mode.). Adjust ”Video display” to 264 +/- 1 mm. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 25 2). Pressing “ UP or DOWN” Key and adjust (Every Mode) to get the best. d).Keystone Adjustment 2-d). Keystone Adjusts: 1). Select “Keystone” Icon. 2). Pressing “UP or DOWN” Key and (Every Mode) adjust to get the best. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 26 ” Adjustment. , Pin-corner Icon. (Every Mode). b). Press “UP or DOWN” Key to adjust. (9). Brightness. Brightness set at Center. . Brightness: Center. (10). Contrast. Contrast set at Max. Contrast: Max. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 27 *Brightness: 95; Contrast: max. *Select ”Color” Icon. Select 5000 K /Su50: 1).R,G,B bias : set at 107 ( Samsung ), 2).adjust “ R,B “ bias to: x =0.310 0.004, y =0.310 0.004. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 28 6500K, and 50 +/- 0.3 FL for * Test point: CRT center. Sup65(high brightness), then adjust “ R,B” Gain to x=0.313 0.01, y =0.329 0.01; Y (6500K): 41 +/- 1FL Y (Sup65): 70 +/- 1 F/L. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 29 *Mode 13: 1280 x 1024, 75 HZ. *Brightness: center 1. Color: 9300 K, only. (9300 K. Only) Contrast: max. 2. Pattern: 27.5~29. FL (Full *Pattern: Pattern 41 (Full White). White). Adjust ABL VR(R167) to 29 0.5 F/L. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 30 (15). Language set up. Set “English “as default. (16).Zoom setting. Press recall to set at center. (17) Key setting. preset mode (set finish) set at : a). “HR” Icon: off. b). “KEY” mark: on. ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 31: Troubleshooting Flow Chart

    8. Troubleshooting Flow Chart SECTION 1 No power Fuse open? Check D801, D802, D803, D800 Check: Q433, Q402 Check: Q121, Q124, FBT (T101) Check: R807, R831 Q801 Check D816, D817, D815, D850, D819, D818 short? ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 32 Connectors P901, P902 Check pin 23,21of IA01 Check if XA01 Check B+(5V) Pin23= High, pin21= Low waveform exist ? to IA01 exist ? Replace MCU (IA01) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 33 Check SMPS DC O/P Check G2 (P906) build by Q114, 115, 116 (SECTION 1) connection Is the voltage 6.3V at heater? Check CRT R, G, B cathode and G1 Check P904, P903 connection ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 34 T101(FBT) Screen VR to extreme ) Check I C bus from Pin27,28 I301 Pin3 of IA01 to HUNLOCK HIGH ? IA02,I301,I901 P401CONNECTION proper ? Check IA01 and its peripheral CKT Replace IA01 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 35 Drain of Q402 Proper ? Is output of Q400,Q421 proper ? Is Q404 output proper ? Is output at Pin 28 Is output at Pin 26 of I301 proper? of I301 proper ? REPLACE I301 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 36 Pin 2 of I310 = 15 V approx. Pin4 of I310 = -15 V approx Check S.M.P.S. DC output. I310 Pin1,Pin7 Input proper ? Are there output at pin 3,5 of I301 ? Check I301 AND Peripheral CKT ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 37 Check I C Bus (P903A to P904). Press Enter key, there should be a sequential pulse appear for I C communication I903 Vdd = 5V ? Check I903 and its peripheral circuit ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 38: Recommended Spare Parts List

    9. Recommended Spare Parts List LEAD TIME LOCATION VIEWSONIC P/N PART NO. DESCRIPTION PCB ASSEMBLY: 3 WEEKS U0334 Main Board. PWB-0334B. 3 WEEKS U0414 B-CRT-0217-0093 5053104140 Video Board. PWB-0414. 3 WEEKS U0488 5053104880 Control Board. PWB-0488. CABINETS: 3 WEEKS 6V04...
  • Page 39 I903 E-IC-0401-2068 6646025603 IC.MTV038N20-17 OSD IC 8 WEEKS I904 E-IC-0401-2388 6644009606 IC.LM2435 T (VIDEO AMP) 8 WEEKS V901A M-MS-0808-7346 5056306721 SOCKET 0330-7700-44(CDT) 3 WEEKS SA01-SA07 M-SW-0815-0203 5054512980 SCWITCH SKHHPM2520 PL 3 WEEKS ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 40: Electrical Parts List

    Before replacing any of these components, read carefully the product safety precautions. Do not degrade the safety of the display through improper servicing ABBREVIATIONS: 10.ELECTRICAL PARTS LIST LOCATION VIEWSONIC P/N PART NO. DESCRIPTION CAPACITOR: E-C-0404-4749...
  • Page 41 C.CE 2KV 330PF K E-C-0404-4756 C413 5214222991 C.EL 160V 2.2UF M E-C-0404-4363 C414 5206422991 C.EL 250V 2.2UF M E-C-0404-4365 C415 5214019512 C.EL 25V 1000UF M E-C-0404-4387 C416 5270207401 C.ME 400V 0.22UF J ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 42 C.EL 16V 1000UF M E-C-0404-4748 C881A 5234318191 C.CE 2KV 180PF K E-C-0404-1171 C882A 5234327191 C.CE 2KV 270PF K E-C-0404-4750 C883 5234333101 C.CE 2KV 330PF K E-C-0404-3352 C886 5276110491 C.ME 100V 0.1UF J ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 43 CA25 5242210191 C.CE 50V 100PF J E-C-0404-1118 5242210191 CA26 C.CE 50V 100PF J E-C-0404-4140 CA27 5231310291 C.CE 50V 1000PF K LOCATION VIEWSONIC P/N PART NO. DESCRIPTION DIODE: E-D-0403-1853 D101 6611032640 DIODE DIODE RECTIFIER BYV26DGP 800V 1A E-D-0403-1751 D104* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA,RB,RC)
  • Page 44 DIODE ZENER HZ5C 1-TD 4.9-5.1 E-D-0403-1751 DA04* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC) E-D-0403-1751 DA05* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC) E-D-0403-1751 DA06* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC) ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 45 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC) E-D-0403-1868 DA12 6615007834 DIODE ZENER HZ5C 1-TD 4.9-5.1 *1N4148: RA 6613003032 RB 6613003037 RC 6613003048 #1N4002: RA 6611007240 RB 6611007244 RC 6611007243 RD 661100 LOCATION VIEWSONIC P/N PART NO. DESCRIPTION INTEGRATED CIRCUIT: E-IC-0401-0277 I101(RA) 6644063111...
  • Page 46 TRANSISTOR NPN 2SC1815Y E-Q-0402-1360 QA01 6621015332 TRANSISTOR NPN 2SC1815Y E-Q-0402-1360 QA02 6621015332 TRANSISTOR NPN 2SC1815Y E-Q-0402-1360 QA03 6621015332 TRANSISTOR NPN 2SC1815Y LOCATION VIEWSONIC P/N PART NO. DESCRIPTION COIL: E-L-0407-1379 B801 5062122949 CORE,BEAD RH03506ST-B E-L-0407-1511 L101 5064433025 COIL,PEAKING TRF-8330J 33UH J E-L-0407-1511...
  • Page 47 COIL,HOR.CHOKE CHK-230A E-L-0407-1383 L875 5062202300 COIL,HOR.CHOKE TLN-2026 E-L-0407-1380 L876 5062122971 CORE,BEAD RH035078ST-B E-L-0407-1506 L877 5062123001 CORE,CHOKE CHK-230A LOCATION VIEWSONIC P/N PART NO. DESCRIPTION RESISTOR: E-R-0405-6751 R100 5130420206 R.CF 2W 2K J E-R-0405-6751 R100A 5130420206 R.CF 2W 2K J E-R-0405-3872 R101 5142433490 R.CF 1/2W 330K J...
  • Page 48 5136005006 R.MOF 5W 1.0K E-R-0405-6518 R419 5142110195 R.CF 1/6W 100 J E-R-0405-3195 R420 5142810295 R.CF 1/4W 1K J E-R-0405-5884 R426 5142815495 R.CF 1/4W 150K J E-R-0405-3217 R427 5142847395 R.CF 1/4W 47K J ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 49 R.CF 1/4W 12 J E-R-0405-6551 R845 5142151195 R.CF 1/6W 510 J E-R-0405-3199 R847 5142851295 R.CF 1/4W 5.1 K J E-R-0405-2472 R848 5142843395 R.CF 1/4W 43K J E-R-0405-6525 R850 5142110295 R.CF 1/6W 1K J ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 50 R.CF 1/4W 2.2 K J E-R-0405-6545 RA43 5142139295 R.CF 1/6W 3.9K J E-R-0405-6520 RA44 5142110395 R.CF 1/6W 10K J E-R-0405-6520 RA45 5142110395 R.CF 1/6W 10K J E-R-0405-6520 RA46 5142110395 R.CF 1/6W 10K J ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 51 RA53 5142147295 R.CF 1/6W 4.7K J E-R-0405-6549 RA54 5142147295 R.CF 1/6W 4.7K J E-R-0405-3892 RA55 5142812295 R CF 1/4W 1.2K J LOCATION VIEWSONIC P/N PART NO. DESCRIPTION RELAY: E-RL-0414-0105 SR801 5054613402 RELAY OSA-SS-212DM5 TRANSFORMER: T101(RA) E-FBT-0406-0242 5062628031 TRANSFORMER,FLYBACK COLOR TFB-280T-31...
  • Page 52 C.BL 50V 0.1UF Z E-C-0404-4358 C983 5213322191 C.EL 16V 220UF M E-C-0404-4137 C983A 5236310491 C.BL 50V 0.1UF Z DIODE: E-D-0403-1751 D901* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA E-D-0403-1751 D902* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 53 TR NPN HF H945P E-Q-0402-1419 Q933 6621026430 TR NPN HF BF422 E-Q-0402-1419 Q963 6621026430 TR NPN HF BF422 Q987(RA) E-Q-0402-1360 6621015332 TR NPN HF 2SC1815Y Q987(RB) E-Q-0402-1420 6621015335 TR NPN HF H945P ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 54 R.CF 1/6W 1.3K J E-R-0405-6555 R970 5142156295 R.CF 1/6W 5.6K J E-R-0405-5883 R972 5142813395 R.CF 1/4W 13K J E-R-0405-6511 R973 5142843095 R.CF 1/4W 43 J E-R-0405-6544 R974 5142133295 R.CF 1/6W 3.3 K ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 55 TACT SWITCH SKHHPM2520-PL M-SW-0815-0203 5054512980 SA07 TACT SWITCH SKHHPM2520-PL E-D-0403-1837 DA01 6618018400 DIODE LED CSL F500YG2MT AMBER / GREEN P304A 5057408057 WIRE ASS'Y W/08P CONN.EMR/JAM CORE PA06A 5057403414 WIRE ASS'Y W/08P CONN.A2502/B2513 L=250MM ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 56: Block Diagram

    A90f+ (F19FSVZ) Control Control Regulator BLOCK DIAGRAM ACV Input Regulator Rectifier Filter 100/240VAC +193V Protection +82V Switching +15V To Time base & Video CKT Transistor Controller -15V Frequency Feedback ON/OFF reduction Control Control ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 57: Pcb Layout

    12. PCB Layout ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 58 VIDEO PWB-0414 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 59 KEY CONTROL PWB-0488 ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 60: Schematic Diagram

    13. Schematic Diagrams MAIN BOARD ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 61 VIDEO ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 62 KEY CORTROL ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 63 POWER SUPPLY CKT ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 64 MCU CONTROL CKT ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 65 Time Base & DeflectionCKT ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 66 H.V & DYNAMIC FOCUS CKT ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...

  • Page 67: Exploded Diagram

    14. Exploded Diagram ViewSonic Corporation A90f+-1 Confidential – Do Not Copy...
  • Page 68 M20 M-CV-0830-0222 COVER FOR CRT DRIVE SHIELD 5646246900 M21 M-MS-0808-6646 DRIVE CADR SHIELD PLATE 5646246301 M22 M-MS-0808-7979 SPONGE 5642021705 M23 M-MS-0808-7575 VIEWSONIC DECORATE 5642417700 M24 M-MS-0808-8229 BOTTOM METAL BRACKET 5648735600 M-SCW-0824-0525 SCREW PHB+CW+RW M5x24 7190561001 M-SCW-0824-0523 SCREW PZP M4x10 7134251482...

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