ViewSonic P90F Service Manual
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ViewSonic P90F Service Manual

19” digital controlled color monitor
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  • Page 2: Service Manual

    Service Manual ViewSonic P90f -1 Model No. VCDTS23483-1 19” Digital Controlled Color Monitor (P90f_SM_525 - Rev. 1a – April 2002) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • 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: Table Of Contents

    CONTROL LOCATION AND FUNCTIONS ............5~8 MECHANICAL PARTS & MECHANICAL ASSEMBLY ........9~10 CONNECTOR PIN ASSIGNMENTS................11 MONITOR INSTALLATION..................12 ELECTRONIC CIRCUIT DESCRIPTION ............13~20 ADJUSTMENT ....................21~27 TROUBLESHOOTING FLOW CHART............28~34 REPLACEMENT PARTES LIST..............35~57 SCHEMATIC DIAGRAMS ................58~61 PCB LAYOUT....................62~68 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 5: 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 P90f-1 Confidential – Do Not Copy...
  • Page 6 TR PNP HF. 6615011831 D827 HZ5C1 DIODE ZENER 6615007834 OTHERS SR801 OSA-SS-212DM5 RELAY 5054613402 F801 250V/3.15A FUSE 5054431539 T801 TPW-697 POWER TRANSFORMER 5061369700 T101 TFB-280L TRAQNS.FLYBACK COLOR 5062628032 V901 (CA) M46QDG423X04 CCRT/DY 5051286325 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 7: Specifications

    Storage Temperature –30°C to +60°C Environmental Conditions Operating Humidity 10% to 90% Storage Humidity 10% to 95 % Dimensions W x H x D 475.8 mm x 492.1mm x470.7mm Weight 24.05Kg (Gross) ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 8: Timing Chart

    (R) Vertical Active Area msec 11.235 12.8 11.294 12.647 12.549 15.84 12.8 11.093 (S) Vertical Front Porch msec 0.011 0.011 0.009 0.009 0.021 0.017 0.021 0.023 (T) V. Sync. Polarity (U) Interlaced ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 9: Control Location And Functions

    CONTROL LOCATION AND FUNCTIONS Front Power S.W ON/OFF Power Light Down Key Auto Size Up Key Select Key Rear 15 Pin D Sub Video Cable Power Cord ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 10 “2” key to display Sub menu as below to start adjustment. to decrease / increase value on selected item. Noted that the menu can do two items adjust pressing “2” change to another one in toggle. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 11 The three default color modes such as 9300k, 6500k, 5000k only can be set in factory, means, they can read and display only in this menu. If selected “user color”, then pressing “2” key will display next sub menu as below to start color adjustment. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 12 In main menu (2), if selected “LANGUAGE”, then pressing “2” key will display next sub menu as below to language. Select as below: If selected “view meter”, and then pressing “2” key will display next sub menu as below to show timing information. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 13: Mechanical Parts & Mechanical Assembly

    MECHANICAL PARTS & MECHANICAL ASSEMBLY ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 14 P90f Mechanical Parts list DESCRIPTION PART NO. FRONT COVER 5642286900 BACK COVER 5642287000 FUNCTION KEY 5642846000 POWER LIGHT PIPE 5640328200 POWER KEY 5642845900 RUBBER WASHER 5642020001 RING CABLE 5642655600 LEFT BRACKET 5648734100 SPRING FINGER 5648006000 MAIN CHASSIS BRACKET 5648734300 RIGHT BRACKET...

  • Page 15: Connector Pin Assignments

    6-2 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 P90f-1 Confidential – Do Not Copy...

  • Page 16: 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 ent of the power cord into your surge protector or properly-grounded electrical outlet ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 17: Electronic Circuit Description

    When output voltage 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 P90f-1 Confidential – Do Not Copy...
  • Page 18 Q811, Q812 off. The secondary voltages will be reduced further, and Q867, Q866 are turned off. The heater voltage become zero for further lower power consumption than stand- by/suspend Mode. Normal Power supply operation: ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 19 Purity control, through P421, connect to PWB-0417, purity control board. Pin 17 to pin 20 and pin32 provide the logic to control the horizontal CS linear correction circuit according to the horizontal frequency range as the following table. P90f CS Table MCU Pin Capacitor...
  • Page 20 12 with the oscillator saw-tooth wave-form. The controlled currents are independent of Horizon. 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 P90f-1 Confidential – Do Not Copy...
  • Page 21 The B+ drive output of the control block is at pin 28(BDRV), this drive voltage switch Q402 on-off via a buffer build by Q400 and Q401. Q402, act as an step down DC ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 22 Pin 8 of FBT sense the beam current. When beam current rise, base voltage of Q126 drop and so the emitter does. The voltage across C108 drops to pull down the voltage at pin17 of I501. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 23 (g), pin26 (b) respectively, These output magnitude can control the conduction of transistors Q903, Q933, Q963 individually. The DC bias of the cathodes are then varied to optimize the color temperature of back ground. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 24 Through IIC bus (pin 27, 28 of IA01), IA01 communicate with I501 on purity board. I501 is a digital to analog converter. There are four controls on corners of CDT. User can adjust the white uniformity and color uniformity at four corners. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 25: Adjustment

    Apply PC signal with any pattern to the monitor. b). Connect AC input and power on the monitor. c). Brightness at center, contrast at maximum. d). Adjust R827 for the voltage at heat-sink of D816 to 81V ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 26 Adjust until square height of top is equal to bottom S Correction * Open OSD, enter “ ” and select Adjustment “ ” Adjust until square height of top and bottom equal to center. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 27 Using window Horizontal.: Within 2.0mm window Vertical.: Within 2.0mm window (Every Mode) (a)Pin−balance. *Pin−balance Adj.: (Every Mode) Select Pin-balance Icon Press UP OR DOWN Key to correct the Bow distortion to the best. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 28 (Note this Adj. Item is used to correct the four corners in a small quantity) (9).Contrast *Standard pre-set setting is Contrast adjust to the maximum. (10)Color Temperature. Adjustment ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 29 *Color temperature bias shall be adjusted. *Enter preset OSD menu. *Adjust brightness down to 0.06+/-0.01FL. *Power off Monitor , then power on again to check Brightness should be at 50% in User’s OSD menu. ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 30 *4 & 6 Pole magnet adjusted to get optimized convergence, the criteria is: A circle with 264 mm diameter Area: < or = 0.3mm Remaining area: < or = 0.4mm (15) Vertival focus Normally this setting is at 65 setting ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 31 (16) H Moire setting Normally set at 30 for resolution 1280 x 1024 mode (mode 8 and 9) And zero for all other modes (17) V. Moire setting Normally set at zero for all modes ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 32: Troubleshooting Flow Chart

    Q807, Q808 short ? Check if Q433, Q402, short ? Check if Q121, Q124 short ? Load of secondary side If disconnect P902 of short ? video board(PWB-0237) then check I903 I901 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 33 “No Check pin 23,21of IA01 Check if XA01 Check B+ (5V) pin17= High, pin18= Low waveform exist ? to IA01 exist ? Go to SECTION 1 SMPS Replace troubleshooting chart MCU (IA01) ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 34 (SECTION 1) heater? Check P902 connection OK ? Check P904 connection OK ? Check Q121 output 300 Vp-p approx. Check I101 pin 2 > 2.5V Check OVP CKT setting build by Q114,115,116 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 35 HUNLOCK HIGH ? IA02,I301,I901 P410 CONNECTION proper ? Check IA01 and its peripheral CKT TO SECTION 6 : Horiz. TO SECTION 5 : Vert. Replace IA01 Line, No Vert. output line, No Horiz. output ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 36 ? Is output of Q400,Q421 Is Q404 output proper ? proper ? Is output at Pin 28 of Is output at Pin 26of I301 proper ? I301 proper ? REPLACE I301 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 37 Pin 2 of I310 = 15V approx. Check SMPS DC Pin4 of I310 = -15.V approx. output I310 Pin1,Pin7 Input proper ? Are there output at pin 3,5 of I301 ? Check I301 AND Peripheral CKT ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 38 Replace I904 Check IIC Bus (P903A to P904). Press Enter key, there should be a sequential pulse appear for IIC communication I903 Vdd = 5V ? Check I903 and its peripheral circuit ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 39: Replacement Parts List

    C. BL 50V 0.1UF Z C115 5276110491 C. ME 100V 0.1UF J C134 5213610091 C. EL 50V 10UF M C116 5213622091 C. EL 50V 22UF M C135 5214433012 C. EL 250V 33UF M P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 40 C. CE 250Vac 4700PF M C388 5213610191 C. EL 50V 100UF M C802A 5230105401 C. CE 400Vac 2200PF M C390 5233315191 C. CE 1KV 150PF K C803 5230105501 C. CE 250Vac 4700PF M ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 41 C. CE 50V 100PF J C844 5205622091 C. EL 50V 22UF M CA20 5232310291 C. CE 500V 1000PF K C845 5213447091 C. EL 25V 47UF M CA22 5242210191 C. CE 50V 100PF J P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 42 DIODE SWITCHING RGP10G D128 6611019241 DIODE RECTIFIER BYD73G D301 6615007834 DIODE ZENER HZ5C1-TD 4.9-5.1V D310# 6611007240 DIODE RECTIFIER 1N4002RL(RA,RB,RC,RD) D401* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA,RB,RC) D402 (RA) 6615009336 DIODE ZENER BZX79C10 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 43 DIODE RECTIFIER GUF30D D818 (RA) 6611015244 DIODE RECTIFIER UF5402G D818 (RB) 6611018200 DIODE RECTIFIER 30DF2 D818 (RC) 6611015245 DIODE RECTIFIER GUF30D D819 (RA) 6611032641 DIODE RECTIFIER UFRRD 2NU41-TPA1 D819 (RB) 6611032244 DIODE RECTIFIER HER308G ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 44 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC) DA12 5054431539 DIODE ZENER HZ5C1-TD 4.9-5.1 DA15 6618019800 LED HOLDER LAMP CSL-H500YG2HTJ * 1N4148 : RA 6613003032 RB 6613003037 RC 6613003048 #1N4002 : RA 6611007240 RB 6611007244 RC 6611007243 RD 6611007245 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 45 IC MEMORY CMOS EEPROM S524C80D81-DCB0 DIP-8 TRANSFORMER CKT NO Part no. Description T101 (RB) 5062628032 TRANSFORMER, FLYBACK COLOR TFB-280L-31 T401 5062420400 TRANSFORMER, HOR. DRIVE TLN-204, JSI T801 5061369700 POWER TRANSFORMER, SWITCHING TPW-697 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 46 6621026430 TRANSISTOR NPN BF422 Q413 (RB) 6621026401 TRANSISTOR NPN BF422 Q414 (RA) 6626000605 TRANSISTOR FET MOS IRFS630A Q414 (RB) 6626000604 TRANSISTOR FET MOS IRFS630MFP Q414 (RC) 6626004000 TRANSISTOR FET MOSFET N-CH 2SK2161 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 47 TRANSISTOR NPN 2SC1815Y Q866 6624001300 TRANSISTOR PNP 2SB722 Q867 6621015332 TRANSISTOR NPN 2SC1815Y Q872 6621015332 TRANSISTOR NPN 2SC1815Y QA01 6621015332 TRANSISTOR NPN 2SC1815Y QA02 6621015332 TRANSISTOR NPN 2SC1815Y QA03 6621015332 TRANSISTOR NPN 2SC1815Y ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 48 5062122971 CORE, BEAD RH035078ST-B L877 5062123001 CORE, CHOKE CHK-230A CRYSTAL CKT NO Part no. Description XA01 (RA) 6699003504 CST8.00MTW(TCR-1056) RELAY CKT NO Part no. Description SR401 5054633000 RUDH-SS-11201 SR801 5054613402 RELAY OSA-SS-212DM5 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 49 R. CF 1/6W 200K J R157 5130439003 R. MOF 2W 39 J R320 5142115395 R. CF 1/6W 15K J R158 5142810095 R. CF 1/4W 10 J R321 5142122095 R. CF 1/6W 22 J ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 50 5142847395 R. CF 1/4W 47K J GC-P 10D 100 R429 5142815495 R. CF 1/4W 150K J R804 (RB) 5101118400 R. THERMISTOR R430 5142847395 R. CF 1/4W 47K J PROTECTORS 10 L 3A ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 51 R. CF 1/6W 10K J R847 5142851295 R. CF 1/4W 5.1K J RA21 5142110395 R. CF 1/6W 10K J R848 5142843395 R. CF 1/4W 43K J RA22 5142110395 R. CF 1/6W 10K J ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 52 SPARK GAP 200V 1PF (MAX) Z805 (RA) 5202201991 SPARK GAP 200V 1PF (MAX) Z805 (RB) 5202201301 SPARK GAP 200V 1PF (MAX) Z809 (RA) 5202200591 SPARK GAP 1-2KV 1PF(MAX) Z809 (RB) 5202200502 SPARK GAP 1-2KV 1PF(MAX) ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 53 SA03 5054513025 TACT SWITCH SKHHLV1720-TT DC12V 50MA GRAY SA04 5054513025 TACT SWITCH SKHHLV1720-TT DC12V 50MA GRAY SA05 5054513025 TACT SWITCH SKHHLV1720-TT DC12V 50MA GRAY SA06 5054513025 TACT SWITCH SKHHLV1720-TT DC12V 50MA GRAY ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 54 R. CF 1/6W 30K J 5142120395 R. CF 1/6W 20K J 5142456090 R. CF 1/2W 56 J 5142110295 R. CF 1/6W 1.0K J 5142110295 R. CF 1/6W 1.0K J 5054633004 RELAY OMI-SS-212L U0344 5053103440 PWB-0344-00 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 55 TRANSISTOR NPN 2SC1815Y Q514 6621015332 TRANSISTOR NPN 2SC1815Y Q515 6621015332 TRANSISTOR NPN 2SC1815Y Q516 6621015332 TRANSISTOR NPN 2SC1815Y RESISTOR R501 5142127095 R. CF 1/6W 27 J R502 5142127095 R. CF 1/6W 27 J ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 56 R. CF 1/6W 27 J R518 5142127095 R. CF 1/6W 27 J BASE &PIN P501 5056403404 BASE &PIN 4P P502 5056403404 BASE &PIN 4P P503 5056403504 BASE &PIN 5P U0417 5053104170 PWB-0417-01 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 57 C. CE 1KV 100PF K C926B 5233318191 C. CE 1KV 180PF K C927 5231310391 C. CE 50V 10000PF K C930B 5242210191 C. CE 50V 100PF J C931 5213601091 C. EL 50V 1UF M ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 58 L906 5062133201 BEAD CORE L907 6119210605 JUMP WIRE L911 5062133201 BF30TA-2.5 X 3 X 1B L912 5064456845 COIL, PEAKING TRF-8568M 0.56UH K L921 5062122902 CORE, BEAD BL03RN2-R62T4 L935 5062122946 CORE, BEAD RH03506AT-B ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 59 TR NPN HF BF422 Q964 (RA) 6621026430 TR NPN HF BF422 Q964 (RB) 6621026401 TR NPN HF BF422 Q987 (RA) 6621015332 TR NPN HF 2SC1815Y Q988 (RA) 6621015332 TR NPN HF 2SC1815Y ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 60 R. 1/4W 47 J R936 5142810295 R. CF 1/4W 1K J R984 5142830395 R. CF 1/4W 30K J R938 5142443090 R. CF 1/2W 43 J R986 5142124395 R. CF 1/6W 24K J ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 61 SPARK GAP SG05G 1KV 1PF Z974 (RA) 5202201991 SPARK GAP DC200V 1PF DSP-201M-C04F Z974 (RB) 5202201301 SPARK GAP DC200V 1PF GD412-200V-M ASSEMBLY CRT CKT NO. Part no. Description V901 (CA) 5051286325 CCRT/DY M46QDG423X04 LG ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 62: Schematic Diagrams

    12. SCHEMATIC DIAGRAM Main PCB circuit(PWB-0404) ViewSonic Corporation...
  • Page 63 Video drive circuit(PWB-0414) P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 64 Purity Circuit (PWB-0417) ViewSonic Corporation ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 65: Viewsonic Corporation

    PFC Circuit (PWB-0344) ViewSonic Corporation ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

  • Page 66: Pcb Layout

    PCB LAYOUT Main PCB circuit(PWB-0404) P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 67 Video drive circuit(PWB-0414) P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 68 P90f-1 ViewSonic Corporation Confidential – Do Not Copy...
  • Page 69 Purity Circuit (PWB-0417) ViewSonic Corporation P90f-1 Confidential – Do Not Copy...
  • Page 70 ViewSonic Corporation P90f-1 Confidential – Do Not Copy...

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