ViewSonic P90F Service Manual

6 Function Keys Description: (a) Key function: Power switch: This is a “software Key”, Turns the display on and off. The power indicator will lit “Gr

7 In main menu (1), selected “main menu (1) and then pressing up or down key to the top or bottom of this menu, the next pressing will go to main me

8 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 “vi

9 ViewSonic Corporation Confidential – Do Not Copy . 5. MECHANICAL PARTS & MECHANICAL ASSEMBLYP90f-1

10 P90f Mechanical Parts list NO. DESCRIPTION PART NO. QTY M1 FRONT COVER 5642286900 1 M2 BACK COVER 5642287000 1 M3 FUNCTION KEY 5642

11 6. CONNECTOR PIN ASSIGNMENTS 6-1 The Pin-assignments of the 15pin D-sub male miniature connector are shown below: 6-2 15 Pin Min D-su

12 7. MONITOR INSTALLATION Monitor Installation How to Install the Connections to y

13 8. ELECTRONIC CIRCUIT DESCRIPTION 8-1 SWTCHING MODE POWER SUPPLY SECTION 8-1-1 Features 1. AC input: 100Vac – 240Vac. 2. When Power Saving activ

14 8-1-2-8 Under-voltage protection If Ac input voltage is too low, voltage across C844 will be too low that force Q814 to turn off and voltage acr

15 When the sync signals are both exist, then IA01 will send Low at pin 13 to switch on the relay BR801 via Q104 and Q104A and thus produce a very hi

Service Manual ViewSonic P90f-1Model No. VCDTS23483-1 19” Digital Controlled Color Monitor (P90f_SM_525 - Rev. 1a –

16 H. sync., V. sync feed from IA01 pin41,42 to I301 pin1 ,2. When the H. Freq. is over 110kHz or below 30kHz, I301 will shut down to protect the Hor

17 8-3-2 HORIZONTAL OUTPUT STAGE The horizon. drive pulse output at pin 26 is pulled up to 12V to drive Q404 and then coupled via T401 to output

18 converter to drive horizontal deflection output Q433 via L401. The width, pincushion, trapezium information are modulated on the DC converter by c

19 When the voltage at pin 17 of I501 drops under 6V, contrast of display start to decrease. R167 set the light output where the contrast (or full wh

20 Brightness control: Pin 2 of IA01 provides Brightness control. It feed through P903 to base of Q960 to vary R, G, B bias at cathodes simultaneousl

21 9. ADJUSTMENT The adjustment data with tolerance is only for setting to the optimum performance. SERVICE ADJUSTMENT LOCATIONS Main Board (parts si

22 RASTER BEZEL B A |A-B|=0.5—1mm 9-2 High voltage a). Apply PC signal with 31.47kHz / 60Hz(640 x 480) Mode and full white pattern to the monitor.

23 Item Adjustment Description SPEC. (3)Horizontal. Width Adj. (Every Mode) *Pattern: Crosshatch *Brightness: Center. Contrast: Max.

24 Item Adjustment Description SPEC. (b)Parallelogram (Every Mode) *Parallelogram Adj.: Select Parallelogram Icon Press UP OR DOWN Key. t

25 Item Adjustment Description SPEC. <a>.9300°K bias Adj. *Enter preset OSD menu. *Mode 9: 1280 x 1024 Pattern : 11(Black patte

ii Copyright Copyright  2002 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcri

26 <c>.9300°K Gain Adj. *Enter preset OSD menu *Mode 9 : 1280 x 1024 *Pattern : 70mm x 70mm White block. *Brightness : 0.06FL(backgr

27 (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 Norma

28 YES NO NO YES YES YES NO NO NO NO NO YES 10. TROUBLESHOOTING FLOW CHART SECTION 1 Q811 on, Q812 off

29 SECTION 2 Blank Screen LED Amber Check pin 23,21of IA01 pin17= High, pin18= Low Go to SECTION 1 SMPS troubleshooting char

30 SECTION 3 NO

31 SECTION 4 G2 = 400 to 650 V (Do not clockwise turn the Screen VR to extreme ) No Raster High Voltage

32 SECTION 5 DC at Source of Q402 = 190Vapprox. Display is Vertical. Line (No Horizontal output) Check SMPS DC outpu

33 SECTION 6 I310 Pin1,Pin7 Input proper ? Pin 2 of I310 = 15V approx. Pin4 of I310 = -15.V approx. Display is Horizontal.

34 SECTION 7 SECTION 8 No OSD Check IIC Bus (P903A to P904). Press Enter key, there should be

35 11. REPLACEMENT PARTS LIST WARNING: Replacement parts that have special characteristics important to safety should be replaced only with types ide

TABLE OF CONTENTS 1. PRECAUTIONS AND NOTICES...1~2 2. SPECIFICATIONS ...

36 CKT NO. Part no. Description C136 5213622091 C. EL 50V 22UF M C137 5271147401 C. ME 100V 0.47UF J C139 5214019612 C. EL 100V 330UF M C301

37 CKT NO. Part No. Description C803A 5230105401 C. CE 400Vac 2200PF M C804 5270112601 C. ME 275Vac 0.22UF K C804A 5270111091 C. ME 275Vac

38 CKT NO. Part no. Description CA25 5242210191 C. CE 50V 100PF J CA26 5242210191 C. CE 50V 100PF J CA27 5231310291 C. CE 50V 1000PF K SEMIC

39 D403 6611029306 DIODE RECTIFIER 3AP6 D404 6611018703 DIODE RECTIFIER BY329X-1500S 1500V 8A D407* 6613003032 DIODE SWITCHING 1N4148-TD 75V 1

40 D820 (RB) 6613002248 DIODE SWITCHING 1N4935 D820 (RC) 6611035644 DIODE RECTIFIER RGP10D D821* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA

41 IC CKT NO. Part no. Description I101 (RA) 6644063111 IC LINER UC3842BN I101 (RB) 6644063112 IC LINER DBL3842 I301 6644076308 IC LINER D

42 TRANSISTOR CKT NO. Part no. Description Q104 6621015332 TRANSISTOR NPN HF 2SC1815Y Q104A 6621015332 TRANSISTOR NPN HF 2SC1815Y Q104A 6621

43 CKT NO. Part no. Description Q415 (RA) 6621026430 TRANSISTOR NPN BF422 Q415 (RB) 6621026401 TRANSISTOR NPN BF422 Q416 (RA) 6626000605 TRA

44 COIL CKT NO. Part no. Description B801 5062122949 CORE, BEAD RH03506ST-B L101 5064433025 COIL, PEAKING TRF-8330J 33UH J L102 5064433025

45 RESISTOR CKT NO Part no. Description R100 5130420206 R. CF 2W 2K J R100A 5130420206 R. CF 2W 2K J R101 5142433490 R. CF 1/2W 330K J R102

ViewSonic Corporation1 1. PRECAUTIONS AND NOTICES 1.1 SAFETY PRECAUTIONS 1) Observe all cautions and safety related notes located inside the display

46 CKT NO Part no. Description R322 5142110195 R. CF 1/6W 100 J R323 5142110195 R. CF 1/6W 100 J R324 5142815395 R. CF 1/4W 15K J R325 51428

47 CKT NO Part no. Description R806 5142882495 R. CF 1/4W 820K J R807 5130324803 R. FU MOF 1W 0.24 J R808 5142815395 R. CF 1/4W 15 K J R809

48 CKT NO Part no. Description RA23 5142110395 R. CF 1/6W 10K J RA24 5142151195 R. CF 1/6W 510 J RA24A 5142156295 R. CF 1/6W 5.6K J RA25 514

49 BASE & PIN CKT NO Part no. Description P02A P301 5057415224 WIRE ASS’Y W/15P CONNUL/CSA1007#24 L=330MM P302 5057404300 WIRE ASS’Y W

50 ASSEMBLY PCB-PFC CKT NO Part no. Description C1 5214147012 C. EL 100V 47UF C2 5213422191 C. EL 25V 220UF D1 6611035644 RGP10D D2 66130030

51 ASSEMBLY PCB PURITY ASSEMBLY, PCB-PURITY 5097609000 CKT NO. Part no. Description CAPACITOR C501 5236310491 C. BL 50V 0.1UF Z C502 52363104

52 CKT NO. Part no. Description R503 5142127095 R. CF 1/6W 27 J R504 5142127095 R. CF 1/6W 27 J R505 5142827095 R. CF 1/4W 27 J R506 5142827

53 ASSEMBLY PCB-CRT DRIVE (PWB-0414) CAPACITOR CKT NO Part no. Description C900 5242210191 C. CE 50V 100PF J C900A 5242210191 C. CE 50V 100P

54 SEMICONDUCTOR. DIODE CKT NO Part no. Description D901* 6613003032 DIODE SWITCHING 1N4148-TD 75V 150mA (RA.RB.RC.RD) D902* 6613003032 DIO

55 CKT NO Part no. Description L941 5062133201 BF30TA-2.5 X 3 X 1B L942 5064456845 COIL, PEAKING TRF-8568M 0.56UH K L951 5062122902 CORE,BEAD

2 1.8 Voltage Breakdown Test Connent the live and neutral connections together. Switch the monitor on/off switch to on Apply 1500VAC RMS or 2250VDC,

56 RESISTOR CKT NO Part no. Description R900 5142110295 R. CF 1/6W 1K J R901 5142175095 R. CF 1/6W 75 J R902 5142113395 R. CF 1/6W 13K J R9

57 RESISTOR CKT NO Part no. Description R987 5142120095 R. CF 1/6W 20 J R988 5142120095 R. CF 1/6W 20 J R991 5142139495 R. CF 1/6W 390K J R

2 Main PCB circuit(PWB-0404) ViewSonic Corporation 12. SCHEMATIC DIAGRAM

Video drive circuit(PWB-0414) 59 ViewSonic Corporation Confidential – Do Not Copy P90f-1

Purity Circuit (PWB-0417) ViewSonic Corporation 60 ViewSonic Corporation Confidential – Do Not Copy P90f-1

PFC Circuit (PWB-0344) ViewSonic Corporation 61 ViewSonic Corporation Confidential – Do Not Copy P90f-1

Main PCB circuit(PWB-0404) 14. PCB LAYOUT 62 ViewSonic Corporation Confidential – Do Not Copy P90f-1

1 63 ViewSonic Corporation Confidential – Do Not Copy Video drive circuit(PWB-0414) P90f-1

64 ViewSonic Corporation Confidential – Do Not Copy P90f-1

65 ViewSonic Corporation Confidential – Do Not Copy Purity Circuit (PWB-0417) P90f-1

3 2. SPECIFICATIONS ViewSonic Corporation Confidential – Do Not Copy Size and deflection angle 19 inch 90 degree Screen type Flatron Horizontal p

PFC Circuit (PWB-0344) 66 ViewSonic Corporation Confidential – Do Not Copy P90f-1

4 3. TIMING CHART Mode 1~ 13 : Preset Mode Mode 14,15,16: Only for H-size limitation and Auto-size Mode NO. 1 2 3 4 5 6 7 8 Unit Pixel Cloc

5 4. CONTROL LOCATION AND FUNCTIONS Power S.WPower LightAuto SizeSelect KeyOSDON/OFFDown KeyUp KeyFront15 Pin D Sub Video CablePower CordRearViewSon