ViewSonic P90F User 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 - [phone]

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Copyright
Copyright

2002 by ViewSonic Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. 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.
Trademarks
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision Date Description Of Changes Approval
1a 4/17/02 Initial Release DCN-2207 K.Yang
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TABLE OF CONTENTS
1. PRECAUTIONS AND NOTICES...........................................................................1~2
2. SPECIFICATIONS ....................................................................................................3
3. TIMING CHART ........................................................................................................4
4. CONTROL LOCATION AND FUNCTIONS ..........................................................5~8
5. MECHANICAL PARTS & MECHANICAL ASSEMBLY......................................9~10
6.CONNECTOR PIN ASSIGNMENTS........................................................................11
7. MONITOR INSTALLATION......................................................................................12
8. ELECTRONIC CIRCUIT DESCRIPTION ..........................................................13~20
9. ADJUSTMENT..................................................................................................21~27
10. TROUBLESHOOTING FLOW CHART............................................................28~34
11. REPLACEMENT PARTES LIST......................................................................35~57
12. SCHEMATIC DIAGRAMS ...............................................................................58~61
13. PCB LAYOUT..................................................................................................62~68
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1. PRECAUTIONS AND NOTICES
1.1 SAFETY PRECAUTIONS
1) Observe all cautions and safety related notes located inside the display cabinet and on the
displaychassis.
2) Operation of this display outside the cabinet or with the cover removed, involves at shock
harzard from the display power supplies. Work on the display should not be attempted by anyone
who is not thoroughly familiar with precautions necessary when working on high voltage
equipement.
3) Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles
are worn. People not so equiped should be kept away while handling picture tube.Keep picture
tube away from body while handling.
1.2 Observe all cautionary and safety related notes located on the chassis, cabinet and display tube.
1.3 Operation of the monitor with the back cover removed presents a potential shock hazard. Only
personnel familiar with the precautions necessary for safe working on high voltage equipment
should attempt to carry out servicing.
1.4 Always wear shatter proof goggles when removing, installing or generally handing the picture tube.
People not so equipped should be kept at a safe distance when any such handing is being
undertaken. Do not handle the picture tube by the neck of deflection coil. Do not carry the picture
tube resting against the body.
1.5 The picture tube is designed and constructed to limit X-Radiation to a safe level during normal
operation. To maintain the required level of protection and safe operation, replacement tubes
must be correctly adjusted and any protective circuits must not defeat.
1.6 IMPORTANT-Safety Tests
After servicing, and before returning the monitor to the user, a thorough safety test must be
carried out to ensure there is no potential shock hazard to any operator(s) using the monitor.
All the following test must be performed. A monitor failing any of these tests should be rejected
and have the problem rectified.
1.7 A.C. Leakage Test
Remove the power sourse. Connent the monitor to the circuir as in figure 1 below. Switch the
monitor on/off switch to on. A reading of less than 3.5mA should obtained (ref. EN60950).
Equipment safety
Earth terminal
Equipment
Under test
Measuring instrument
Isolating
transformer
L
N
Fig.1 Measurement of AC Leakage Current.
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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, 50Hz for one minute between live and neutral shorted together and
earth. Ensure no voltage breakdown occurs.
1.9 Earth Resistance/Continuity Test
Measure the resistance between the signal cable metal shell and the earth pin in the A.C. socket.
At a current of 25 amperes the resistance should be less than 100m.
NOTE:A portable appliance tester (PAT) is a suitable instrument to use for the above safety tests.
1.10 H.V. Over Voltage Portection (Required for X-Radiation Safety)
Adjust R176 slowly anti-clockwise until the over voltage protection circuit is activated, and the high
voltage must be less than 33KV at this moment. After test, R176 should be adjusted back to
normal(=26.2KV)
CAPACITOR:
C850 400V 4700PFM CAPACITOR.CERAMIC 5230105501
C851 400V 4700PFM CAPACITOR.CERAMIC 5230105501
C135 250V 33UFM CAPACITOR.ELECTROLYTIC 5214433012
C139 100V 330UFM CAPACITOR.ELECTROLYTIC 5214019612
RESISTOR
R827 1K RESISTOR.VS 5162161020
SEMICONDUCTORS
I101, I803 UC3842N IC LINEAR 6644063111
I301 (RA) TDA9116 SDIP32 IC.LINEAR A.S.D.C. 6644076308
I301 (RB) TDA9113 SDTP-32 IC.LINEAR A.S.D.C. 6644076305
I310 TDA8172 7P IC.LINEAR 6644076000
IA01 NT68F62U IC.LSI MCU FLASH MTP 6647008204
Q801 2SK2648-01 TR FET MOS 6626003208
Q433 2SC5587AS TR NPN HF 6621040405
Q121 2SK2843 TR FET MOS 6626003203
D807 RD20EB2-T1 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
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2. SPECIFICATIONS
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Size and deflection angle 19 inch 90 degree
Screen type Flatron
Horizontal pitch / Dot pitch 0.24mm
Surface treatment Anti-static AR coating
CDT
Transmission rate 46%
Horizontal Frequency 30kHz to 110KHz
Scanning
Freq. Vertical Frequency 50Hz to 180Hz
Video amplifier Applicable pixel rate 265MHz
Resolution Maximum 1600 x 1200 @85Hz
Modes Factory preset/User modes 12/ 14
AC input range 100 to 240 Vac
Max. power consumption <130W
Suspend <4W
Power
Power Management Off <4W
Power Switch On/off with Led indicator
Up/Down adjustment Key
2 key pads for adjust
Up / down keys are direct access for Contrast
And Brightness adjustment
“2” Key As a select key/ go to next sub menu
User controls
Auto-size Key Auto-sizing
Signal
connections
Standard Model 1.8 m signal cable with 15Pin D shell miniature
male connector.
Rear
connection
Power input AC socket with 1.8 meter cable
Safety CB,BSM2,VPSB,C-TICT,TUV/S(Argentina)
Emissions EN50081-1
Immunity EN50082-1
ISO9241Paart3 &ISO9241Part8
Ergonomic ZH1/618
VLMF MPRII
European
Safety UL1950
Emissions FCC class B
USA
X-ray DHHS
Safety EIAJ
Agency
Approvals
Japan Emissions VCCI category 2
Plug and Play DDC 1/2 B Version 2
Operating Temperature
Storage Temperature
10°C to 40°C
–30°C to +60°C
Operating Humidity 10% to 90%
Environmental
Conditions
Storage Humidity 10% to 95 %
Dimensions W x H x D 475.8 mm x 492.1mm x470.7mm
Weight Kg 24.05Kg (Gross)
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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 Clock 25.175 25.175 30.24 56.25 78.75 80.0 94.5 135 MHz
Resolution 640x400 640x480 640x480 800x600 1024x768 1024x768 1024x768 1280x1024
Horizontal Frequency 31.469 31.469 35 53.674 60.023 60.241 68.677 79.976 KHz
(A) Horizontal Period 31.779 31.778 28.571 18.631 16.660 16.6 14.561 12.504 usec
(B) Horizontal Pulse
Width 3.813 3.813 2.116 1.138 1.219 1.2 1.016 1.067
usec
(C) Horizontal Back Porch 1.907 1.907 3.175 2.702 2.235 2.2 2.201 1.837 usec
(D) Horizontal Active Area 25.422 25.422 21.164 14.222 13.003 12.8 10.836 9.481 usec
(E) Horizontal Front Porch 0.637 0.636 2.116 0.569 0.203 0.4 0.508 0.119 usec
(F) H. Sync. Polarity - - - + + - + +
Vertical Frequency 70.087 59.94 66.667 85.061 75.029 74.927 84.997 75.025 Hz
(O) Vertical Period 14.269 16.683 15 11.756 13.328 13.346 11.765 13.329 msec
(P) Vertical Pulse Width 0.064 0.064 0.086 0.056 0.050 0.050 0.044 0.038 msec
(Q) Vertical Back Porch 1.112 1.049 1.114 0.503 0.466 0.498 0.524 0.475 msec
(R) Vertical Active Area 12.712 15.253 13.714 11.179 12.795 12.749 11.183 12.804 msec
(S) Vertical Front Porch 0.381 0.317 0.086 0.018 0.017 0.049 0.014 0.012 msec
(T) V. Sync. Polarity + - - + + - + +
(U) Interlaced No No No No No No No No
Mode NO. 9 10 11 12 13 14 15 16
Unit
Pixel Clock 157.5 202.5 229.5 261 57.28 40 49.5 36 MHz
Resolution 1280 x
1024 1600x1200 1600x1200 1792x1344 832x624 800x600 800x600 640x480
Horizontal Frequency 91.146 93.75 106.25 106.27 49.725 37.8 46.875 43.269 KHz
(A) Horizontal Period 10.971 10.667 9.412 9.41 20.111 26.4 21.333 23.111 usec
(B) Horizontal PulseWidth 1.016 0.948 0.837 0.828 1.117 3.2 1.616 1.556 usec
(C) Horizontal Back Porch 1.422 1.501 1.325 1.349 3.910 2.2 3.232 2.222 usec
(D) Horizontal Active Area 8.127 7.901 6.972 6.866 14.524 20 16.162 17.778 usec
(E) Horizontal FrontPorch 0.406 0.316 0.279 0.368 0.560 1 0.323 1.556 usec
(F) H. Sync. Polarity + + + - - + + +
Vertical Frequency 85.024 75 85 74.997 74.5 60 75 85.008 Hz
(O) Vertical Period 11.761 13.333 11.765 13.334 13.414 16.579 13.333 11.764 msec
(P) Vertical Pulse Width 0.033 0.032 0.028 0.028 0.060 0.106 0.064 0.069 msec
(Q) Vertical Back Porch 0.483 0.491 0.433 0.649 0.784 0.607 0.448 0.578 msec
(R) Vertical Active Area 11.235 12.8 11.294 12.647 12.549 15.84 12.8 11.093 msec
(S) Vertical Front Porch 0.011 0.011 0.009 0.009 0.021 0.017 0.021 0.023 msec
(T) V. Sync. Polarity + + + + - + + +
(U) Interlaced No No No No No No No No
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4. CONTROL LOCATION AND FUNCTIONS
Power S.W
Power Light
Auto Size
Select Key
OSD
ON/OFF
Down Key
Up Key
Front
15 Pin D Sub Video Cable
Power Cord
Rear
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Function Keys Description:
(a) Key function:
Power switch: This is a “software Key”, Turns the display on and off. The power indicator will lit “Green”
when the display is on.
“1” key: Turn on /off OSD menu / Exist this menu to go back previous menu.
: Down side to select item / decrease value.
: Up side to select item / increase value.
. keys are direct access for Contrast and Brightness adjustment.
(b) “2” key: a select key / go to next sub menu.
(c) Pressing “2” & power keys at same time will enter the factory optimized OSD Menu.
(d) Selected ∩icon and then pressing “2” key will do demagnetize CDT, if pressing maintain to
more than 3 sec will de force MCU to enter burn in state for production line burning.
(e). Press key will auto adjust the display.
Factory OSD Menu
OSD menu descriptions:
Press “1” key to display a basic main menu (1) shown as below.
Using and keys to move a cyan window bar get your desired items. If it is selected, then pressing
“2” key to display Sub menu as below to start adjustment.
Use and to decrease / increase value on selected item. Noted that the menu can do two items
adjust pressing “2” change to another one in toggle.
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