Text preview for : Viewsonic E70 VCDTS22355-3 VCDTS22037-5m.pdf part of VIEWSONIC E70 11 and 5 Circuito que sirve para el Viewaonic E70 VCDTS22037-5m y para el E70- VCDTS22355-3 . Solo cambian los numeros impresos en la placa,pero practicamente,el resto de componentes es igual. Modelo Board PWB 1539.
CHASIS: 68311539000-02 AÑO 2000 MANUFACTURA
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Service Manual
ViewSonic E70-11
Model No. VCDTS22355-3
17" Digital Controlled Color Monitor
(E70-11_SM_884 Rev. 1a Jun. 2004)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 2004 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
Optiquest is a registered trademark of ViewSonic Corporation.
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 06/01/04 Initial Release DCN- 4484 Angela Lu
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 2
3. Front Panel Function Control Description 6
4. Circuit Description 10
5. Adjusting Procedure 12
6. Trouble Shooting Flow Chart 15
7. Recommended Spare Parts List 22
8. Exploded Diagram And Spare Parts List 39
9. Block Diagram 41
10. Schematic Diagrams 47
11. PCB Layout Diagrams 48
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1. Precautions And Safety Noticess
WARNING!
This service information is designed for experience repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service
a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians.
Any attempt to service or repair the product or products dealt within this service information by anyone else
could result in serious injury or death.
1. CAUTION
No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly
familiar with all of the following safety checks and servicing guide lines.
2. SAFETY CHECK
Care should be taken while servicing this CRT display because of the high voltage used in the deflection circuits.
These voltages are exposed in such areas as the associated flyback and yoke circuits.
3. FIRE & SHOCK HAZARD
3-1 Insert an isolation transformer between the CRT display and AC power line before servicing the chassis.
3-2 In servicing pay attention to original lead dress especially in the high voltage circuit. If a short circuit is found,
replace all parts which have been overheated as a result of the short circuit.
3-3 All the protective devices munt be reinstalled per original design.
3-4 Soldering must be inspected for possible cold solder joints, frayed leads, damaged insulation, solder splashes or
sharp solder points. Be certain to remove all foreign material.
4. LEAKAGE CURRENT COLD CHECK
4-1 Unplug the AC cord and connect a jumper between the two prongs on the plug.
4-2 Turn the CRT display power switch "on".
4-3 Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metallic part
on the CRT display such as the metal frame, screwheads, control shafts, etc. When the exposed metallic part has
a return path to the chassis, the reading should be 1.8 megohm minimum.
5. LEAKAGE CURRENT HOT CHECK
5-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
5-2 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).
5-3 Use an AC voltmeter with 1000 ohm/volt or more sensitivity and measure the AC voltage across the
combination 1500 ohm resistor and 0.15uF capacitor.
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5-4 Move the resistor connection to each exposed metallic part and measure the voltage.
5-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
5-6 Voltage measured must not exceed 7.5 volt RMS, from any exposed metallic part to ground A leakage current
tester may be used in the above hot check, in which case any current measured must not exceed 5.0 milliamp. In
the case of a measurement exceeding the 5.0 milliamp value, a rework is required to eliminate the chance of
shock hazard.
Note High voltage is present when this CRT display is operating. Always discharge the anode of the picture
tube to the display chassis to prevent shock hazard.
AC VOLTMETER
(EARTH
GROUND)
TO
INSTRUMENT'S 0.15£gF
EXPOSED
METAL PARTS 1500 £[ 10W
Fig. 1
6. IMPLOSION PROTECTION
Picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage and
scratching during installation. Use only Panasonic replacement picture tubes.
7. X-RADIATION
WARNINGThe only potential source of X-Radiation is the picture tube. However when the high voltage circuit is
operating properly there is no possibility of X-Radiation problem. The basic precaution which must be exercised is to
keep the high voltage at the following factory-recommended level.
Note It is important to use an accurate periodically calibrated high voltage meter.
7-1 The procedure for adjusting high voltage is shown on page 12.
7-2 If can not be adjust 25.0 KV at immediate service is required to prevent the possibility of premature
component failure.
7-3 To prevent X-Radiation possibility it is essential to use the specified picture tube.
IMPORTANT SAFETY NOTICE
There are special components used in this CRT displays
which are important for safety. These parts are identified
by the international symbol ! on the schematic
diagram and on the replacement parts list. 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.
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2. Specification
1. CRT : 43.2CM(17") 90 Deflection, 29mm Neck, 0.27mm Dot Pitch, Non-Glare Screen
2. Viewable image Size: 40.6CM (16") diagonal
3. Display Color: Unlimited Colors
4. External Controls:
Power On/Off, OSD key, Function knob: Contrast, Brightness, Degauss, H-Size, H-Center, V-Center, V-Size,
ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Color Temperature, H-Moire Reduce,
V-Morie, Memory Recall, Language, ViewMeter. OSD position select
5. Input Video Signal
1 2 3 4 5 6 7 8 9 10 11 12
Mode
Horizontal Freq. (KHz) 31.47 31.47 37.5 43.27 46.87 53.67 60.02 68.67 63.98 35.000 832*624 1024*768
Dot Clock (MHz) 25.18 28.18 31.5 36 49.5 56.25 78.75 94.5 108 30.240 57.283 80.000
Horizontal Lines 720 640 800 1024 1280 640 832 1024
Vertical Lines 400 480 600 768 1024 480 624 768
H. Sync Polarity NEG NEG NEG NEG POS POS POS POS Pos NEG NEG NEG
H. Period (µs) 31.78 31.78 26.67 23.11 21.333 18.63 16.66 14.56 15.63 28.571 20.111 16.600
H. Sync Width (µs) 3.18 3.81 2.03 1.56 1.616 1.138 1.219 1.016 1.037 2.116 1.117 1.200
H. Back Porch (µs) 1.96 1.589 3.81 2.22 3.232 2.702 2.235 2.201 2.296 3.175 3.910 2.200
H. Active (µs) 25.42 25.42 20.32 17.78 16.162 14.22 13 10.83 11.85 21.164 14.524 12.800
Vertical Freq. (Hz) 69.93 59.94 75 85.01 75 85.06 75.02 84.99 60.02 66.667 75.550 74.927
V. Sync Polarity POS NEG NEG NEG POS POS POS POS Pos NEG NEG NEG
V. Period (ms) 14.3 16.68 13.33 11.76 13.333 11.75 13.32 11.76 16.66 15.000 13.414 13.346
V. Sync Width (ms) 0.06 0.06 0.08 0.07 0.064 0.056 0.05 0.044 0.047 0.086 0.060 0.050
V. Back Porch (ms) 1.14 0.79 0.43 0.58 0.448 0.503 0.466 0.524 0.594 1.114 0.784 0.498
V. Active (ms) 12.71 15.25 12.8 11.09 12.8 11.17 12.79 11.18 16 13.714 12.549 12.749
Standard VGA VGA VESA VESA VESA VESA VESA VESA VESA MAC MAC MAC
6. Display Size
Horizontal: 310 mm +/-4mm
Vertical: 230 mm +/-4mm
7. Scanning Frequencies
Horizontal: 30KHz ~ 70KHz
Vertical: 50 Hz ~ 160 Hz
8. Factory Preset Timings: 12
User Timings: 20
9. Misconvergence
A Zone: 0.25 mm Max.
B Zone: 0.30 mm Max.
C Zone 0.35 mm Max
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10. Video Bandwidth: 120 MHz
11. Power Source:
Switching Mode Power Supply
AC 100 ~240V, 50/60Hz Universal Type
12. Operating Temperature: 0°C to 40°C Ambient
13. Humidity: 5% to 95% Relative, Non-Condensing
14. Weight: 15. Kgs(Net), 17.5Kgs(Gross)
Width: 410 mm
Height: 402 mm
Depth: 420mm
16. External Connection:
15 Pin D-sub Connector
AC Power Cord
17. Regulatiory/Safety
Regulatory Filing Regulatory filing should be made under the "Model Number-
XY"
Pacific Asia UL1950, c UL1950,FCC Part 15 Subpart J Subpart B, DHHS
Australia, Part 21 Subpart J X-Ray Protection, CSA 22.2/cUL950, ICES-
New Zealand, 003 Class B, CB, CE, MSMI, PSB, C-TICK, EPA Energy Star,
So. Africa VCC I
Europe UL1950, FCC Part 15 Subpart J Subpart B, DHHS Part 21
Subpart J X-Ray Protection, CSA 22.2/cUL950, ICES-003 Class
B, CB, EMC/CE, TUV/GS, NEMKO, SEMKO, DEMKO,
FIMKO, Gost-R, PCBC, SASO, Energy Star
15.2 International
CB, MPRII, CE
15.3 Power Management
Power Management Amendment to EnergyStar Version 2
MOU, dated
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OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the Color display.
1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-
wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and
cabinet to the electrical conduit ground. If the AC outlet in your location does not have provisions for the
grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws
on the connector to ensure firm grounding. The connector information is as follow:
1 5
6
10
11 15
15 - Pin Color Display Signal Cable
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1. RED 9. 5V From PC
2. GREEN 10. Sync GND
3. BLUE 11. NC
4. GND 12. SDA
5. GND 13. HORIZ. SYNC
6. GND-R 14. VERT. SYNC (¡¯VCLK)
7. GND-G 15. SCL (DDC CLOCK)
8. GND-B
3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty
seconds for display tube warm-up. The Power-On indicator lights when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness
and contrast to the most pleasing display.
5. This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable
to the PC.
6. If your color display requires service, it must be returned with the power cord.
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3. Front Panel Function Control Description
Adjusting the Screen Image
Use the buttons on the front control panel to display and adjust the OnView®
controls which display on the screen. The OnView controls are explained at the
top of the next page and are defined in "Main Menu Controls" on page 8.
Main Menu
With OnView controls
Front Control Panel
Displays Main Menu; also saves
changes/exits Main Menu Power Light Power On/Off
Displays control screen for
Scroll through menu highlighted control (or pair
options and adjust the of controls). Also, toggles
displayed control between pairs of controls on
some control screens
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OSD Lock Settings
You have the option of using the On Screen Display (OSD) locking feature,
OSD LOCK, to prevent unwanted changes to the current image settings.
· OSD Lock: Press and hold the [1] and [] buttons on the face of the monitor
for 10 seconds. The message "OSD LOCK" will then display briefly,
indicating that the OSD image settings are now locked.
· OSD Unlock: Press and hold the [1] and [] buttons again for 10 seconds. The
message "OSD UNLOCK" will then display briefly, indicating that the OSD
image settings are now unlocked.
Do the following to adjust the screen image:
1 To display the Main Menu, press button [1].
2 To select a control you want to adjust, press the arrow buttons on the front
control panel of your monitor and scroll through the choices. When the
control you want is highlighted, press button [2].
NOTE: Some controls on the Main Menu are listed in pairs, such as
Contrast/Brightness. Display control screen (sample shown in step 3 below).
Press button [2] to toggle to the next control in the pair.
3 To adjust the selected control, such as CONTRAST in the sample below,
press the arrow buttons.
BRIGHTNESS
4 To save the control setting and Exit the menu press button [1] twice.
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Main Menu Controls
Adjust the menu items shown below by using the up and down buttons.
Control Explanation
Contrast adjusts the difference between the image
background (black level) and the foreground (white level).
Brightness adjusts the background black level of the screen
image.
Zoom expands and contracts the entire screen image.
Horizontal Position moves the screen image left or right.
Horizontal Size adjusts width of the screen image.
Vertical Position moves the screen image up or down.
Vertical Size adjusts the height of the screen image.
Pincushion curves the vertical sides of the screen image.
Pin Balance curves the vertical edges of the screen image to
the left or right.
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.
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Control Explanation
Degauss removes the build-up of magnetic fields that can
cause irregular colors to appear around the edges of screen
images. There are two ways to degauss the display:
automatically by turning the monitor on, or manually by
selecting the Degauss control from the menu.
With Degauss selected from the menu, press button [2] to
degauss the monitor manually.
Important: Do not degauss repeatedly. Doing so can be
harmful to the display. Wait at least 20 minutes (before
selecting this control again.
ViewMatch® Color provides several color options: several
preset color temperatures and User Color which allows you
to adjust red (R), green (G), and blue (B). The factory
setting for this product is 9300K (9300°Kelvin).
9300K -- Adds blue to the screen image for cooler white
(used in most office settings with fluorescent lighting).
6500K -- Adds red to the screen image for warmer white
and richer red.
5000K -- Adds blue and green to the screen image for a
darker color.
User Color -- Individual adjustments for red, green, and
blue.
Moire reduces interference patterns that appear as ripples,
waves, or unwanted background color textures. Interference
patterns of this type are most noticeable when viewing
images having closely spaced lines or finely detailed
patterns.
Language allows you to choose from among several
languages for the menus and control screens: English,
French, German, Italian, and Spanish.
Memory Recall returns adjustments to the original factory
settings if the display is operating in a factory preset timing
mode listed in this user guide.
Exception: This control does not affect changes made with
the User Color control.
ViewMeter displays the frequencies (horizontal and
vertical) coming from the graphics card of the computer.
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4. Circuit Description
4-1 MICRO CONTROLLER CIRCUIT
MICRO Controller
The IC101 contains a 8031 8-bit CPU core, 60K bytes of RAM, 16K bytes of ROM,14 channel 8 bit PWM D/A
converters, 2 channel A/D converters for key detection,0.5sec watch-dog timer, internal H-sync and V-sync
signals processor providing mode detection, watch- dog timer preventing system from abnormal operation, and an
I²C bus interface.
H/V sync signals processor
The functions of the sync processor include polarity detection, H-SYNC & V-SYNC signals counting,
Programmable SYNC signals output, free running signal generator. Pin41/Pin42 are for the H-SYNC and V-
SYNC input, Pin34/Pin33 will output the same signal as input sync signal without delay, and the polarity are
setting in the positive. When no signal input, the Pin32 will output a 60Hz V-SYNC free run signal. The Pin33
will output a 48KHz H-SYNC free run signal. for the monitor testing use.
On Screen Display Controller
The IC801 is designed for display the built-in characters or fonts onto monitor screen. The display operation is by
transforming data and control information from micro controller to RAM through a serial data interface.
Pin2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R154,
C166, R155) and filter (R175, C167) is used to regulate the appropriate bias current for internal oscillator the
resonate at specific dot frequency.
Pin5 is input the horizontal fly back pulse, for PLL generator tracking.
Pin6 is left floating, I²C bus is enabled. Otherwise the SPI bus is enabled.
Pin7 the external data transfer through this pin to internal display registers and control registers
Pin8 the clock-input pin is used to synchronize the data transfer.
Pin10 is input the vertical flyback pulse for synchronizing the vertical position.
Pin12 is output a blanking signal to cut off external R.G.B signals of VGA while this chip is displaying characters
or windows.
Pin13, Pin14, Pin15 is used to output the OSD (B.G.R) video signal.
4-2 DEFLECTION CIRCUIT
The deflection circuit is achieved by a high performance and efficient solution IC 401 (TDA4841) for this
monitor. The concept is fully DC controllable and can be used in applications with a micro-controller solutions.
The TDA4841 provides sync. Processing with full auto sync. Capability, a flexible SMPS block and an extensive
set of geometry control facilities. Further the IC generates the drive waveforms for DC coupled vertical boosters
to the TDA4863.
Horizontal Oscillator
The oscillator is of the relaxation type and requires a capacitor of 1nF C403 at pin29.
PLL 1 Phase Detector
The phase detector is a standard one using switched current sources. It compares the middle of H-sync. with a
fixed point on the oscillator saw-tooth voltage. The PLL loop filter C401, C402, R409 is connected to Pin26.
PLL2 Phase Detector
The PLL2 detector thus compensates for the delay in the external H-deflection circuit by adjusting the phase of
the HDRV output pulses. The phase between H-flyback and H-sync can be controlled at pin30.
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X-ray Protection
The X-ray protection input pin2 provides a voltage detector with a precise threshold. If the voltage exceeds this
threshold for a certain time, an internal latch switches the whole IC into protection mode. In this mode several
pins are forced into defined states:
Pin6 (BDRV) is floating
Pin8 (HDRV) is floating
Pin12, 13 ( VOUT 12, 13) are floating
Vertical Oscillator
The vertical free running frequency is determined by the resistor C613 at pin24. Usually the free-running
frequency should be lower than the minimum trigger frequency.
4-3 TRANSISTOR & DIODE CIRCUIT
LOCATION CIRCUIT FUNCTION DESCRIPTION
D901 ~ D904 Bridge Rectifier for AC Source
D910 Clamp Diode for Snubber CKT
D918, D919 Rectifier for Output Voltage
D922 Rectifier for Output Voltage
D923 Rectifier for Output Voltage
D925 Rectifier for B+ Supply
Q901 MOS FET for Switching Power Control.
Q907, Q908 Use for Off-Mode to Cut-off 6.3V Supply Voltage
Q909, Q918 Use for Standy-By or Suspend Mode to Cut-off 12V Supply Voltage
Q912, Q920 Push-Pull Topology to Drive Q911
Q913 Degaussing Switcher Transistor
Q921 5V Regulator Transistor
Q701 Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block
Q402 HOR. Driver Transistor
Q426 Horizontal s correction control MOSFET
Q404, Q405 As Differential Amp. to Drive Q406
Q406 Transistor for H-Size Control
Q705 Brightness Control CKT
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5. Adjusting Procedure
5-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
1. Approximately 30 minutes should be allowed for warm up before proceeding.
2. Adjustments should be undertaken only on those necessary elements since most of them have been
carefully preset at the factory.
5-2 MAIN ADJUSTMENTS
NO. FUNCTION LOCATION DESIGNATION
1. 14V ADJ PCB - MAIN VR903
2. B + ADJ PCB - MAIN VR902
3. SCREEN ADJ FLY BACK TRANS T402 SCREEN VR
4. FOCUS ADJ FLY BACK TRANS T402 FOCUS
VR1&VR2
5. ABL ADJ PCB - MAIN AB in factory OSD
6. FUNCTION ADJ -MENU PCB - MAIN (SW101)
-UP PCB - MAIN (SW102)
-DOWN PCB - MAIN (SW103)
-EXIT PCB - MAIN (SW104)
5-3 ADJUSTMENT METHOD
1. 14V, B + & HV voltage adjustment:
A. Chroma-2000 Signal generator or PC equivalent set mode 1, VGA 640X480 pattern 1.0.
B. Connect a DC Volt meter between TP901 and ground, then adjust VR903to be 14VDC.
C. Connect a DC Volt meter between TP902 and ground, then adjust VR902 to be 65.5 VDC.
2. Factory preset Timings Adjustment:
A. Press Key to show OSD window press Up or Down Key to switch the functional controls.
B. Press the Up Key to select the "ZOOM" function, then press the MENU Key. While do not release the
MENU Key until the 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.
CONTRAST H-MOIRE REDUCE
BRIGHTNESS V-MOIRE REDUCE
H-CENTER R-GAIN
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H-SIZE G-GAIN
V-CENTER B-GAIN
V-SIZE R-BIAS
ZOOM G-BIAS
PINCUSHION R-BIAS
TRAPEZOID 9300 COLOR TEMPERATURE
PIN-BALANCE 6500 COLOR TEMPERATURE
PARALLELOGRAM 5500 COLOR TEMPERATURE
ROTATION OSD EXIT
LC V-LINEARITY RETURN
LS V-LINEARITY H-size Max range limit.
HP
AB ABL CORTROL Tm Operation time record.
TOP CORNER BURN IN
BI
BOTTOM CORNER DEGAUSS
D. To switches the input signal to the other Timing Mode. Please follow step A ~ C to get the optimum
picture.
E. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will
be returned to the original OSD window.(user's operating condition)
F. The setting data of the CONTRAST, BRIGHTNESS, PIN-BALANCE, PARALLELOGRAM,
ROTATION, COLOR TEMPERATURE are common mode saved in the memory. Don't needed adjust it
individual at every timing Mode and save in the memory.
3. White Balance, Luminance adjustment:
A. Bias (Low Luminance) adjustment:
(a) Set mode 1024*768 Fv: 85Hz full white pattern.
(b) To make the adjustment condition is under the Factory preset window.
Same as step 2-B.
(c) Warm up more than 20 minutes.
(d) Brightness set to maximum. Contrast set to maximum. full raster pattern,
(e) Fixup G-Bias(DAC=30) , adjust B-Bias , R-Bias , then adjust FBT screen VR
to make x= 283 ± 10, y= 298 ± 10 Y= 3.5+2cd/m² Brightness set to raster just cutoff(0.05cd/ m²),
to save to color temperature 9300k .
B. Gain (High light) adjustment:
(a) Set mode 1024*768 Fv: 85Hz 20% of default image pattern.
(b) Brightness set to raster just cutoff and set the contrast to max.
(c) Adjust G-Gain , B-Gain , R-Gain , to make color temperature x=283 ± 10,
y=298 ± 10. Y=155±10cd/m².
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C. The adjustment of 6500°K white Balance, May follow step A ~ B , with the x=313 ± 10, y=329 ±
10.Y=145±10cd/m²
D. Thr adjustment of 5000°K white Balance, May follow step A-B, with the x=346± 10, y=359 ± 10,
Y=135±10cd/m²
E. Full white luminance:
(a) Set mode1 1024*768 Fv: 85Hz full white pattern.
(b) Image Size : H:310±4mm V:230±4mm.
(c) Brightness set to raster just cut off and set the contrast to max.
(d) Adjust AB( ) to the luminance at 105± 10cd/m².
4. Focus Adjustment:
A. Set mode 1024×768 Fv: 85Hz with character full page.
B. Adjust brightness to center and contrast to max.
C. Then adjust focus VR1 to a fine vertical line.
D. Adjust focus VR2 to a fine horizontal line.
E. Repeat step C & D.
5. Purity Adjustment
A. Be sure that the display is not being exposed to any external magnetic fields.
B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is
29mm. (See below diagram)
C. Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to
obtain a complete field of the color red. This is done by moving the two tabs in such a manner that they
advance in an opposite direction but at the same time to obtain the same angle between the two tabs,
which should be approximately 180'.
D. Check the complete blue and complete green patterns to observe their respective color purity. Make minor
adjustments if needed.
RELATIVE PLACEMENT OF TYPICAL COMPONENTS
Purity Magnets
6-pole Convergence Magnets
4-pole Convergence Magnets
Deflection Yoke
6. Convergence adjustment
A. Produce a magenta crosshatch on the display.
B. Adjust the focus for the best overall focus on the display.
Also adjust the brightness to the desired condition.
C. Vertical red and blue lines are converged by varying the angle between the two tabs of the 4 pole magnets
on the PCM assembly. (See above diagrams)
D. Horizontal red and blue lines are converged by varying the two tabs together, keeping the angle between
them constant.
E. Produce a white crosshatch pattern on the display.
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.
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6. Trouble Shooting Flow Chart
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
CHECK MAIN PCB POWER
CHECK MAIN PCB POWER
SUPPLY 57.5V,14V,80V
53V, 14V, 80V
CHECK POWER SAVING
NG H-SYNC, V-SYNC
Q909,
OK
OK
CHECK THE HIGE VOLTAGE OF
CHECK
CRT ABOUTTHE HIGE
24.5~26.5KV
REFER ITEM S.M.P.S.
OF CRT ABOUT 25.5 ~
NG CHECK FAILSAFE CKT
OK
PIN 25 RELATIVE CKT.
CHECK THE VOLTAGE OF
HEATER ABOUT 6.3V
NG CHECK CRT'S HEATER
OK CIRCUIT Q907,
CHECK SCREEN VOLTAGE
400V TO 600V
LESS THAN 300V
CHECK FBT
OK
BRIGHTNESS SET TO MAX.
CHECK CRT G1 VOLTAGE
CHECK BRIGHTNESS CIRCUIT
NG CHECK BRIGHTNESS
Q705 RELATIVE CKT.
OK Q705 RELATIVE CKT.
CHECK VOLTAGE OF THE
CATHODE ABOUT 65V TO
NG REFER ITEM 6-2
"ABNORMAL
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1.ABNORMAL VIDEO LEVEL ON SCREEN
CHECK THE VOLTAGE OF IC801
PIN 10 ABOUT 5V
NG
CHECK 5V RELATIVE
OK
CHECK THE SIGNAL INPUT OF
ABOUT 0.7Vpp
CHECK SIGNAL CABLE
OK INTERFACE CARD.
CHECK IC801 PIN 23 CLAMP
NG CHECK THE IC801 PIN
OK RELATIVE CIRCUIT
CHECK THE VIDEO OUTPUT OF
PIN 19, 20, 21 ABOUT
CONTRAST SET
NG CHECK IC801 PIN 5/PIN 6/PIN 7 & PIN
OK RELATIVE CIRCUIT
R.G.B. APPROACH
2. ABNORMAL DDC (PLUG & PLAY)
CHECK IC101 PIN 5 VOLTAGE ABOUT 5V
CHECK IC101 PIN 5 VOLTAGE ABOUT
5V
NG
CHECK Q921 GOOD OR FAIL
OK
CHECK SIGNAL CABLE
OUTPUT
OR H802 PIN 2, 3 DATA OUTPUT
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6-2 ABNORMAL DISPLAY
1.NO SIGNAL ON SCREEN
CHECK VIDEO IC801 VCC ABOUT
NG CHECK THE 12V PIN
OK OF P802
CHECK THE OUTPUT VOLTAGE
OF IC801 PIN 19, 20, 21 AT
NG CHECK THE RELATIVE
OK OF IC801 PIN 10 Vcc CIRCUIT
CHECK THE B+ VOLTAGE OF
VIDEO PCB ABOUT
NG CHECK THE 80V RELATIVE
OK OF SMPS ON MAIN
CHECK THE VOLTAGE OF
CATHODE ABOUT
NG CHECK THE
OK RELATIVE CIRCUIT
CHECK THE VOLTAGE OF FBT
ABOUT 400V TO
LESS THAN 400V
CHECK FBT RELATIVE
EXCEED 700V
CHECK FBT & CRT RELATIVE
OR REFER ITEM
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6-3 NO BLANKING
CHECK THE
CIRCUIT OF
NG CHECK THE RELATIVE
OK OF Q601, Q707 Q705.
CHECK R859 ON VIDEO
CHECK G1 RELATIVE
FBT PIN 4 ON MAIN
6-4 HOR./OSC/DEF/HV CIRCUIT FAULT
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
CHECK IC401 PIN 10 ABOUT 12
NG
CHECK IC401 PIN 10 RELATIVE
OK
CHECK IC401 PIN 8 WAVE FORM
ABOUT 3Vpp
NG CHECK IC401 PIN 26~29,
OK RELATIVE CIRCUIT
CHECK THE COLLECTOR
OF Q402 ABOUT
NG CHECK Q402,
OK RELATIVE CIRCUIT
CHECK THE COLLECTOR
OF Q403 ABOUT 1200Vpp AT
CHECK
NG T401,T402,Q402,Q403,CD408,D408,
CHECK T401, T402, Q402,
C418,C419,H-DY,B+
D408, C418, C419, H-DY,
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6-5 ABNORMAL HORIZONTAL DEFLECTION
1. ABNORMAL HORIZONTAL WIDTH OF VIDEO
READJUST H -WIDTH
NG CHECK THE RELATIVE
OK OF Q404, Q405, &
CHECK FBT B+
ABOUT 65V AT
CHECK THE
CIRCUIT OF
CHECK THE HV
CRT ABOUT 25.5KV
24.5KV
2. ABNORMAL HORIZONTAL VIDEO CENTER
CHECK IC401 PIN 29
RELATIVE CIRCUIT
3. ABNORMAL HORIZONTAL LINEARITY
CHECK L401, Q426, Q428,Q431
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6-6 ABNORMAL VERTICAL SCANNING
1. ABNORMAL VERTICAL SIZE
READJUST V - SIZE FUNCTION
CHECK THE IC601 PIN 2 ABOUT 12V
PIN 4 ABOUT -12V
NG CHECK D601,
RELATIVE CIRCUIT
OK
CHECK VERT. OSC
NG
CHECK THE VOLTAGE OF
RELATIVE CIRCUIT
OK
NG
READJUST V-SIZE FUNCTION CHECK IC401 PIN 12, 13, 21, 22,24
RELATIVE CIRCUIT
2. VERTICAL CENTER
READJUST V-CENTER
NG CHECK IC401 AND IC601
RELATIVE CKT
6-7 SIDE-PIN CUSHION DISTORTION
READJUST SIDEPIN
NG CHECK IC401, Q404, Q405, Q406
RELATIVE CKT.
6-8 POOR FOCUS
READJUST FOCUS CONTROL
NG CHECK FOCUS CONTROL UNIT,
FOCUS LEAD WIRE, CRT SOCKET & CRT
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6-9 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 58. V - 14V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B) CONSTANT OUTPUT : 6.3V, 12V, -12V, 80V
BEAD SET ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
CHECK AC LINE
THE VARIABLE
VOLT 120V OR 220V
Output is not shorted
NG
CHECKF901, SW901
Check IC401 pin
OK 3,4,5,6,B+driver
CHECK LINE RECTIFIED
& SMOOTHED VOLT YES
CHECK THE 53V
NG CHECK BRIDGE
RECTIFIED CIRCUIT
OK
NG
CHECK D919
CHECK START C.K.T
R923 R924, D911, D917
R904, Q906
OK
CHECK Q911
OK NG
Q911 FAILURE
CHECK T901 O/P
OK
IC401,10(ABOUT 11.5V)
Check 78V, 59.5V, 14V NG
NG
CHECK Q901
6.3V, -12VCIRCUIT OUTPUT OK
OK
CHECK IC901
NG
IC901 FAILURE
OK
CHECK Q901
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7. Recommended Spare Parts List
E70-11 RSPL
Item ViewSonic P/N Reference P/N Description Location Universal number# Q'ty Lead time
1 B-MB-0201-2735 CMS773Z1NVO Main Bord (with component) 1 60
2 B-VB-0202-0357 CRS773Z1NVW Video Board (with component) 1 60
3 A-UG-0107-0498 41A6870913A QSG 1 10
4 A-CD-E70-11 70A7747091A CD Manual 1 10
5 E-IC-0401-2112 56A37912 POWER CONTROL IC IC901 UC3842 1 60
6 E-IC-0401-4017 56A1125-552-X OTP MCU IC101 NT68F63U 1 60
7 E-IC-0450-0039 56A1133-13 EEPROM IC102 24LC08 1 60
8 E-IC-0401-1880 56A5522 Horizontal Deflect IC IC401 TDA4841PS 1 60
9 E-IC-0401-4018 56A5841A Vertical Deflect IC IC601 TDA4863A/ 1 60
10 E-IC-0401-4019 56A366509 Video Preamplify IC IC801 LM1246DKA 1 60
11 E-IC-0401-4020 56A551524 Video Amplify IC IC802 LM2470TA 1 60
12 E-IC-0401-2060 56A5396 Video Bias Control IC IC803 LM2480NA 1 60
13 E-Q-0402-1457 57A7246 POWER MOSFET Q901 STP7NC70ZFP 1 60
14 E-Q-0402-1508 57A60027 B+ CONTROL MOSFET Q911 IRF634B 1 60
15 E-D-0403-1883 93A5255P52T AC Rectifier Diode D901~D904 1N5408 1 60
16 E-D-0403-1945 93A1060652T 100V Rectifier Diode D918 BYV26C 1 60
17 E-D-0403-1882 93A3040-8T 16V Rectifier Diode D922 RG-4 1 60
18 E-D-0403-1945 93A1060-6-52T B+ Rectufuer Diode D919 RG-4 1 60
19 E-D-0403-2800 93A1002-1P-52T DAMPER D405 1N5817 1 8weeks
20 E-Q-0402-7024 57A706505 HOUTPUT TRANSISTOR Q403 2SC5929 1 8weeks
21 E-Q-0402-0576 57A4151 H-Size Control Q406 TIP122/Fairchild 1 60
22 E-Q-0402-7029 57A60014 CS Mosfet Q426/Q428/Q431 CEPF630 1 60
23 E-T-0408-0523 79A167125LS H-Driver Transformer T401 1 30
24 E-FBT-0406-0629 79A763-B504 FBT T402 1 30
25 E-L-0407-1605 79A167-126-HA LINEARITY COIL T403 1 60
26 E-T-0408-0524 80AS763-1-NF Power Transformer T901 1 30
27 E-L-0407-1398 61A52-27-4G Deguass Resistor PR901 1 50
28 E-L-0407-1401 61A58-8T-L Start-up Resistor NR901 1 50
29 E-FS-0410-0117 84A7H-400-SL FUSE F901 1 50
30 E-CRT-0409-0476 750A5852-1AV CRT 1 60
31 A-PC-0106-0282 89A402L18NYH Power cord for E70-11P 1 4weeks
32 A-PC-0106-0195 89A412L18NIS Power cord for E70-11A 1 4weeks
33 A-PC-0106-0215 89A404L18NYH Power cord for E70-11E 1 4weeks
34 C-FP-0301-1023 34A799-AF0-A Bezel 1 2
35 C-BC-0302-0609 34A762-F0-1A Rear Cover 1 2
36 C-BS-0303-0538 34A741-F0-L Base 1 2
37 C-BS-0303-0539 34A740-F0-L Swivel 1 2
38 M-MS-0808-7479 23A31821 Bird Logo 1 20
39 P-FM-0602-0892 44A67B4-1 1 of 2 EPS Cushion 1
7
40 P-FM-0602-0893 44A67B4-2 2 of 2 1
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E70-11 BOM
Item ViewSonic P/N Reference P/N Description Location Q'ty Universal number#
1 #N/A 1A5035T47 SCREW FOR CRT 4
2 M-MS-0808-7415 5A388 RUBBER WASHER 4
3 M-MS-0808-7367 11A112500 WIRE MOUNT 1
4 #N/A 11A115500 FBT CLIP 1
5 #N/A 11A60331 PCB SUPPORT 2
6 M-MS-0808-7370 12A3851 RUBBER FOOT 0
7 M-MS-0808-7373 19A4037 STEEL 1
8 M-MS-0808-7374 19A5062 STEEL WIRE SPRING 0
9 M-MS-0808-7479 23A31821 Logo 1
10 M-MS-0808-7381 33A4020YA S.C.CAP 1
11 M-MS-0808-7383 33A41131 LENS 1
12 PL-NB-0707-0186 33A4114F0A POWER KNOB 1
13 M-MS-0808-8846 33A69111 CRT SUPPORT 1
14 PL-TB-0717-0109 34A740F0L SWIVEL 1
15 PL-PS-0715-0193 34A741F0L BASE 1
16 #N/A 34A762F01A BACK COVER 1
17 C-FP-0301-0887 34A799AF0A FRONT PANEL 1
18 #N/A 40A153171A CRT Warning Label 1
19 M-LB-0813-0611 40A1545011 HI-POT GND LABEL 1
20 #N/A 40A45760819A 1
21 M-LB-0813-0628 40A58126704 0
22 M-LB-0813-0615 40A58162410A H/V LABEL 1
23 M-LB-0813-0618 40A5817091A CARTON LABEL 1
24 #N/A 40A58170915A 3
25 #N/A 40A58170918D PALLET LABEL 0
26 #N/A 40A206870915A ID LABEL 1
27 M-MS-0808-7386 41A68508A 0
28 A-UG-0107-0498 41A6870913A QUICK SET UP GUIDE 1
29 M-MS-0808-7387 44A600045B 0
30 M-MS-0808-7388 44A600046B 0
31 #N/A 44A60027166A 0
32 #N/A 44A60027167A 0
33 #N/A 44A67547094A CARTON 1
34 #N/A 44A67B41 EPS 1
35 #N/A 44A67B42 EPS 1
36 #N/A 44A9003210 0
37 M-MS-0808-8312 45A7628V3 PE BAG FOR MANUAL 1
38 M-MS-0808-8313 45A7634RN PE BAG FOR BASE 0
39 M-MS-0808-7393 45A773 8
40 M-MS-0808-7394 45A77500 BARCODE RIBBON 9
41 M-MS-0808-7395 45A77501 BARCODE RIBBON 2
42 M-MS-0808-8315 45A887RN Monitor PE BAG 1
43 #N/A 45A8850032 PALLET PE BAG 0
44 #N/A 45A8850033 PALLET PE BAG 0
45 M-MS-0808-7396 49A511A 3
46 M-MS-0808-7397 50A45 0
47 M-MS-0808-7398 50A5001 9
48 #N/A 50A500500 CABLE TIE 1
49 M-MS-0808-7401 50A5022 PLASTIC TIE 2
50 M-MS-0808-7402 50A5025 CABLE TIE 1
51 #N/A 51A214 3
52 M-MS-0808-7405 51A64 SILICON 9
53 #N/A 51A5001 0
54 M-MS-0808-7406 52A1150C TAPE 5
55 M-MS-0808-7407 52A1185 MIDDLE TAPE FOR CARTON 8
56 M-MS-0808-7408 52A11851 BIG TAPE 0
57 M-MS-0808-7409 52A1186 SMALL TAPE 8
58 #N/A 52A1211502 AL TAPE 1
59 M-MS-0808-7411 52A2191A 4
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Item ViewSonic P/N Reference P/N Description Location Q'ty Universal number#
60 #N/A 52A60166501 2
61 #N/A 52A60171 0
62 M-MS-0808-7413 55A1005 9
63 M-MS-0808-7414 55A2001 1
64 A-CD-E70-11 70A7747091A CD MANUAL 1
65 #N/A 85A6020500 GROUNDED PLATE 2
66 #N/A 85A60271 Shield Case 1
67 #N/A 85A6028500 SHIELD CASE 1
68 A-PC-0106-0287 89A404L18NIS POWER CORD 1
69 A-PC-0106-0215 89A404L18NYH POWER CORD 0
70 #N/A 95A91205646 1
71 #N/A 95A205T3005A WIRE AS1 1
72 #N/A 95A2070521 COPPER BRAID 1
73 M-SCW-0824-0610 B1A103510128 SCREW 3.5X10 1
74 M-SCW-0824-0612 D1A11407128 SCREW 4X7(FOR AC)