ViewSonic E70-3 User manual

VIDE-V26045
Service
Manual
ViewSonic
E70-3
Model
No.
VCDTS21569-3
17”
pigitat
Controlled
Color
Monitor
E*
Series
ev. 1— March 2000
ViewSonic®
381
Brea
Canyon
Road,
Walnut,
California
91789
USA
-
(800)
888-8583

Copyright
Copyright © 1998 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
Description
Of
Changes
Approval
3/10/00
_|
Initial
Issue
T.
Sears
ii E70-3 Service Manual

Copyright
Copyright © 1998 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
Description
Of
Changes
Approval
3/10/00
_|
Initial
Issue
T.
Sears
ii E70-3 Service Manual

TABLE OF CONTENTS
T-
PRECAUTIONS:
AND
SAFETY
NOTICES.
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REQUIRED.
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PINELECT
RICA
PARTS
LIST
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E70-3
Service
Mangal

E70-3 Service Manual
1. PRECAUTION AND NOTICES
1.1. SAFETY PRECAUTIONS
1.
2.
Observe all caution and safety related notes located inside the display cabinet.
Operation of the display with the cover removed, may cause a serious, shock hazard from the
display power supply. Work on the display should not be attempted by anyone who is not
thoroughly familiar with the necessary precautions when working on high voltage equipment.
.
Do
not
install,
remove
or
handle
the
picture
tube
in
any
manner
unless
shatter-proof
goggles
are worn. people who are not so equipped should be kept away while handling picture tube.
Keep picture tube away from the body while handling.
.
The
picture
tube
is
constructed
to
limit
X-RAY
radiation
to
0.5
mR/HR.
For
continued
protection, use the designated replacement tube only, and adjust the voltages so that the
designated maximum rating at the anode will not be exceeded.
.
Before
returning
a
serviced
display
to
the
customer,
a
thorough
safety
test
must
be
performed
to
verify
that
the
display
is
safe
to
operate
without
danger
or
shock.
Always
perform
an
AC
leakage
current
check
on
the
exposed
metallic
parts
of
the
cabinet,
such
as
screw
heads.
Test
method
for
current
leakage
is
described
as
follow.
(a)
Plug
the
AC
line
cord
directly
into
rated
AC
outlet
(do
not
use
a
line
isolation
transformer
during
this
check).
(b)
Use
an
AC
voltmeter
having
5000
ohms
per
volt
or
with
more
sensitivity
in
the
following
manner:
Connect
a
1500
ohms
10
Watt
resistor,
paralleled
by
a
0.15mfd,AC
type
capacitor
between
a
known
good
earth
ground
(water
pipe,
conduit,
etc.)
and
the
exposed
metallic
parts
simultaneously.
Measure
the
AC
voltage
across
the
combination
of
1500
ohms
resistor
and
0.15mfd
capacitor.
(c)
Reverse
the
AC
plug
at
the
AC
outlet
and
repeat
AC
voltage
measurements
for
each
exposed
metallic
part.
(d)
Voltage
measured
must
not
exceed
2.8
volts
RMS.
This
corresponds
to
2
milliamp
AC.
Any
value
exceeding
this
limit
constitutes
a
potential
shock
hazard
and
must
be
corrected
immediately.
1.2. PRODUCT SAFETY NOTICE
Many
electrical
and
mechanical
parts
in
this
chassis
have
special
safety
visual
inspections
and
the
protection
afforded
by
them
cannot
necessarily
be
obtained
by
using
replacement
components
rated
for
higher
voltages,
wattage,
etc.
Before
replacing
any
of
these
components
read
the
parts
list
in
this
manual
carefully.
The
use
of
substitute
replacement
parts
which
do
not
have
the
same
safety
characteristics
as
specified
in
the
parts
list
may
create
shock,
fire,
X-RAY
radiation
or
other
hazards.
SS
epee
ViewSonic
Corporation
Je
1/17/2000

E70-3 Service Manual
1.3. SERVICE NOTES
1.
When
replacing
parts
or
circuit
boards,
clamp
the
lead
wires
around
terminals
before
soldering.
;
2.
When
replacing
a
high
wattage
resistor
(more
than
1W
of
metal
oxide
film
resistor)
in
circuit
board,
keep
the
resistor
about
5mm
away
from
circuit
board.
3.
Keep
wires
away
from
high
voltage,
high
temperature
components
and
sharp
edges.
4.
Keep
wires
in
their
original
position
so
as
to
reduce
interference.
5.
Usage
of
this
product
please
refer
to
also
user's
manual.
1.4. HIGH VOLTAGE WARNING
Operation
of
monitor
outside
of
cabinet
or
with
back
removed
may
cause
a
serious
shock
hazard.
Work
on
these
models
should
only
be
performed
by
those
who
are
thoroughly
familiar
with
precautions
necessary
when
working
on
high
voltage
equipment.
Exercise
care
when
servicing
this
chassis
with
power
applied.
Many
B
plus
and
high
voltage
terminals
are
exposed
which,
if
carelessly
contacted,
can
cause
serious
shock
or
result
in
damage
to
the
chassis.
Maintain
interconnection
ground
lead
connections
between
chassis
and
picture
tube
dag
when
operating
chassis.
Certain
HV
failures
can
increase
X-ray
radiation.
Monitor
should
not
be
operated
with
HV
levels
exceeding
the
specified
rating
for
the
chassis
type.
The
maximum
operating
HV
specified
for
the
chassis
used
in
this
monitor
is
25.5KV+t I1KV
with
a
line
voltage
of
120/240V
AC.
Higher
voltage
may
also
increase
possibility
of
failure
in
HV
Supply.
It
is
important
to
maintain
specified
values
of
all
components
in
the
horizontal
and
high
voltage
circuits
and
anywhere
else
in
the
monitor
that
could
cause
a
rise
in
high
voltage
or
operating
supply
voltages.
No
changes
should
be
made
to
the
original
design
of
the
monitor.
Components
shown
in
the
shaded
areas
on
the
schematic
should
be
replaced
with
exact
factory
replacement
parts.
The
use
of
unauthorized
substitute
parts
may
create
a
shock,
fire
or
other
hazard.
To
determine
the
presence
of
high
voltage,
use
an
accurate,
high
impedance,
HV
meter
connected
between
second
anode
lead
and
CRT
dag
grounding
device.
When
servicing
the
High
Voltage
System,
remove
static
charge
from
it
by
connecting
a
10K
ohm
resistor
in
series
with
an
insulated
wire(such
as
a
test
probe)
between
picture
tube
dag
and
2nd
anode
lead.
(AC
line
cord
disconnected
from
AC
power
outlet).
The
picture
tube
used
in
this
monitor
employs
integral
implosion
protection.
Replace
with
tube
of
the
same
type
number
for
continued
safety.
Do
not
lift
picture
tube
by
the
neck.
Handle
the
picture
tube
only
after
discharging
the
high
voltage
completely.
LR
-2-
1/17/2000
fiewSonic
Corporation
:
Confidential
-
Do
Not
Copy

E70-3 Service Manual
2. SERVICE TOOL & EQUIPMENT REQUIRED
1. MULTIMETER
2. OSCILLOSCOPE
3. SCREW DRIVER
4. IRON
5. ABSORBER
6. SOLDER
3. SPECIFICATIONS
3.1. PRODUCT SPECIFICATIONS
CRT: Size:
Viewable Size:
Dot Pitch:
Deflection:
DISPLAY: Size:
Diagonal Size:
Color:
Resolution:
Pixel Rate:
INPUT SIGNAL: Video Signal:
Sync. Signal:
Scanning Freq.:
POWER SOURCE: Power Supply:
Power Consumption:
POWER MANAGEMENT
17 Inch Diagonal Flat Square Type
15.6 Inch (Diagonal)
0.27/0.25 (Optional!)
90° Degree
300mm x 225mm
398mm
Unlimited Colors
Up to 1280 x 1024
110MHz
RGB Analogue 0.7Vpp 75 Ohms
H/V. Separated, TTL.
Level Positive or Negative.
30 KHz to 70 KHz for Horizontal
50 Hz to 120 Hz for Vertical
AC 100-240V, 60Hz/50Hz.
100W Max.
The Power Management states are controlled by the presence and/or absence of horizontal and
vertical sync signals according to the following:
STATE H. Sync V. Sync Power (normal) LED
100WATTS GREEN
ISWATTS ORANGE
ISWATTS ORANGE
3WATTS ORANGE
ON ON ON
STANDBY OFF ON
SUSPEND ON OFF
OFF OFF OFF
ip
-3- 1/17/2000
Confidential - Do Not Copy
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‘iewSonic Corporation

E70-3 Service Manual
3.2. FACTORY PRESET MODE TIMING CHART
UNIT
|
ESA
|
VGA
|
VESA_
|
VESA_
|
VESA
|__|
Resolution
|
1024x768
|
640x400
|
640x480
|
640x480
|
800x600
|_|
MHz
Fe
Syne
PO
aA
ors
ep
ee
eee
ed
WeSyne.
Poletity/<-=
te
Horizontal
Period
Horizontal
Syne
Width
2.032
1.556
|
1.616
|
usec
|
jas] ° =e N ° 3
=
is
wo
) Q yr av) ° a Q =
Ee
ee
ale
ay
(FRR
(ane
eres
eae
See)
75.000
Vertical
Sync
Width
|
0.050
[|
0.064
|
0.080
[|
0.069
|
0.064
|
msec
|
|
0.466
|
1.112
|
0.427
|
0.578
|
0.448
|
msec
|
|
12.795
|
12.711
|
12.800
[11.093
|
12.800
|
msec
|
msec
nterlaced
NO
No
|
Vertical
Period
13.328
14.268
13.333 11.764
13.333
msec
a I<I<i<
oO |;|e fo ea reaina Qiaiao
She
ie?) w
Sates
s.190
Bla |~
gy |® [ro e|<|s ie}
S |S |
°
|
MODE NO 6 8 ee |
|
VESA_|
VESA_
|
VESA_[
VESA_|
MAC
|__|
800x600
|
1024x768
|
1024x768
|1280x1024|
640x480
|_|
H.
Sync
Polari
pe
at
SO
lh
ek
V.
Sync.
Polari
pe
ee
ee
ee
ee
] ca.)
wn 2
[=] S.
fo} 3
63.981 | 35.00
Horizontal Period
Horizontal
Sync
Width
|
1.138__|
2.092
|
1.016
[1.037
[2.116
[usec
|
|_2.702
|
2.462
|
2.201
|
2.296
|
3.174
[usec
_|
fen] fea) jes)
o}1o Co fet. ef NIN N
o1o °
Bis 3 eiec oo
EA EES ES
> lw ie?) ome a o./2. O
<
@ |rg &
SIS |e] (8 Oley °
i 14.222 10.836
Horizontal Front Porch__| =
poszonal
Font
Porch
0.565
1.369
_}_oso8
{
aatd
{2.16
fuse
SERET
=
Vertical
Sync
Width
msec
|
0.503
|
0.599
|
0.524
|
0.594
msec
|
11.179
|
15.880
|
11.183
[716.005
|
13.714
|
msec
|
msec
nterlaced
No_
|
No
|
no
[Noy
No
Tf
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12 18
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|
————
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1/17/2000
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E70-3 Service Manual
[_"MODENO| 112] SYS—S NT
Ree ee MAC MAG ee ep
Resolution | 832x624 [ 1024x768] sd
Pixel | 37.283 | 80.000 | +| «| Sd ia |
ee ered
Ea ee aS
IV Syn Polanity\ = lft ea
Horizontal Frequency _—| 49.725 | 60.241 | | KH
Horizontal Period | 20.111 | 16.6 | Tec
Horizontal Syne Width | N17 J. see
Horizontal Back Porch —|_ 3.910 | 2.2 | TT usec
Horizontal Active Video | 14.525 | 128 | | TT usec |
Horizontal Front Porch | 0.559 | 04 | TT sec
ee ee Se
Vertical Frequency | 74.534 | 74.927 | TT
Vertical Period S| 13.414 | 13.346 [TT msec |
Vertical Syne Width | 0.060 | 0.05 | Tse |
Vertical Back Porch | 0.784 | 0.498 fT sec |
Vertical Active Video | 12.549 | 12.749 [Tse |
ferdeal Front Porch 002 {0.05 _{ __}___|__T msec |
Interlaced as Se a a
3
3.3. D-SUB CONNECTOR
D-SUB 15 PIN CONNECTOR
1.R 6.GND 11.GND
f A 2.G 7.GND 12.SDA
Sige e. 8 3.B 8.GND 13.H.SYNC
°
41° 120«13« 4415
° ° ° ° °
4.GND 9.NC 14.V.SYNC
5.NC 10.GND 15.SCL
SIGNAL LEVEL
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1/17/2000
MAIN PCB ASS'Y
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ULTLELELS
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(E70-3)
4.1. EXPLODED VIEW
ViewSonic
Corporation
.
:
Confidential
-
Do
N¢
Copy
:

E70-3 Service Manual
4.2. EXPLODED VIEW PARTS LIST
| Ref. No. Source] Part No
LL
er
veeeespsnnewen
2603200070
260320007)
2024256602
2080205400
2061450300
2080000500
2044255002
2046254502
2105150200
2053256200
2074156801
2084740102
2074153400
2074157300
2074156501
2063450600
2022254602
2084740202
2074191600
2090105043
2071650700
2072255000
2084730102
2074152600
2061250300
2072252002
2084730102
2080000200
2105250100
2071952200
2080000200
2087230102
2080000200
2072251300
2084730102
2072253901
2084730102
2072214600
2084730102
2071952900
2084730102
2074150900
DESCRIPTION
STAND ASSY
STAND ASSY
PANEL
SCREW,SPE T+
BUSHING
SCREW,SPE
FUNCTION KEY
PUSH BUTTON
SPRING
INDICATOR
HOLDER
SCREW,BND T+
HOLDER
HOLDER
HOLDER
ADHESI SHEET
CABI BACK
SCREW,BND T+
HOLDER
WASHER.METAL
SHIELD PLATE
HEAT SINK
SCREW,BND T+
HOLDER
SPONGE
HEAT SINK
SCREW,BND T+
SCREW,SPE
SPRING PLATE
METAL FITTG
SCREW,SPE
SCREW,B SPW+
SCREW,SPE
HEAT SINK
SCREW,BND T+
HEAT SINK
SCREW,BND T+
HEAT SINK
SCREW,BND T+
METAL FITTG
SCREW,BND T+
HOLDER
SPECIFICATION
JD177S3 HIPS94HB V.S.C COLOR
JD17783 V.S.C COLOR
JD177S V.S E70 ABS94V0 GY7521
JD157N 5X30L WASHER D=1!8
y 20X ~ 6.0X 3.0t
IC SCREW M3X12
JD177S ABS94V0 GY7521
JD177S ABS94V0 GY7521
y 0.5
JD177S POWER LED P3 PMMA 94HB
JD177S (PCB) ABS94V0 G7258
(ASA)/(B)\(SEA)(E)
JD177S SPACER HOLDER NYLON
JD177S (POWER) ABS94V0 G7258
200X15mm t=1.0 PVC 94V0
JD1778 ABS94V0 GY7521
M4X20(BND T+)
12865 <101> PP HB
20X5.5D 0.5T
SPTE T=0.3
JD199A A1100P t=2mm
JD145K 50X80X35t Pu FOAM94HF-1
A1100P+SPTE
M3X10(BND T+)
JD156H 2082640102+2092440200
SUS301 0.35t
3D177G SECC Imm
JD156H 2082640102+2092440200
3X10(T+) SWRM-3 ZMC2-C
JD156H 2082640102+2092440200
A60635-TS
M3X10(BND T+)
JD177P2 53900/UPDATE/C-NICKEL
JD199A SECC t=1.0mm
M3X10(BND T+)
NYLON 66
-7- 1/17/2000
ViewSonic Corporation

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Confidential - Do Not Copy :

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1/17/2000
Confidential - Do Not Copy
ViewSonic Corporation
VIDE-V26045 / Druck 1

8.2. MAIN & CRT PCB BOTTOM VIEW
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1/17/2000 -13-
ViewSonic Corporation
VIDE-V26045/ Druck 2

E70-3 Service Manual
9. TROUBLE SHOOTING FLOW CHART
NO RASTER
9-1,
POWER SUPPLY
UNIT
ITEM 9-10 OK
FILAMENT
LT
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NO LIT OR
CRT FAILURE
TURN THE SCREEN
VR TO RIGHT
CHECK SCREEN(G2)
VOLTAGE
RANGE: 450~700V
-
1.62
WIRE
TO
VIDEO
PCB DISCONNECT
TOOuew 2.FBT T403 FAILURE
3.CRT FAI
ae CRT FAILURE
VIDEO B*
SHALL BE 75V
-14- 1/17/2000
ViewSonic Corporation
CHECK
CHECK C424
Br
NO
CHECK H.V
OPERATION
CHECK
CRT FILAMENT
VOLTAGE 6.3V
SHALL BE 65V
AT 31KHz MODE
CHECK H.OSC
H.DEF
HV CIRCUIT
SEE ITEM 9-5
Confidential - Do Not Copy ‘
a

E70-3 Service Manual
9-2. ABNORMAL VIDEO CRT SCREEN
MEASURE R.G.B VIDEO OUTPUT
AT PIN 2,5,7 ON CRT SOCKET
v901
NO
OK CHECK B+ 75V
CHECK
POWER
SUPPLY
UNIT
ITEM 9-10
NO
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VR CLOCK WISE ae Suge
IC904
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PRE-AMP
IC901
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PINS CLAMP
CHECK SCREEN
VOLTAGE RANGE
450~700V
CHECK IC901
PIN 24 DC
RANGE
1~6V
(1).G2
WIRE
TO
VIDEO
Ter
PCB DISCONNECT
(2).FBT T402 FAILURE TOO LOW Tada
(3).CRT FAILURE
CHECK
VO CABLE
INPUT
—_—_—
-15-
1/17/2000
ViewSonic
Corporation
:
Confidential
-
Do
Not
Copy
: