ViewSonic VP150M Service Manual - Page 17

ViewSonic VP150M - 15" LCD Monitor Manual

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Service Manual VP150m THEORY OF CIRCUIT OPERATION ViewSonic • September 2000 - Version 1.0 IC26 242021 45 NC NOD • = .17C YOLK NC 902 • VSS 9 A 600 D12 1114149 R77 G96 227 CL 4500 V70 I 1N R69 R150 070 OK DO] BA D.I x5 0 VS.0 07 076 1 C97 4140 7750 I 477 ,D.C) 221 e© "Al AD"c) "" 8109 B.0 72 B ad AV99 NOR -4 - NC 004 I 008 I2V 2.131 VI.001 0040 GPM R81 VLCD VIS Leo eue BO* -- o 1116 N.0 064 LOT ti'" 380: 160 002 • L20.L21.1.221122.201208.0030A.N1 7411Cuu5 I CDT 27 a t COe IC49 7411014 041 a908 71 1495 R60 'OK R, 9K0 000 554 51104 780 056 1K C01 RS1 22u tOK 4 1ev -4 COS L11219 1009 LMS1N R198 looK + 004 00K cis IC'S ]42014 741812 4700P ICI] 181 el 74110119 014 148 741810 R88 470 la 015 IC17 745086 Rat ..vx ± 2107 I This product uses 74HC4052 as a signal switch in order to support composite SYNC and SYNC on Green timings. The MPU (IC25) in this product provides the differential function to the Composite SYNC, so the SYNC processor circuit is simplified. The free run function in this product also make user to easily know the input signal is out of product specification or interrupted. When separated SYNC is detected through the V-in and H-in, MPU will set both the H-select and V-select will be XO, YO and MPU select digital interface will set IC06 X1, Y1 and MPU select SYNC on Green H-Sync set to X2, V-Sync set to Y2, when composite is select X3, Y3. V-com is the vertical SYNC separated from the Composite SYNC through MPU. The IC05 (LM319) extracts H-Sync from Green. Page 16 Confidential - Do Not Copy

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Service
Manual
VP150m
ViewSonic
•
September
2000
-
Version
1.0
THEORY
OF
CIRCUIT
OPERATION
CL
IC26
242021
45
NC
NOD
•=
.17C
YOLK
NC
902
•
VSS
9
A
V70
4500
I
1
N
R69
R150
OK
070
DO]
BA
600
D.
I
27
I
CDT
a
t
COe
IC49
7411014
71
R60
'OK
04
1
a908
1495
D12
1114149
R77
G96
227
x5
0
VS
.0
"Al
07
,D.
C)
221
e©
AD"c)
""
8109
B.0
004
I
008
I2V
2.131
VI.001
0040
GPM
R81
VLCD
LOT
72
B
ad
076
1
C97
4140
7750
I
477
AV99
NOR
-
4
-
NC
BO*
VIS
1116
Leo
N.0
eue
o
064
ti'"
380:
002
160
•
L20.L21.1.221122.201208.0030A.N1
7411Cuu5
cis
IC'S
]42014
741812
,
R
9K
0
C01
RS1
22u
tOK
4
1ev
-
4
000
554
51104
4700P
ICI]
1
8
1
e
l
74110119
R198
looK
COS
L11219
00K
1009
LMS1N
+
004
780
056
1K
014
R88
470
la
015
148
741810
IC17
745086
Rat
..vx
±
2107
I
This
product
uses
74HC4052
as
a
signal
switch
in
order
to
support
composite
SYNC
and
SYNC
on
Green
timings.
The
MPU
(IC25)
in
this
product
provides
the
differential
function
to
the
Composite
SYNC,
so
the
SYNC
processor
circuit
is
simplified.
The
free
run
function
in
this
product
also
make
user
to
easily
know
the
input
signal
is
out
of
product
specification
or
interrupted.
When
separated
SYNC
is
detected
through
the
V
-in
and
H
-in,
MPU
will
set
both
the
H
-select
and
V
-select
will
be
XO,
YO
and
MPU
select
digital
interface
will
set
IC06
X1,
Y1
and
MPU
select
SYNC
on
Green
H
-Sync
set
to
X2,
V
-Sync
set
to
Y2,
when
composite
is
select
X3,
Y3.
V-com
is
the
vertical
SYNC
separated
from
the
Composite
SYNC
through
MPU.
The
IC05
(LM319)
extracts
H
-Sync
from
Green.
Page
16
Confidential
—
Do
Not
Copy