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ViewSonic VG181 - Page 24

ViewSonic VG181
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Service
Manual
ViewSonic
VG181
July
2000
-
Version
1.0
THEORY
OF
CIRCUIT
OPERATION
PIN
DESCRIPTION
OF
U33
:
Even
pixel
(first
pixel)
bus
of
Red
bit
1
Even
pixel
(first
pixel)
bus
of
Red
bit
7
Even
pixel
(first
pixel)
bus
of
Green
bit
2
Ground
of
TTL
input
Even
pixel
(first
pixel)
bus
of
Green
bit
3
Even
pixel
(first
pixel)
bus
of
Green
bit
4
LTXINIO
TXIN10
Even
pixel
(first
pixel)
bus
of
Green
bit
0
Power
of
TTL
input
Even
pixel
(first
pixel)
bus
of
Green
bit
1
Even
pixel
(first
pixel)
bus
of
Green
bit
5
TXIN13
Even
pixel
(first
pixel)
bus
of
Green
bit
6
PGND
|
|
Ground
of
TTL
input
TXIN14
|
1
_|
Even
pixel
(first
pixel)
bus
of
Green
bit
7
TXIN15
Even
pixel
(first
pixel)
bus
of
blue
bit
2
TXIN16
Even
pixel
(first
pixel)
bus
of
blue
bit
0
7
eae
aie
ae
ptxiniz
|
jTinis
|
ot
|Txinio
ss
||
—st_|
Even
pixel
(first
pixel)
bus
of
blue
bit
4
'GnD-
os]
Ground
of
TTL
input
Vec
TXIN11
TXIN12
=
oO
7
10
11
12
13
14
15
16
Edge
select
for
latching
data
Even
pixel
(first
pixel)
bus
of
blue
bit
1
Even
pixel
(first
pixel)
bus
of
biue
bit
3
17
18
20
21
22
TXIN20
Even
pixel
(first
pixel)
bus
of
blue
bit
5
TXIN21
Even
pixel
(first
pixel)
bus
of
blue
bit
6
Even
pixel
(first
pixel)
bus
of
biue
bit
7
Unused
Power
of
TTL
input
TXI24N
TXIN25
ive)
“J
H-Sync
for
panel
V-Sync
for
panel
Ground
of
TTL
input
Data
Enable
for
panel
iw)
©
TXIN26
Page
22
Confidential
-
Do
Not
Copy

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