ViewSonic VG150B Service Manual - Page 29

ViewSonic VG150B - 15" LCD Monitor Manual

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Service Manual VG150 THEORY OF CIRCUIT OPERATION ViewSonic April 1999 - Version 1.0 PIN# 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Name D12/P2.5 D11/p2.6 D10/P2.7 STOUT/P4.2 D9 D8 D7 D6 D5 D4 D3 D2 D1 DO VDD TYPE Description I "1" key I `-" key I "2" key - N.C. O LED 2 O LED 1 O Video offset control - Reserve O External H-Sync cutoff control O Video gain control O Sync on green /separate or composite select O V-Sync select (VBK/external V-Sync) O Free run mode enable O Power of inverter on/off control - Positive Power Supply Page 26

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Service
Manual
VG150
ViewSonic
April
1999
-
Version
1.0
THEORY
OF
CIRCUIT
OPERATION
PIN#
Name
TYPE
Description
26
D12/P2.5
I
"1"
key
27
D11/p2.6
I
`-"
key
28
D10/P2.7
I
"2"
key
29
STOUT/P4.2
-
N.C.
30
D9
O
LED
2
31
D8
O
LED
1
32
D7
O
Video
offset
control
33
D6
-
Reserve
34
D5
O
External
H
-Sync
cutoff
control
35
D4
O
Video
gain
control
36
D3
O
Sync
on
green
/separate
or
composite
select
37
D2
O
V
-Sync
select
(VBK/external
V
-Sync)
38
D1
O
Free
run
mode
enable
39
DO
O
Power
of
inverter
on/off
control
40
VDD
-
Positive
Power
Supply
Page
26