ViewSonic VP150M Service Manual - Page 41

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Service Manual VP150m THEORY OF CIRCUIT OPERATION ViewSonic September 2000 - 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 HN SYNC Processing TYPE I I I 0 O O O O O O O O O - Description "1" key `.." key "2" key N.C. Volum Control LED 1 N.C. Select Analog/Digital N.C. N.C. Sync on green /separate or composite select V-Sync select (VBK/external V-Sync) Free run mode enable Power of inverter on/off control Positive Power Supply VSYNC HSYNC Digital Filter Present Check Vpre Frequency Count Vfreq la -- --Vself Polarity Vpol Check Hi9li Frequency Mask VBLANK Hself CVSYNC Polarity Check & Sync Seperator Hpol Present Check CVpre I ID►HBLANK Digital Filter Hpre Present Check & Sync Seperator Hfreq Page 40 Confidential - Do Not Copy

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Service
Manual
VP150m
ViewSonic
September
2000
-
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
0
Volum
Control
31
D8
O
LED
1
32
D7
O
N.C.
33
D6
O
Select
Analog/Digital
34
D5
O
N.C.
35
D4
O
N.C.
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
HN
SYNC
Processing
Present
Vpre
Check
Digital
Filter
Vfreq
Frequency
Count
Vpol
Polarity
VSYNC
Check
la
Hi9li
VBLANK
----
Vself
Frequency
Mask
HSYNC
Hself
CVSYNC
Polarity
Check
&
Sync
Seperator
Hpol
Present
Check
Digital
Filter
Present
Check
&
Sync
Seperator
CVpre
I
ID►HBLANK
Hpre
Hfreq
Page
40
Confidential
—
Do
Not
Copy