ViewSonic VP150M Service Manual - Page 54
Trouble, Shooting, Converter
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ViewSonic September 2000 - Version 1.0 TROUBLE SHOOTING TROUBLE WITH DC-DC CONVERTER Start Service Manual VP150m IC18 pin1 correct ? IC30 pint correct? +5Vx voltage correct ? The voltage is about +12V t. Check power adaptor 2. Check power cable 3. Check Fl The voltage is about +12V while N power switch on 1. W04 to keyboard connected good? 2. Check W03 have work ? The voltage is about +4.9V N 1. Check IC20 output 1 2. Check L33 frequnce 3. Check IC22 4. Check ZDO4 VLCD correct ? N The voltage is about +4.9V 11, 1. Check R40, 1019, IC22 2. Check L34 frequency 3.3 correct ? END 1. Check 1008 (for IC01 power) 2. Check IC33, Q20 (for ICO2 power) 3. Check D15, D16, Q10 (for IC11 power) Confidential - Do Not Copy Page 53
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ViewSonic
September
2000
-
Version
1.0
Service
Manual
VP150m
TROUBLE
SHOOTING
TROUBLE
WITH
DC
-DC
CONVERTER
Start
IC18
pin1
correct
?
IC30
pint
correct?
N
The
voltage
is
about
+12V
t.
Check
power
adaptor
2.
Check
power
cable
3.
Check
Fl
The
voltage
is
about
+12V
while
power
switch
on
1.
W04
to
keyboard
connected
good?
2.
Check
W03
have
work
?
N
The
voltage
is
about
+4.9V
1.
Check
IC20
output
+5Vx
voltage
correct
?
2.
Check
L33
frequnce
1
3.
Check
IC22
4.
Check
ZDO4
VLCD
correct
?
N
The
voltage
is
about
+4.9V
1.
Check
R40,
1019,
IC22
11
,
2.
Check
L34
frequency
3.3
correct
?
END
1.
Check
1008
(for
IC01
power)
2.
Check
IC33,
Q20
(for
ICO2
power)
3.
Check
D15,
D16,
Q10
(for
IC11
power)
Confidential
—
Do
Not
Copy
Page
53