ViewSonic VP150M Service Manual - Page 53

ViewSonic VP150M - 15" LCD Monitor Manual

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Service Manual VP150m TROUBLE SHOOTING POOR IMAGE QUALITY I Start Image size OK ? II means image exced or less than display area 1. Is scaling in fill all 2. Do auto sync function will full pr. screen pattern 3. Is the timing supported 4. Check IC11 it digital 5. Check IC01 it analog S. Check power of 3.3V If analog 7. Check ripple (DC-AC) Vertical Stripe ? 1. Do auto tune function with lull screen pattern) 2. Is the timing supported 310 3. Adjust H-Size if analog 4. Check IC01 if analog! 5. Check power of 3.3V If analog 8. Check ripple (DC-AC) Position Shift ? Y 1. Do autosync function will full screen patternl 2. Is the timing supported 3. Adjust FIN-Position If analog Horizontal Stripe ? 1. Do autosync function will full screen patteml )1. 2. Is the timing supported 3. Adjust His-Position if analog 4. Check power of 3.3V if analog 5. Check ripple (DC-DC) Too dark or light ? 1. Adjust contrast & brightness 2. Adjust color 3. Adjust user R, G, B 4. Check backlight (inverter) 5. Check signal between IC23 and VEE 6. Calibrate ADC with pattern that 32 scales of gray if analog ViewSonic September 2000 - Version 1.0 Color Unbalance ? Color Interpolate ? END 1. Adjust user A, 0, B 2. Adjust color temperature R, G, B 3. Check signalbetween IC01 to W01 it analog 4. Calibrate ADC with pattern that 32 scales of gray if analog 1. Check signal (ICO2 to W07) 2. Check signal (IC11 to ICO2) II analog 3. Check signal (WO6 to ICO2) if analog 4. Check signal (IC01 to ICO2) if analog 5. Check signal (W01 to IC01) if analog Page 52 Confidential - Do Not Copy

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Service
Manual
VP150m
ViewSonic
September
2000
-
Version
1.0
TROUBLE
SHOOTING
POOR
IMAGE
QUALITY
I
Start
Image
size
OK
?
Vertical
Stripe
?
Position
Shift
?
Horizontal
Stripe
?
Too
dark
or
light
?
II
means
image
exced
or
less
than
display
area
1.
Is
scaling
in
fill
all
2.
Do
auto
sync
function
will
full
p
r.
screen
pattern
3.
Is
the
timing
supported
4.
Check
IC11
it
digital
5.
Check
IC01
it
analog
S.
Check
power
of
3.3V
If
analog
7.
Check
ri
pple
(DC
-AC)
1.
Do
auto
tune
function
with
lull
screen
pattern)
2.
Is
the
timing
supported
310
3.
Adjust
H
-Size
if
analog
4.
Check
IC01
if
analog!
5.
Check
power
of
3.3V
If
analog
8.
Check
ri
pple
(DC
-AC)
Y
)
1
.
1.
Do
autosync
function
will
full
screen
patternl
2.
Is
the
timing
supported
3.
Adjust
FIN
-Position
If
analog
1.
Do
autosync
function
will
full
screen
patteml
2.
Is
the
timing
supported
3.
Adjust
His
-Position
if
analog
4.
Check
power
of
3.3V
if
analog
5.
Check
ri
pple
(DC
-DC)
1.
Adjust
contrast
&
brightness
2.
Adjust
color
3.
Adjust
user
R,
G,
B
4.
Check
backlight
(inverter)
5.
Check
signal
between
IC23
and
VEE
6.
Calibrate
ADC
with
pattern
that
32
scales
of
gray
if
analog
Color
Unbalance
?
Color
Interpolate
?
END
1.
Adjust
user
A,
0,
B
2.
Adjust
color
temperature
R,
G,
B
3.
Check
signalbetween
IC01
to
W01
it
analog
4.
Calibrate
ADC
with
pattern
that
32
scales
of
gray
if
analog
1.
Check
signal
(ICO2
to
W07)
2.
Check
signal
(IC11
to
ICO2)
II
analog
3.
Check
signal
(WO6
to
ICO2)
if
analog
4.
Check
signal
(IC01
to
ICO2)
if
analog
5.
Check
signal
(W01
to
IC01)
if
analog
Page
52
Confidential
—
Do
Not
Copy