Service manual

Notice :
1. Make sure VGA cable connect to PC directly and not through a Data transfer or Distribution......After this
action if Ghost image disappear, go to Yes; else, go to No.
2. Check the compatibility on the computer. If it is compatibility problem, feedback the information to ViewSonic;
else, go to No.
Yes
Yes
No
No
Yes
Change
Main Board
Change
Main Board
Change
VGA Cable
Change
LCD Panel
Is screen scrolling ?
Is screen flickering ?
Yes
Yes
Yes
Yes
No
No
End
Yes
No
No
Yes
Change
LCD Panel
Change
Inverter Board
Is LCD line defective ?
Bad Uniformity ?
Yes
No
Yes
Change
Main Board
Have line bar or noise?
Yes
Yes
No
1
Yes
No
Yes
Ghost image ?
No
Change
LCD Panel
Yes
Refer to
Notice 1
No
No
Change
Main Board
Adjust Fine
Tune Sharp-
ness or Auto
Adjustment
Adjust Fine
Tune Sharp-
ness or Auto
Adjustment
Refer to
Notice 2
No
Yes
Yes
Yes
ViewSonic Corporation
27
Confidential – Do Not Copy
VP171/b/s