![background image](http://html1.mh-extra.com/html/viewsonic/g90f-b-3/g90f-b-3_service-manual_1020355048.webp)
4.
Vertical deflection is defective
﹒
Vertical is defective
The picture is one
horizontal line
Is the waveform pin14 of
IC401 normal?
Check the deflection Yoke
Is the waveform at pin6
of IC501 normal?
R502, R503 are defective
Check V-sync of IC301
pin32 or signal cable
Is the IC501 pin2=13V
Pin5 =-11V?
Is the waveform of IC401
pin21, pin23 normal?
R502, R503 are normal?
Check power supply
+12V, -12V
IC401 is defective
5Vp-p
45Vp-p
Yes
Yes
Yes
Yes
No
No
No
Yes
No
No
45
ViewSonic
Corporation
Co
nfidential
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Do
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Copy
G90f/B-3
Summary of Contents for G90f/B-3
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Page 102: ...9 Block Diagram 99 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 103: ...10 Schematic Diagrams 100 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
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