![background image](http://html1.mh-extra.com/html/viewsonic/a91f-1/a91f-1_service-manual_1020119049.webp)
4.
Vertical deflection is defective
﹒
Vertical is defective
The picture is one
horizontal line
Is the waveform pin14 of
IC401 normal?
Check the dflection Yoke
Is the waveform at pin5
of IC501 normal?
R502 is defective
Check V-sync of IC301
pin32 or signal cable
Is the IC501 pin2=13V
pin4=-11V?
Is the waveform of IC401
pin21, pin23 normal?
Are R502 normal?
Check power supply
+12V, -12V
IC401 is defective
5Vp-p
45Vp-p
Yes
Yes
Yes
Yes
No
No
No
Yes
No
No
46
ViewSonic
Corporation
Co
nfidential
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Do
Not
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A91f+-1
Summary of Contents for A91f+-1
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