Read Sharp XG-PH70X (serv.man4) Service Manual online
XG-PH70X/XG-PH70X-N
4 – 11
RGB signal check
Is the Signal Type set to RGB?
NO
Set the Signal Type to RGB.
YES
Enter the process mode.
Select R, G and B separately in the
pattern menu.
Go to "Checking the periphery of
GA5".
Set the signal generator to the gra-
dation signal to check the input sig-
nal.
Measure TL8027, 8029 and 8031
with an oscilloscope.
(MSBbit after AD conversion)
Are signals properly sent from
TL8027, 8029 and 8031?
NO
Are signals supplied to C8164,
C8165 and C8166?
C8165 and C8166?
NO
Go to "Video input check".
YES
YES
The periphery of IC8025 is defec-
tive.
tive.
The periphery of IC8017 is defec-
tive.
tive.
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