Sharp XG-PH70X Service Manual page 53

RGB signal check
Is the Signal Type set 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?
YES
The periphery of IC8025 is defec-
tive.
NO Set the Signal Type to RGB.
NO Are signals supplied to C8164,
C8165 and C8166?
YES
The periphery of IC8017 is defec-
tive.
4 – 11
XG-PH70X/XG-PH70X-N (1st. Edition)
NO Go to "Video input check".