Sharp XV-Z9000U Service Manual page 39

Checking the GA4
peripheral circuits
Call the process mode, and
select R, G and B
separately on the pattern
menu.
Are there specified R, G
and B video output signals?
NO
Are the measured signals
the same as the signals
selected on the pattern
menu?
NO
Is there clock signal at
R974?
YES
Are there sync signals at
TL8026, TL8027 and
TL8028?
YES
Using the oscilloscope,
measure the signals at
TL8141 thru TL8148.
Are the measured signals
the same as the signals
selected on the pattern
menu?
YES
Using the oscilloscope,
measure the signals at
TL8106 thru TL8111.
Are the measured signals
the same as the signals
selected on the pattern
menu?
YES
IC8029 defective.
YES
End of checking the GA4
peripheral circuits.
YES
Output PWB defective.
NO
Is there clock signal
(37.125 MHz) at TL8114?
NO
Is there clock signal
(37.125 MHz) at FL8110?
YES
IC8025 defective.
NO
Are there sync signals at
TL8112 and TL8133?
YES
IC8029 defective.
NO
Digital panel PWB
defective.
NO
IC8025 defective.
39
YES
IC8029 defective.
NO
X8005 defective.
NO
IC8025 defective.
XV-Z9000U/E