Read Sharp XG-PH70X (serv.man4) Service Manual online
XG-PH70X/XG-PH70X-N
4 – 15
VIDEO sync signal check
Measure TL8016 with an oscilloscope (vertical sync signal
check).
check).
Is the vertical sync signal normal?
NO
Go to "Input signal setting check".
YES
Measure TL8015 with an oscilloscope (horizontal sync signal
check).
check).
Is the horizontal sync signal normal?
NO
Go to "Input signal setting check".
YES
Are the horizontal and vertical sync signals sent to R8030 and
TL8029?
TL8029?
NO
IC8010 is defective.
YES
Is the specified clock (1.6 MHz) sent to Q8002 (B)?
NO
IC8010 is defective.
YES
End
Checking of S-Video input
Feed the S-VIDEO signal to INPUT5.
Select INPUT5 by using the panel key
or remote control.
or remote control.
Is a picture sent?
NO
Go to "VIDEO sync signal check".
Execute the process adjustment.
YES
Is a picture distorted?
YES
Go to "VIDEO sync signal check".
NO
Are colors normal?
NO
Is the color difference signal fed to
C8095?
C8095?
YES
IC8010 is defective.
YES
NO
End
Is the signal applied to R8090?
YES
The peripheries of Q8006, 8008
and 8010 are defective.
and 8010 are defective.
NO
Is the signal applied to the pin (21)
of SC8001?
of SC8001?
YES
The periphery of R8090 is defec-
tive.
tive.
NO
The terminal PWB is defective.
7
7
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