Sharp XG-PH70X (serv.man4) Service Manual ▷ View online
XG-PH70X/XG-PH70X-N
4 – 13
Component input (except 408i) check
Feed the component signal to
INPUT1.
INPUT1.
Select INPUT1 by using the panel key
or remote control.
or remote control.
Is a picture sent?
NO
Go to "SOG circuit check".
YES
Are colors normal?
YES
Is the contour displayed properly?
NO
IC8017 or IC8025 is defective.
NO
YES
Component is normal.
End.
End.
Is the Signal Type set to Component?
NO
Set the Signal Type to Compo-
nent.
nent.
Execute the process adjustment.
SOG circuit check
Measure TL8017 with an oscilloscope.
Is the composite sync signal reproduced at the right timing?
YES
SOG circuit is normal.
End.
End.
NO
Measure land of C8149 with an oscilloscope.
Is the Y signal including sync signal available?
NO
Go to "Input signal setting check".
YES
The SOG sync separation circuit (periphery of IC8015) is defective.
4
4
4
XG-PH70X/XG-PH70X-N
4 – 14
Checking of Video input
Feed the composite VIDEO signal
to INPUT4.
to INPUT4.
Use keys on the main unit or
remote control to select INPUT4.
remote control to select INPUT4.
Is a picture displayed?
NO
Go to "VIDEO sync signal check".
Execute the process adjustment.
YES
Is a picture displayed?
YES
Go to "VIDEO sync signal check".
NO
Are colors normal?
Is the VIDEO signal fed to C8103?
YES
NO
S-VIDEO input check
Is the signal applied to R8092?
YES
The peripheries of Q8007,8009
and 8011 are defective.
and 8011 are defective.
NO
Is the signal applied to the pin 23
of SC8001?
of SC8001?
YES
The periphery of R8092 is defec-
tive.
tive.
NO
The terminal PWB is defective.
Measure the clock of IC8010 at R8048.
Is the clock normal?
NO
IC8010 is defective.
YES
Go to "VIDEO sync signal check".
IC8025 is defective.
5
5
6
6
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
XG-PH70X/XG-PH70X-N
4 – 16
DVI digital input check
Feed the DVI digital signal to INPUT3.
Select INPUT3.
Is a picture displayed?
NO
YES
Is a picture distorted?
NO
YES
Are colors normal?
NO
The periphery of IC8020 is defective.
YES
The DVI digital input is normal.
Measure the vertical sync signal at the pin 13 of IC8012 and
the horizontal sync signal at the pin 3 of IC8012, respectively.
the horizontal sync signal at the pin 3 of IC8012, respectively.
Are the sync signals normal?
NO
The periphery of IC8020 is defective.
YES
Measure the clock at R8169.
Is the clock normal?
NO
The periphery of IC8020 is defective.
YES
The periphery of IC8025 is defective.
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