Sharp XG-PH70X (serv.man4) Service Manual ▷ View online
XG-PH70X/XG-PH70X-N
4 – 9
Checking the RGB input
Feed the sync separation analog RGB signal to INPUT1.
Select INPUT1 by using the panel key or remote control.
Is a picture displayed?
NO
Go to "Video input check".
YES
Is a picture distorted?
YES
Go to "Checking of sync signal".
NO
Are three colors (R, G and B) displayed?
NO
Go to "RGB signal check".
YES
Perform AUTOSYNC.
Is the contour displayed properly?
NO
IC8017 or the periphery of IC8025 is defective.
YES
Are vertical stripe patterns distorted?
YES
IC8017 or the periphery of IC8025 is defective.
NO
End
Video input check
Go to "Input signal setting check".
Is a video signal applied to the land
of C8165?
NO
Is signal applied to the pin 13 of
SC8001 (B to B connector)?
SC8001 (B to B connector)?
NO
The signal source or connector is defec-
tive.
tive.
YES
YES
Go to "Checking the sync signal".
The signal path is defective.
Check CRs from SC8001 to IC8017.
Check CRs from SC8001 to IC8017.
IC8025 or IC8017 is defective.
1
2
3
XG-PH70X/XG-PH70X-N
4 – 10
Input signal setting check
Is the input menu selected properly?
NO
Select the proper menu.
YES
Are the connectors connected properly?
NO
Connect the connectors properly.
YES
End
Checking of Sync signal
Is the vertical sync signal applied to
the pin 11 of IC8012?
NO
Go to “Input signal setting check”.
The periphery of SC8001 is defective.
YES
Is the horizontal sync signal applied
to the pin 5 of IC8012?
to the pin 5 of IC8012?
NO
Go to “Input signal setting check”.
The periphery of SC8001 is defective.
YES
Is the vertical sync signal applied to
TL8016?
TL8016?
NO
IC8012 is defective.
YES
Is the horizontal sync signal applied
to TL8015?
to TL8015?
NO
IC8012 is defective.
YES
Is the timing of vertical and horizon-
tal sync signals correct?
tal sync signals correct?
YES
The sync signal is normal.
NO
Is the signal generator (input
source) correct?
source) correct?
NO
Properly set the signal source.
YES
The periphery of SC8001 is defec-
tive.
tive.
2
1
3
2
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.
XG-PH70X/XG-PH70X-N
4 – 12
Checking the periphery of GA5
Select R, G and B separately in the pat-
tern menu of the process mode.
Are R, G and B of a picture sent prop-
erly?
YES
End of checking the periphery of
GA5.
GA5.
NO
Measure pins 31, 21 and 11of SC8004
with an oscilloscope.
These signals are MSB of B/G/R.
with an oscilloscope.
These signals are MSB of B/G/R.
Do the contents selected in the pattern
menu correspond with the measured
signals?
YES
The formatter PWB is defective.
NO
Is the clock applied to the pin 58 of
SC8004?
SC8004?
NO
Is the clock (65 MHz) applied to
FL8009?
FL8009?
YES
IC8032 is defective.
YES
NO
Is the clock (65 MHz) applied to
FL8006?
FL8006?
NO
X8004 is defective.
YES
Measure TL8047, 8048, and 8049 with
an oscilloscope.
an oscilloscope.
IC8025 is defective.
Do the contents selected in the pattern
menu correspond with the measured
signals?
NO
IC8025 is defective.
YES
IC8032 is defective.
Click on the first or last page to see other XG-PH70X (serv.man4) service manuals if exist.