Sharp XG-C50XE (serv.man24) Service Manual ▷ View online
41
XG-C50X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
No
Yes
Yes
Yes
Checking of R, G and B Signals
Is the signal type set to RGB?
Set the signal type to RGB.
No
No
Set the process mode.
Select R, G and B individually on
the pattern menu.
the pattern menu.
Go to "Checking of GA4 and Its
Periphery".
Periphery".
For checking the input signal, set
the signal generator to gradation
signal.
the signal generator to gradation
signal.
Measure the signals at TL8169,
TL8170 and TL8180 on the
oscilloscope. (MSB bit after A/D
conversion)
TL8170 and TL8180 on the
oscilloscope. (MSB bit after A/D
conversion)
Are there the specified signals at
TL8169, TL8170 and TL8180?
TL8169, TL8170 and TL8180?
Does the signal come to C8062,
C8070 and C8078?
C8070 and C8078?
Go to "Confirmation of Video Input".
IC8013 or its periphery is defective.
IC8025 or its periphery is defective.
42
XG-C50X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
Checking of GA4 and Its Periphery
Select R, G and B individually on
the pattern menu in the process
mode.
the pattern menu in the process
mode.
Is picture outputted appropriately
in R, G and B?
in R, G and B?
Checking of GA4 and its periphery
ends.
ends.
Measure the signals at pins (54),
(66) and (78) of SC8001 on the
oscilloscope. These signals are
MSB of B/G/R/.
(66) and (78) of SC8001 on the
oscilloscope. These signals are
MSB of B/G/R/.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
signals match with those selected
on the pattern menu?
The OUTPUT PWB is defective.
Does the clock signal come to pins
(40) and (42) of SC8001?
(40) and (42) of SC8001?
Is there the clock (37.5 MHz)
signal at TL8114?
signal at TL8114?
IC8029 is defective.
Is there the clock (37.5 MHz)
signal at FL8110?
signal at FL8110?
X8005 is defective.
IC8025 is defective.
Measure the signals at TL8106,
TL8107, TL8108, TL8110 and
TL8111 on the oscilloscope.
TL8107, TL8108, TL8110 and
TL8111 on the oscilloscope.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
signals match with those selected
on the pattern menu?
IC8025 is defective.
IC8029 is defective.
43
XG-C50X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Yes
No
Yes
Yes
No
No
No
4
4
Checking of Component Input
(except 480I)
(except 480I)
Feed the component signal to
INPUT1.
INPUT1.
Select INPUT1 using the set's key
or the remote controller.
or the remote controller.
Does the picture appear?
Go to "Checking of SOG Circuit".
Are the colors normal?
Is the signal type set at
component?
component?
Set the signal type to component.
Is the contour of picture clear?
IC8013 or IC8025 is defective.
The component is normal. End.
Carry out the process adjustment.
44
XG-C50X
Yes
Yes
No
No
Checking of SOG Circuit
Measure the signal at pin (2) of
IC8365 on the oscilloscope.
IC8365 on the oscilloscope.
Is the composite sync signal
reproduced in correct timing?
reproduced in correct timing?
The SOG circuit is normal. End.
Measure the land of C8070 on the
oscilloscope.
oscilloscope.
Is there the Y signal including sync
signal?
signal?
Go to "Confirmation of Input Signal
Setting".
Setting".
The SOG sync separation circuit
(INPUT PWB) is defective.
(INPUT PWB) is defective.
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
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