Sharp XV-Z90E Service Manual page 25

Checking of SOG Circuit
Measure the (7) pin of IC5012
with an oscilloscope.
Is the composite synchronized
signal regenerated at proper timing?
No
Measure the (7) pin of IC5010
with an oscilloscope.
Is there the Y signal including sync
signal?
Yes
This is the failure of the SOG
synchronization separator circuit.
Check of the S-Video terminal input.
Input the S-Video terminal (Y, C)
signal to INPUT 3. Select INPUT 3
with the keys on the main body or
the remote controller.
Does the picture appear?
No
Is the picture signal inputted to the
connector TC (5) (7) pins?
No
Check the input side PWB .
Note
Only in case of N358, the noise reduction
function of IC3505 is used and the noise is
reduced, so it is inputted to IC3105 (5), (7).
Yes
The SOG circuit is normal.
End.
No
Is there output of the (25) pin
of IC3102?
Yes
Is the picture disturbed?
Yes
1
Yes
In the picture signal inputted to
IC3105 (43) (44) pins?
Yes
Is the signal N358?
Yes
Check IC3505 and the
peripheral circuits of the IC.
25
No
Check around Q5002.
Yes
No
End.
No
Check the Y, C signal
lines.
Check IC3105 and the
No
peripheral circuits of the
IC.
XV-Z90E
XV-Z91E