Read Sharp XV-Z91E (serv.man10) Service Manual online
25
XV-Z90E
Checking of SOG Circuit
Measure the (7) pin of IC5012
with an oscilloscope.
with an oscilloscope.
This is the failure of the SOG
synchronization separator circuit.
synchronization separator circuit.
Is there the Y signal including sync
signal?
signal?
Measure the (7) pin of IC5010
with an oscilloscope.
with an oscilloscope.
Is the composite synchronized
signal regenerated at proper timing?
signal regenerated at proper timing?
No
Is there output of the (25) pin
of IC3102?
of IC3102?
No
The SOG circuit is normal.
End.
Yes
Yes
Yes
Check around Q5002.
No
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.
signal to INPUT 3. Select INPUT 3
with the keys on the main body or
the remote controller.
Is the signal N358?
Does the picture appear?
Is the picture disturbed?
End.
Is the picture signal inputted to the
connector TC (5) (7) pins?
connector TC (5) (7) pins?
Yes
No
No
No
No
Yes
No
In the picture signal inputted to
IC3105 (43) (44) pins?
IC3105 (43) (44) pins?
Yes
Check the input side PWB .
Check IC3505 and the
peripheral circuits of the IC.
peripheral circuits of the IC.
Yes
Yes
Check of the S-Video terminal input.
Check the Y, C signal
lines.
lines.
Check IC3105 and the
peripheral circuits of the
IC.
peripheral circuits of the
IC.
1
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).
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).
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