Sharp XV-Z90E, Service Manual

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26
XV-Z90E
XV-Z91E
Feed the composite video signal to
INPUT 4. Select INPUT 4 using the
set's key or the remote controller.
Does the picture appear? Is the picture disturbed?
End.
Is the picture signal inputted to the
connector TC (9) pin?
Yes
Yes
No
No
Yes
Check the TERMINAL2 PWB.
No
Is the picture signal inputted to the
(1) pin of IC3105?
Yes
Check the VIDEO-IN signal
line ofIC3502 and IC3503.
No
Is input coming to IC3104 (1) (3) (5)?
Yes
Check IC3102 peripheral circuits.
No
Is output coming from IC3104 (16) (18) (20)?
Yes
Check IC3104 peripheral circuits.
No
Is the picture signal inputted to IC6004 (43) (48) (54)
and the synchronized signal inputted to (30) (31)?
Yes
Check around IC3104, IC6001 and IC6002.
No
Is each digital output coming on IC6004 (64) (65) (66) (67)?
Yes
Check IC6004 peripheral circuits.
No
Is output coming from IC8001, DPORT?
Check the formatter PWB.
Yes
Check IC8001 peripheral circuits.
No
Is it N358 signal?
No
Check around IC3501, 3505.
Yes
Is it PAL?
No
Check around IC3504, 3506.
Yes
Is it SECAM?
Check the color system, around IC3105. Others.
No
Check around IC 3105.
Malfunction of the color
system is thinkable.
Yes
Checking of Video Input
Check IC3102 peripheral
circuits.
1
3
No Yes
Is synchronized signal
coming to IC3102 (28) (29)
pins?
2
Note
In case of N358, Y/C separates at IC3505 3 DY/C and inputted
to IC3105 (5) (7) pins.
In case of PAL system, Y/C separates at IC3506 3 Line COM
and inputted to (39) (41) of IC3105.
The video is outputted from (21) (22) (23) at color difference
from IC3105.