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