XV-Z91E (serv.man10). Troubleshooting table - Sharp Projector Service Manual (repair manual). Page 6

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.