Sharp XV-C100U, Service Manual

Page: 28 / 73

XV-C100U
28
No horizontal sync
Are video signal at pin (21) or (29) of
IC801 and horizontal drive signal at
pin (58) of IC801 in sync with each
other?
Yes
Yes
Is there horizontal sync signal output
at pin (10) of IC503?
No
Check IC503 and its
peripheral circuits.
Yes
No
No
No
Yes
Is there horizontal drive signal output
at pin (56) of IC801?
Is there composite sync signal output
at pin (4) of IC504?
IC504 defective.
Check IC1603, IC1607 and IC1608,
all located on the control PWB. Check
also their peripheral parts.
Check pins (58) and
(59) of IC801 and their
peripheral parts.
No vertical sync
No
Is there vertical sync signal output at
pin (4) of IC801?
Check IC801 and its
peripheral circuits.
Yes
No
Is there vertical sync signal input at
pin (11) of IC502?
Yes
Is there vertical sync signal output at
pin (10) of IC502?
No
Check IC502 and its
peripheral parts.
Yes
Check IC1606 and its peripheral
parts.
TROUBLE SHOOTING TABLE (Continued)
Check pins (17) and (18)
of IC801, IC501 and its
peripheral circuits.
Check Q827.