Read Sharp LC-22SV2E (serv.man8) Service Manual online
25
LC-22SV2E
No sound
Check all the settins microprocessor's adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(26) and (27) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC1903 normal?
Yes
Yes
No
No
No
No
No
No sound
from front
speakers
Yes
Is output at pins
(8) and (12) of
IC3305 normal?
Muting effect is
on. Check the
FSMUTE line.
Check IC1901
and its
peripheral parts.
Is the pin (5) of
IC3305 in the
"H" state?
Yes
Muting effect is
on. Check the
SSTBY line.
Check IC1903
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC304 normal?
Yes
Yes
Check J2204
(Headphones).
Yes
No
No
No
Muting effect is
on. Check the
MP-MUTE line.
Check IC1901
and its
peripheral parts.
Check IC304
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
No sound from
RCA output line
Is output at pins
(37) and (38) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC1902 normal?
Check IC1901
and its
peripheral parts.
Check IC1902
and its
peripheral parts.
Yes
No
No
No
Check SCART
periphery parts.
Check IC1901
and its
periphery parts.
Yes
Check J3902,
J3903 and their
periphery parts.
Yes
Yes
No sound
from SCART
output line
Is output at pin
(11) of tuner
normal?
Is input at pins
(69) of IC1901
normal?
Check the tuner
and its
peripheral parts.
Check SIF1 and
SIF2 line and
their peripheral
parts.
Yes
No
No
Is output at pins
(33) and (34) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC3500 normal?
Check IC1901
and its
peripheral parts.
Check IC3500
and its
peripheral parts.
Yes
No
TROUBLE SHOOTING TABLE
(Continued)
