Read Sharp LC-13B2E (serv.man4) Service Manual online
17
LC-13B2E
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
IC901 normal?
Is output at pins
(1) and (7) of
IC903 normal?
Yes
Yes
No
No
No
No
No
No sound
from front
speakers
Is output at pins
(1) and (7) of
IC303 normal?
Yes
Is output at pins
(8) and (12) of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and its
peripheral parts.
Check IC903
and its
peripheral parts.
Check IC303
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(26) and (27) of
IC901 normal?
Is output at pins
(1) and (7) of
IC903 normal?
Yes
Yes
No
No
No
No
No
No
Is output at pins
(1) and (7) of
IC303 normal?
Yes
Is output at pins
(8) and (12) of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and its
peripheral parts.
Check IC903
and its
peripheral parts.
Check IC303
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
Yes
Is output at
Q301 normal?
Check Q301
and connection
cable.
No sound
from
headphone
TV sound
failure
Is output at pins
(37) and (38) of
IC901 normal?
Is output at pins
(1) and (7) of
IC902 normal?
Check IC901
and its
peripheral parts.
Check IC902
and its
peripheral parts.
Yes
No
No
No
No sound
from output
line
Is output at pin
(1) of W7 tuner
normal?
Is input at pin
(67) of IC901
normal?
Check the tuner
and its
peripheral parts.
Check IC901,
MONOS/SIF
line and their
peripheral parts.
Yes
No
TROUBLE SHOOTING TABLE
(Continued)
