Read Sharp LC-20B2EA Service Manual online
16
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No sound (1/2)
Check all the settins microprocessor's adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(27) and (28) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC1903 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC1901
and its
peripheral parts.
Check IC1903
and its
peripheral parts.
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
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC1901
and its
peripheral parts.
Check IC304
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
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
No
No
No sound
from output
line
Check the tuner
and its
peripheral parts.
Yes
No
Is output at pin
(11) of Tuner
normal?
Is input at pins
(67) and (69)
of IC1901.
Check IC1901
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3305 normal?
Check IC3305
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
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