Service manual

21
LC-20B4M
TROUBLE SHOOTING TABLE (Continued)
Is Pin (53) of
IC2001 at “L”?
Check all the settings on the microprocessor
’s adjust process menu.
Are outputs at
Pins (1) and (7)
of IC3301/
IC3303 as
specified?
Are inputs at
Pins (2) and (4)
as well as
outputs at Pins
(8) and (12), all
of IC3305, as
specified?
Muting effect is
on. Check the
FSMUTE line.
Check IC3301,
IC3303 and
their peripheral
parts.
Are input and
output of
IC3304 as
specified?
Check IC3304
and its
peripheral parts.
Check the line
in question,
IC3301 and its
peripheral
parts.
Check the
speakers and
their peripheral
parts.
Is Pin (55) of
IC2001 at “L”?
Check the
headphone and
its peripheral
parts.
Check Q2004,
J3303 harness
and their
peripheral parts.
Is Pin (58) of
IC2001 at “L”?
Are outputs at
Pins (14) and
(15) of IC3501
as specified?
Check the line
in question.
Check the
LMUTE line.
Check IC3501,
IC3304 and its
peripheral
parts.
Is output at Pins
(15) and (16) of
tuner as
specified?
Is input at Pin
(67) of IC3304
as specified?
Check IC3304,
X3301 and
their peripheral
parts.
Check the
tuner and its
peripheral
parts.
Check Q3201,
Q3202 and
their peripheral
parts.
No sound
from
speakers
No sound
No sound
from
headphone
No sound
from output
line
TV sound
failure
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
No
Yes
Yes
No
No
Yes