Sharp Aquos LC 20B1U, Руководство по обслуживанию

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LC-20B1U
28
No sound fr
om
speaker
s
Yes
No
Is Pin (53) of IC2001 at
“L
”?
Chec
k all the settings on the microprocessor
’s adjust process men
u.
No sound
No
Are outputs at Pins (1) and (7) of IC3301/ IC3302/ IC3303 as specified?
Yes
No
Are inputs at Pins (2) and (4) as w
ell as
outputs at Pins (8) and (12), all of IC3305, as specified?
Muting eff
ect is
on.
Chec
k the
FSMUTE line
.
Chec
k IC3301,
IC3302, IC3303 and their per
ipher
al par
ts
.
Yes
No
Are input and output of IC3304 as specified?
Chec
k IC3304
and its per
ipher
al par
ts
.
Chec
k the line
in question, IC3301 and its per
ipher
al
par
ts
.
Yes
Chec
k the
speak
ers and
their per
ipher
al
par
ts
.
No sound fr
om
headphone
Yes
No
Is Pin (55) of IC2001 at
“L
”?
Chec
k the
headphone and its per
ipher
al
par
ts
.
Chec
k Q2007,
J3500 har
ness
and their per
ipher
al par
ts
.
No sound fr
om output
line
Yes
No
Is Pin (58) of IC2001 at
“L
”?
No
Are outputs at Pins (14) and (15) of IC3501 as specified?
Yes
Chec
k the line
in question.
Chec
k the
LMUTE line
.
Chec
k IC3501,
IC3304 and its per
ipher
al
par
ts
.
TV sound failure
Yes
No
Is output at Pins (15) and (16) of tuner as specified?
No
Is input at Pin (67) of IC3304 as specified?
Yes
Chec
k IC3304,
X3301 and their per
ipher
al
par
ts
.
Chec
k the
tuner and its per
ipher
al
par
ts
.
Chec
k Q3201,
Q3202 and their per
ipher
al
par
ts
.