Sharp LC-20B6E (serv.man9) Service Manual ▷ View online
30
LC-20B6E
No sound
(1/2)
No sound from front speakers
No sound from headphone
No sound from output line
Check all the settings microprocessor's adjust process menu.
Is the pin (53) of IC2001
Muting effect is on.
Is the pin (52) of IC2001
Muting effect is on.
Is output at pins (33)
Check IC3
201 and its
in the "L" state?
No
Check the FSMUTE
in the "L" state?
No
Check the HP_MUTE
and (34) of IC3201
No
peripheral parts.
Y
es
line.
Y
es
line.
norma
l?
Ye
s
Is output at pins (27) and
Check IC3201 and its
Is output at pins (24) and
Check IC3201 and its
Is output at pins (1) and
Ch
eck IC3211 and its
(28) of IC3201 normal?
No
peripheral parts.
(25) of IC3201 normal?
No
peripheral parts.
(7) of IC3211 normal?
No
peripheral parts.
Ye
s
Ye
s
Is output at pins (8) and
Check IC3304 and its
Is output at pins (1) and
Check IC3305 and its
(12) of IC3304 normal?
No
peripheral parts.
(7) of IC3305 normal?
No
peripheral parts.
Ye
s
Ye
s
Check front speakers
Check headphone jack
and connection cable.
and connection cable.
31
LC-20B6E
No sound
(2/2)
No sound from SCART
SCART sound failure
TV sound failure
Check all the settings microprocessor's adjust process menu.
Is output at pins (36) and
Check IC3201 and its
Is input at pins (2) and
Check theire lines and
Is output at pin (20)
Check th
e tuner,IC2203
(37) of IC3201 normal?
No
peripheral parts.
(4) of IC3401 normal?
No
theire peripheral parts.
of IC2203 normal?
No
and their peripheral parts.
Ye
s
Ye
s
Is output at pins (1) and
Check IC3210 and its
Is input at pin (67)
Check IC3201 and its
(7) of IC3210 normal?
No
peripheral parts.
of IC3201 normal?
No
peripheral parts.
31
LC-20B6E
No sound
(2/2)
No sound from SCART
SCART sound failure
TV sound failure
Check all the settings microprocessor's adjust process menu.
Is output at pins (36) and
Check IC3201 and its
Is input at pins (2) and
Check theire lines and
Is output at pin (20)
Check th
e tuner,IC2203
(37) of IC3201 normal?
No
peripheral parts.
(4) of IC3401 normal?
No
theire peripheral parts.
of IC2203 normal?
No
and their peripheral parts.
Ye
s
Ye
s
Is output at pins (1) and
Check IC3210 and its
Is input at pin (67)
Check IC3201 and its
(7) of IC3210 normal?
No
peripheral parts.
of IC3201 normal?
No
peripheral parts.
31
LC-20B6E
No sound
(2/2)
No sound from SCART
SCART sound failure
TV sound failure
Check all the settings microprocessor's adjust process menu.
Is output at pins (36) and
Check IC3201 and its
Is input at pins (2) and
Check theire lines and
Is output at pin (20)
Check th
e tuner,IC2203
(37) of IC3201 normal?
No
peripheral parts.
(4) of IC3401 normal?
No
theire peripheral parts.
of IC2203 normal?
No
and their peripheral parts.
Ye
s
Ye
s
Is output at pins (1) and
Check IC3210 and its
Is input at pin (67)
Check IC3201 and its
(7) of IC3210 normal?
No
peripheral parts.
of IC3201 normal?
No
peripheral parts.
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