Read Sharp LC-121M2E (serv.man3) Service Manual online
24
LC-121M2E
LC-150M2E
LC-150M2E
LC-121M2E
LC-150M2E
LC-150M2E
No sound
Check speaker
unit and its
peripheral parts.
unit and its
peripheral parts.
Check IC305 and
its peripheral
parts.
its peripheral
parts.
Check IC704,
Q704, Q706 and
their peripheral
parts.
Q704, Q706 and
their peripheral
parts.
Check IC310,
IC311 and their
peripheral parts.
IC311 and their
peripheral parts.
Are output at pin
7 of IC310 and it
of IC311 normal?
7 of IC310 and it
of IC311 normal?
Check speaker
unit and its
peripheral parts.
unit and its
peripheral parts.
Check IC312 and
its peripheral
parts.
its peripheral
parts.
Is output at pins
3 and 5 of IC308
normal?
3 and 5 of IC308
normal?
Is output at pins
10 and 17 of
IC305 normal?
10 and 17 of
IC305 normal?
Check IC305
and its peripheral
parts.
and its peripheral
parts.
Check IC308
and its peripheral
parts.
and its peripheral
parts.
Is the pin 18 of
IC2001 in Low
state?
IC2001 in Low
state?
Is output at pins
7 and 18 of
IC312 normal?
7 and 18 of
IC312 normal?
Is output at pins
10,14 and 17 of
IC305 normal?
10,14 and 17 of
IC305 normal?
Is 13V input at
pin 9 of IC305
as specified?
pin 9 of IC305
as specified?
Is the pin 9 of
IC2001 in Low
state?
IC2001 in Low
state?
Muting is applied.
Check the
FSMUT line.
Check the
FSMUT line.
YES
YES
YES
YES
YES
YES
YES
YES
Check IC302,
Q301, Q302
and their
peripheral parts.
Q301, Q302
and their
peripheral parts.
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
Check IC305
and its
peripherals.
and its
peripherals.
Check Q306,
Q307, IC304 and
their peripherals.
Q307, IC304 and
their peripherals.
NO
NO
YES
Muting is applied.
Check the
LMUTE line.
Check the
LMUTE line.
No sound (Front
and rear speaker)
and rear speaker)
No sound
(AV1 output)
(AV1 output)
No sound
(Front speaker)
(Front speaker)
Check speaker
and its
peripherals.
and its
peripherals.
Are Q306, Q307
and IC304
normal?
and IC304
normal?
Is output at pin
14 of IC305
normal?
14 of IC305
normal?
Is the pin 10 of
IC2001 in Low
state?
IC2001 in Low
state?
YES
YES
YES
YES
No sound
(Rear speaker)
(Rear speaker)
Check in/output voltages of IC406.
YES
No colour appears
No colour (AV1, AV2 and Component)
Is output voltages
at pins 3 and 6 of
IC406 normal?
at pins 3 and 6 of
IC406 normal?
Check peripherals.
Are these voltages
as follows of IC801
normal?
pins 51 and 52
(input)
pins 41, 42 and
43 (output)
as follows of IC801
normal?
pins 51 and 52
(input)
pins 41, 42 and
43 (output)
Check IC801 and
its peripheral
parts.
its peripheral
parts.
No colour (AV1, AV2)
Is output voltages
at pin 7 of IC405
normal?
at pin 7 of IC405
normal?
Is input voltages
at pin 13 of
IC801 normal?
at pin 13 of
IC801 normal?
Is output voltages
at pins 5 and 6 of
IC801 normal?
at pins 5 and 6 of
IC801 normal?
Check in/output
voltages of IC406.
voltages of IC406.
Check IC405 and
its peripheral
parts.
its peripheral
parts.
Check peripherals.
No colour (Component)
YES
YES
YES
NO
NO
NO
NO
NO
Check IC801 and
its peripheral
parts.
its peripheral
parts.
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