Read Sharp LC-37XD1E (serv.man4) Service Manual online
LC-37XD1E/RU
4 – 4
No sound from external input devices (2) -2
No sound from EXT4 (AUDIO)
connecting an external input
device.
connecting an external input
device.
No sound from EXT5
(AUDIO) connecting an exter-
nal input device.
(AUDIO) connecting an exter-
nal input device.
<EXT4>
Is D-SUB-L audio signal sent
from J2702 to pin (15) of
IC2704?
Is D-SUB-R audio signal sent
from J2702 to pin (2) of IC2704?
Is D-SUB-L audio signal sent
from J2702 to pin (15) of
IC2704?
Is D-SUB-R audio signal sent
from J2702 to pin (2) of IC2704?
<EXT5>
Is HDMI-L audio signal sent
from J2701 to pin (14) of
IC2704?
Is HDMI-R audio signal sent
from J2701 to pin (5) of
IC2704?
Is HDMI-L audio signal sent
from J2701 to pin (14) of
IC2704?
Is HDMI-R audio signal sent
from J2701 to pin (5) of
IC2704?
YES
YES
Is D-SUB-L audio signal sent to
pin (50) of IC3701?
Is D-SUB-R audio signal sent to
pin (51) of IC3701?
pin (50) of IC3701?
Is D-SUB-R audio signal sent to
pin (51) of IC3701?
Is HDMI-L audio signal sent
to pin (50) of IC3701?
Is HDMI-R audio signal sent
to pin (51) of IC3701?
to pin (50) of IC3701?
Is HDMI-R audio signal sent
to pin (51) of IC3701?
NO
Check output of pins (13) and (3) of IC2704
and peripheral circuits.
and peripheral circuits.
YES
YES
Is the audio signal properly sent from pins (28) and (27) of IC3701 ?
NO
Check IC3701 or peripheral circuits.
YES
Is the audio signal of pins (1)
and (7) of IC303 (OP-AMP)
sent properly?
and (7) of IC303 (OP-AMP)
sent properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of
pins (13) and (16) of IC302/
IC301(MAIN-AMP) normal?
pins (13) and (16) of IC302/
IC301(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEAD-
PHONE and peripheral circuits.
PHONE and peripheral circuits.
YES
.
Check
CONNECTOR(P301)
and SP-BOX(right and left).
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