Sharp LC-37XD10, Service Manual

Page: 37 / 190

LC-37XD10E/RU
4 – 4
No sound from external input devices (2) -2
No sound from EXT4 (AUDIO)
connecting an external input
device. No sound from EXT5
(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? <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?
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? Is HDMI-L audio signal sent
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.
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? NO Check IC303 or peripheral circuits.
YES
Is the audio output signal of
pins (13) and (16) of IC302/
IC301(MAIN-AMP) normal? NO Check IC302/IC301 (MAIN-AMP), HEAD-
PHONE and peripheral circuits.
YES
. Check CONNECTOR(P301)
and SP-BOX(right and left).