Sharp LC-37XD1E Service Manual page 35

No sound from EXT4 (AUDIO)
connecting an external 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?
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?
YES
Is the audio signal properly sent from pins (28) and (27) of IC3701 ?
No sound from external input devices (2) -2
No sound from EXT5
(AUDIO) connecting an exter-
nal input device.
<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
Is HDMI-L audio signal sent
to pin (50) of IC3701?
Is HDMI-R audio signal sent
to pin (51) of IC3701?
YES
YES
Is the audio signal of pins (1)
and (7) of IC303 (OP-AMP)
sent properly?
YES
Is the audio output signal of
pins (13) and (16) of IC302/
IC301(MAIN-AMP) normal?
YES
. Check CONNECTOR(P301),
SP_substrate(D790WJ/
D791WJ) and
SP-BOX(right and left).
4 – 4
LC-37XD1E/RU
NO Check output of pins (13) and (3) of IC2704
and peripheral circuits.
NO Check IC3701 or peripheral circuits.
NO Check IC303 or peripheral circuits.
NO Check IC302/IC301 (MAIN-AMP), HEAD-
PHONE and peripheral circuits.