Read Sharp LC-37RD2E (serv.man5) Service Manual online
LC-32RD2E/RU, LC-37RD2E/RU
4 – 4
No sound from external input devices (5)
No sound from EXT5 (AUDIO) connecting an external input
device.
Check that Option-HDMI Setup-Audio select is set to “Analog”.
<EXT5>
OK
Is HDMI-L audio signal sent from J2701 terminal to pin (14) of
IC2721 (SW)?
IC2721 (SW)?
NO
Check the line between J2701 and IC2721.
(Q2701, Q2702, etc.)
(Q2701, Q2702, etc.)
Is HDMI-R audio signal sent from J2701 terminal to pin (5) of
IC2721 (SW)?
IC2721 (SW)?
YES
Is HDMI-L audio signal sent to pins (10) of IC3001?
Is HDMI-R audio signal sent to pins (9) of IC3001?
Is HDMI-R audio signal sent to pins (9) of IC3001?
NO
Check output of pins (13) and (3) of IC2721 and peripheral cir-
cuits.
cuits.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (6)
No sound from an external input device connected to EXT7.
<EXT7>
Is EX-L audio signal sent from pin (5) of J1201 terminal to pin
(12) of IC2721 (SW)?
Is EX-L audio signal sent from pin (5) of J1201 terminal to pin
(12) of IC2721 (SW)?
NO
Check the line between J1401 and IC2721.
(Q1401, Q1402, P1401/P2791, etc.)
(Q1401, Q1402, P1401/P2791, etc.)
Is EX-R audio signal sent from pin (4) of J1201 terminal to pin (1)
of IC2721 (SW)?
of IC2721 (SW)?
YES
Is EX-L audio signal sent to pin (10) of IC3001 (VCT)?
Is EX-R audio signal sent to pin (9) of IC3001 (VCT)?
Is EX-R audio signal sent to pin (9) of IC3001 (VCT)?
NO
Check the line between IC2721 and IC3001.
YES
Refer to “No sound output in all modes”.
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