Read Sharp LC-37RD2E (serv.man5) Service Manual online
LC-32RD2E/RU, LC-37RD2E/RU
4 – 3
No sound from external input devices (1)
No sound from an external input device connected to EXT1
(SCART1).
<EXT1>
Is IN1-L audio signal sent from pin (6) of SCART1 terminal
(J1101) to pin (14) of IC3001 (VCT)?
Is IN1-L audio signal sent from pin (6) of SCART1 terminal
(J1101) to pin (14) of IC3001 (VCT)?
NO
Check pins (6) and (2) of SCART1 and connection to an external
input device.
input device.
Is IN1-R audio signal sent from pin (2) of SCART1 terminal
(J1101) to pin (13) of IC3001 (VCT)?
(J1101) to pin (13) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (2)
No sound from an external input device connected to EXT2
(SCART2).
<EXT2>
Is IN2-L audio signal sent from pin (27) of SCART2 terminal
(J1101) to pin (12) of IC3001 (VCT)?
Is IN2-L audio signal sent from pin (27) of SCART2 terminal
(J1101) to pin (12) of IC3001 (VCT)?
NO
Check pins (27) and (23) of SCART2 and connection to an exter-
nal input device.
nal input device.
Is IN2-R audio signal sent from pin (23) of SCART2 terminal
(J1101) to pin (11) of IC3001 (VCT)?
(J1101) to pin (11) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (3)
No sound from an external input device connected to EXT3.
<EXT3>
Is IN3-L audio signal sent from pin (3) of J1201 terminal to pin
(16) of IC3001 (VCT)?
Is IN3-L audio signal sent from pin (3) of J1201 terminal to pin
(16) of IC3001 (VCT)?
NO
Check pins (3) and (5) of EXT3 (J1201) and connection to an
external input device.
external input device.
Is IN3-R audio signal sent from pin (5) of J1201 terminal to pin
(15) of IC3001 (VCT)?
(15) of IC3001 (VCT)?
YES
Refer to “No sound output in all modes”.
No sound from external input devices (4)
No sound from EXT4 (AUDIO) connecting an external input
device.
<EXT4>
Is D-SUB-L audio signal sent from J2711 to pin (15) of IC2721
(SW)?
Is D-SUB-L audio signal sent from J2711 to pin (15) of IC2721
(SW)?
NO
Check the line between J2711 and IC2721.
(Q2711, Q2712, etc.)
(Q2711, Q2712, etc.)
Is D-SUB-R audio signal sent from J2711 to pin (2) of IC2721
(SW)?
(SW)?
YES
Is D-SUB-L audio signal sent to pin (10) of IC3001?
Is D-SUB-R audio signal sent to pin (9) of IC3001?
Is D-SUB-R audio signal sent to pin (9) of IC3001?
NO
Check the line between IC2721 and IC3001.
YES
Refer to “No sound output in all modes”.
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