LC
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37D44E/S/RU-BK/GY
4 – 6
The audio signal is not output (3)
NO
No audio signal output from AUDIO_OUTPUT terminal.
Is audio signal output to pin(2/L-ch), (4/R-ch) of audio out-
put terminal J1304?
YES
Check the connection to J1304 and external devices.
NO
Is S-MUTE-LINE [pin(62) of IC2302(SUB_MICON)] at H?
YES
Check the peripheral circuits of IC2302 and S-MUTE_LINE.
(Q1303, etc.)
NO
Is audio signal sent to pins (22/L-ch) and (21/R-ch) of
IC3001(MAIN_MICON)?
YES
Check the line between J1304 and IC3001.
(Q1302, Q1301, etc.)
NO
Check IC3001 and its peripheral circuits.
The audio signal is not output (6)
No sound from HEDPHONE_OUTPUT terminal.
Is the HP_PLUG signal input into pin (208) of
MAIN_UNIT's IC3001 (MAIN_MICON) from pin (6) of a
headphone terminal (J1003)?
NO
Check the line between J1003 and IC3001.
(SC1001/P1001, IC3001, etc.)
YES
Is the audio signal output to pin(2/L-ch) pin(3/R-ch) of
headphone terminal J1003?
YES
Check HEAD-PHONE (J1003) or peripheral circuits.
NO
Is the audio signal input into pin (3) and (1) of connector
SC1001 from pin(3/L-ch),(1/R-ch) of connector P1001?
YES
Check the line between P1001 and J1003.
(SC1001/P1001, etc.)
NO
Is HP-MUTE-LINE [pin(40) of IC2302(SUB_MICON)] at
H?
YES
Check the peripheral circuits of IC2302 and HP-MUTE_LINE.
(Q1001, etc.)
NO
Is audio signal sent to pins (26/L-ch) and (25/R-ch) of
IC3001(MAIN_MICON)?
YES
Check the line between P1001 and IC3001.
(IC1102, etc.)
NO
Check IC3001 and its peripheral circuits.
