Sharp LC-32D44E Service Manual page 48

LC32D44E/S/RU-BK/GY (1st Eddition)
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?
Is S-MUTE-LINE [pin(62) of IC2302(SUB_MICON)] at H?
Is audio signal sent to pins (22/L-ch) and (21/R-ch) of
IC3001(MAIN_MICON)?
Check IC3001 and its peripheral circuits.
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)?
Is the audio signal output to pin(2/L-ch) pin(3/R-ch) of
headphone terminal J1003?
Is the audio signal input into pin (3) and (1) of connector
SC1001 from pin(3/L-ch),(1/R-ch) of connector P1001?
Is HP-MUTE-LINE [pin(40) of IC2302(SUB_MICON)] at
H?
Is audio signal sent to pins (26/L-ch) and (25/R-ch) of
IC3001(MAIN_MICON)?
Check IC3001 and its peripheral circuits.
The audio signal is not output (3)
NO
NO
NO
NO
The audio signal is not output (6)
YES
NO
NO
NO
NO
YES
Check the connection to J1304 and external devices.
YES
Check the peripheral circuits of IC2302 and S-MUTE_LINE.
(Q1303, etc.)
YES
Check the line between J1304 and IC3001.
(Q1302, Q1301, etc.)
NO
Check the line between J1003 and IC3001.
(SC1001/P1001, IC3001, etc.)
YES
Check HEAD-PHONE (J1003) or peripheral circuits.
YES
Check the line between P1001 and J1003.
(SC1001/P1001, etc.)
YES
Check the peripheral circuits of IC2302 and HP-MUTE_LINE.
(Q1001, etc.)
YES
Check the line between P1001 and IC3001.
(IC1102, etc.)
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