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LC-46D65E/RU
4 – 4
The audio signal is not output (1)
No audio signal output from EXT1/EXT2 terminal.
Is there a audio output signal in pins (3/L-ch) and (1/R-ch) of
EXT1 (SC502)?
EXT1 (SC502)?
YES
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is there a audio output signal in pins (3/L-ch) and (1/R-ch) of
EXT2 (SC501)?
EXT2 (SC501)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
<EXT1>
Is SC-MUTE [pin (67) of IC9101 (CPLD)] at H?
Is SC-MUTE [pin (67) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and SC-MUTE.
(Q503, Q505, etc.)
(Q503, Q505, etc.)
<EXT2>
Is SC2-MUTE [pin (65) of IC9101 (CPLD)] at H?
Is SC2-MUTE [pin (65) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and SC2-MUTE.
(Q502, Q504, etc.)
(Q502, Q504, etc.)
NO
<EXT1>
Is there a audio output signal in pins (39/SC1_OUT_L) and (38/
SC1_OUT_R) of IC503(AV_SW)?
Is there a audio output signal in pins (39/SC1_OUT_L) and (38/
SC1_OUT_R) of IC503(AV_SW)?
YES
Check the line between IC503 and SC502.
<EXT2>
Is there a audio output signal in pins (37/SC2_OUT_L) and (36/
SC2_OUT_R) of IC503 (AV_SW)?
Is there a audio output signal in pins (37/SC2_OUT_L) and (36/
SC2_OUT_R) of IC503 (AV_SW)?
YES
Check the line between IC503 and SC501.
NO
Check IC503 and its peripheral circuits.
The audio signal is not output (2)
No audio signal output from AUDIO_OUTPUT terminal.
Is audio signal (L/R) output to pins (2, 4) of AUDIO_OUTPUT ter-
minal (J503)?
minal (J503)?
YES
Check the connection to AUDIO_OUTPUT terminal and external
input devices.
input devices.
NO
MONITOR_MUTE signal [Pin (23) of IC503 (AV_SW.)] or MUTE-
A_ALL signal [Pin (21) of IC2003] will be “H”?
A_ALL signal [Pin (21) of IC2003] will be “H”?
YES
Check the peripheral circuits of IC503 and MUTE-A_ALL_LINE.
(D534, etc.)
(D534, etc.)
NO
Is audio signal (L/R) output to pins (5, 6) of IC1302 (DSP)?
YES
Check the line between IC1302 and J503.
(Q510, Q511, Q512, Q513, etc.)
(Q510, Q511, Q512, Q513, etc.)
NO
Check IC1302 and its peripheral circuits.
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