Read Sharp LC-32DH66E (serv.man4) Service Manual online
LC-32D65E/RU, LC-37D65E/RU
4 – 4
<LC-32D65E/RU, LC-37D65E/RU>
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.
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