Read Sharp LC-32SD1E (serv.man8) Service Manual online
LC-26SD1E/RU, LC-32SD1E/RU
6 – 4
No sound from external input devices (2)
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 IC3002?
Is IN3-R audio signal sent from pin (5) of J1201 terminal to pin
(15) of IC3002?
NO
Check pins (3) (J1201) and (5) (J1201) of EXT3 and connection
to an external input device.
to an external input device.
YES
Is the audio signal properly sent from pins (28) and (27) of
IC3002?
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent
properly?
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301
(MAIN-AMP) normal?
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral
circuits.
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
No sound from external input devices (2)
No sound from EXT4 (AUDIO) connecting an external input
device.
<EXT4>
Is D-SUB-L audio signal sent from J2702 to pin (15) of IC2704?
Is D-SUB-R audio signal sent from J2702 to pin (2) of IC2704?
YES
Is D-SUB-L audio signal sent to pin (10) of IC3002?
Is D-SUB-R audio signal sent to pin (9) of IC3002?
Is D-SUB-R audio signal sent to pin (9) of IC3002?
YES
Is the audio signal properly sent from pins (28) and (27) of
IC3002?
IC3002?
NO
Check IC3002 or peripheral circuits.
YES
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent
properly?
properly?
NO
Check IC303 or peripheral circuits.
YES
Is the audio output signal of pins (13) and (16) of IC302/IC301
(MAIN-AMP) normal?
(MAIN-AMP) normal?
NO
Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral
circuits.
circuits.
YES
Check CONNECTOR (P301) and Speaker (right and left).
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