Sharp LC-37SD1E Service Manual page 45

No sound from external input devices (2)
No sound from EXT5 (AUDIO) connecting an external input
device.
<EXT5>
Is HDMI-L audio signal sent from J2701 to pin (14) of IC2704?
Is HDMI-R audio signal sent from J2701 to pin (5) of IC2704?
Is HDMI-L audio signal sent to pin (10) of IC3002?
Is HDMI-R audio signal sent to pin (9) of IC3002?
Check that Option-HDMI Setup-Audio select is set to "Analog".
Is the audio signal properly sent from pins (28) and (27) of
IC3002?
Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent
properly?
Is the audio output signal of pins (13) and (16) of IC302/IC301
(MAIN-AMP) normal?
Check CONNECTOR (P301) and Speaker (right and left).
No sound except from speakers (3)
No audio output from the headphones.
Is there audio output on pins (2) and (3) of the headphone
terminal (J1301)?
Is audio input/output signal of pins (3) and (5)/(1) and (7) of IC303
(OP-AMP) normal?
Is audio output signal (SPK-OUT L/R) properly sent from pins
(28) and (27) of IC3002 (VCT)?
Check audio input signal of pin (31) of IC3002 (VCT), pins (18)
and (33) of the power line, pins (84) and (83) of I2C-LINE, and
peripheral circuits.
YES
YES
OK
YES
YES
YES
NO
NO
NO
NO Check output of pins (13) and (3) of IC2704 and peripheral
circuits.
NO Check IC3002 or peripheral circuits.
NO Check IC303 or peripheral circuits.
NO Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral
circuits.
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LC-37SA1E/RU