Sharp LC-19D1E/S-BK/WH, Service Manual

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LC-19D1E/S-BK/WH
4 – 7
No sound from external input devices (3)-1
No sound from EXT1 (SCART) connecting an external input
device.
<EXT1>
Is SCART-L-IN audio signal input from pin (6) of SCART1 termi-
nal (SC501) to pin (14) of IC501 (AV-SW)?
Is SCART-R-IN audio signal input from pin (2) of SCART1 termi-
nal (SC501) to pin (15) of IC501?
NO
Check pins (6) and (2) of SCART1 and connection to an external
input device.
YES
Is the audio signal (TERMINAL-L/R) properly output from pins
(34) and (33) of IC501 (AV-SW)? NO Check the Power supply input of pin(38) of IC501, or SDA2/SCL2
signal of pins (28) and (29) or peripheral circuits.
YES
Is the audio signal (LOUT2/ROUT2) output properly from pins
(25) and (23) of IC302 (A-CODEC) ? NO Check pins (1) and (4) of IC302 (A-CODEC) , pins (11) and (12)
of Connector SC1202, audio-mute line (Q301/Q302) or periph-
eral circuits.
YES
Is the audio signal L-CH output to pins (44-45) and (40-41) of
IC303 (POWER-AMP)? Is the audio signal R-CH output to pins
(20-21) and (16-17) of IC303 (POWER-AMP) normally ? NO Check UR12V power supply input pins (47) and (14) of IC303
(POWER-AMP) or peripheral circuits.
YES
Is the audio signal of pins (1)-(4) of SP-Connector (P301) prop-
erly output? NO Check SP-CONNECTOR (P301) and short circuit.
YES
Check SP-BOX (right and left) and WIRE HARNESS.