Sharp LC-32DH57E-BK Service Manual page 33

No sound from EXT1 (SCART1) connecting an external input
device.
<EXT1>
Is the SC1_IN_L (SCART1-L-IN) audio signal input from pin (6)
of SCART1 terminal (SC503) to pin (44) of IC1302 (A-SW)?
Is the SC1_IN_R (SCART1-R-IN) audio signal input from pin (2)
of SCART1 terminal (SC503) to pin (43) of IC1302 (A-SW)?
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H24) of IC3303 (VCT)?
It is the same as the above-mentioned A-BLOCK.
No sound from EXT2 (SCART2) connecting an external input
device.
<EXT2>
Is the SC2_IN_L (SCART2-L-IN) audio signal input from pin (6)
of SCART2 terminal (SC502) to pin (46) of IC1302 (A-SW)?
Is the SC2_IN_R (SCART2-R-IN) audio signal input from pin (2)
of SCART2 terminal (SC502) to pin (45) of IC1302 (A-SW)?
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H24) of IC3303 (VCT)?
It is the same as the above-mentioned A-BLOCK.
No sound from external input devices (2-1)-1
YES
YES
YES
No sound from external input devices (2-1)-2
YES
YES
YES
NO Check pins (6) (2) of SCART1 and connection of an external
input device.
NO Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
NO Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
NO Check pins (6) (2) of SCART2 and connection of an external
input device.
NO Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal (28) (27) pin of IC1302 (A-SW)
or the peripheral circuit.
NO Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
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LC-32DH57E-BK/RU-BK/S-BK