Sharp LC-32DH57E-BK Service Manual page 34

LC-32DH57E-BK/RU-BK/S-BK
No sound from EXT3 (COMP-A-IN) connecting an external input
device.
<EXT3>
Is COMP_IN_L audio signal input to pin (2) of EXT3_AUDIO
(J502)?
Is COMP_IN_R audio signal input to pin (4) of EXT3_AUDIO
(J502)?
Is COMP_IN_L audio signal input to pin (48) of IC1302 (A-SW)?
Is COMP_IN_R audio signal input to pin (47) 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 (H25) of IC3303 (VCT)?
It is the same as the above-mentioned A-BLOCK.
No sound from EXT4 (PC/HDMI-A-IN) connecting an external
input device.
<EXT4>
Is PC/HDMI-L audio signal input to pin (2) of EXT4 (J501)?
Is PC/HDMI-R audio signal input to pin (3) of EXT4 (J501)?
Is PC/HDMI-L audio signal input to pin (50) of IC1302 (A-SW)?
Is PC/HDMI-R audio signal input to pin (49) 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 (H25) of IC3303 (VCT)?
It is the same as the above-mentioned A-BLOCK.
No sound from external input devices (2-2)-1
YES
YES
YES
YES
No sound from external input devices (2-2) -2
YES
YES
YES
YES
NO Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal pin (28) (27) 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 S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal pin (28) (27) 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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