Sharp LC-19S7E-BK Service Manual page 32

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK
No audio signal output from LINE_AUDIO_OUTPUT terminal.
↓
TEREMINAL UNIT:
Is audio signal output from IC U1201 sent to pin(4)(AUD_LOUT)
and pin (6)(AUD_ROUT) of connector(CN1205)?
Is the audio signal output from IC U4201 pin(80) (LINEOUTL) and
pin(81) (LINEOUTR) sent to pin(13)(INL) and pin(15)(INR) of IC
U1201?
Check IC U4201 and its peripheral circuits.
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
Is the HP_DET signal input into pin (93) of IC U4201 from pin (5) of
a headphone terminal (CN1204)?
Is the audio signal output from IC U6103 to pin(2) (HPL) and pin (3)
(HPR) of headphone terminal CN1204?
Is the audio signal output from IC U4201 pin (84)(DACOUTL0) and
pin(85) (DACOUTR0) sent to pin(15)(INR) and pin(13)(INL) of IC
U6103?
Check IC U4201 and its peripheral circuits.
The audio signal is not output (2)
↓
↓NO
↓NO
The audio signal is not output (3)
↓
↓
↓YES
↓YES
↓YES
YES Check the connection to CN1205 and external devices.
YES
Check the line between IC U4201 and IC U1201.
NO Check the connection to CN1204 and external headphone is
plug in well.
NO
Check the line between IC U6103 and CN1204.
NO Check the line between IC U4201 and IC U6103.
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