Sharp LC-22LE320 Service Manual page 108

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
No audio signal output from LINE_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:
Is audio signal output from IC U107 sent to pin(4)
(Audio_Line_Out_L) and pin (6) (Audio_Line_Out_R) of
LINE_AUDIO_OUT connector(CN140)?
Is audio signal output from IC U401 is sent to pin (2)(1IN-) and pin
(6)(2IN-)of IC U107?
Check IC U401 and its peripheral circuits.
No audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
Is ASPDIF audio signal output from pin (K33) of IC U401 to pin (2)
of connector CN603?
Check IC U401 and its peripheral circuits.
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
Is the HP_DET# signal input into pin (AE6) of IC U401 from pin (6)
of a headphone terminal (CN602)?
Is the audio signal output from IC U602 to pin(2) (HPOUTL) and pin
(3) (HPOUTR) of headphone terminal CN602?
Is the audio signal output from IC U401 pin(V35) and pin(U34) sent
to pin(1)(INL-) and pin(4)(INR-) of IC U602?
Check IC U401 and its peripheral circuits.
The audio signal is not output (3)
↓
↓
↓NO
↓NO
The audio signal is not output (4)
↓
↓NO
The audio signal is not output (5)
↓
↓
↓YES
↓YES
↓YES
YES Check the connection to LINE_AUDIO_OUT and external
devices.
YES
Check the line between IC U401 and IC U107.
YES
Check the connection to SPDIF_OUT and external devices.
NO Check the connection to CN602 and external headphone is plug
in well.
NO
Check the line between IC U602 and CN602.
NO
Check the line between IC U401 and IC U602.
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