Sharp LC-26SH330, Service Manual

Page: 62 / 223

LC-26SH330, LC-32SH330, LC-42SH330
62
The audio signal is not output (3)
↓
No audio signal output from LINE_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓ NO
↓ NO
The audio signal is not output (4)
↓
No audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
↓ NO
The audio signal is not output (5)
↓
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
↓
↓ YES
↓ YES
↓ YES
Is audio signal output from IC U401 is sent to pin (2)(1IN-) and pin
(6)(2IN-)of IC U107?
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)?
YES
Check the connection to LINE_AUDIO_OUT and external
devices.
YES
Check the line between IC U401 and IC U107.
Check IC U401 and its peripheral circuits.
Check IC U401 and its peripheral circuits.
Is ASPDIF audio signal output from pin (K33) of IC U401 to pin
(2) of connector CN603? YES Check the connection to SPDIF_OUT and external devices.
Is the audio signal output from IC U602 to pin(2) (HPOUTL) and
pin (3) (HPOUTR) of headphone terminal CN602?
Is the HP_DET# signal input into pin (AE6) of IC U401 from pin
(6) of a headphone terminal (CN602)?
NO
Check the connection to CN602 and external headphone is
plug in well.
NO
Check the line between IC U602 and CN602.
Check IC U401 and its peripheral circuits.
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?
NO Check the line between IC U401 and IC U602.