Sharp AQUOS LC-42LE40E, Service Manual

Page: 44 / 157

LC-32LE40E-LC-42LE40E
44
The audio signal is not output (1)
↓
The audio signal of UHF/VHF is not output from SCART.
TEREMINAL UNIT:
↓
↓ NO
↓ NO
The audio signal is not output (2)
↓
The audio signal of UHF/VHF is not output from audio line output terminal.
TEREMINAL UNIT:
↓
↓ NO
↓ NO
The audio signal is not output (3)
↓
No audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓ NO
The audio signal is not output (4)
↓
No sound from HEADPHONE_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓ YES
↓ YES
↓ YES
Is audio signal output from IC U603 sent to pin (3)
(SCT1_AUL_OUT) and pin(1)(SCT1_AUR_OUT) of
SCART(CN151)?
YES
Check the connection to SCART1 and external devices.
Check IC U401 and its peripheral circuits.
Is audio signal output from IC U401 is sent to pin (2) (1IN-) and pin
(6) (2IN-)of IC U603? YES Check the line between IC U401 and IC U603.
Is audio signal output from IC U601 sent to pin
(4)(SCT2_AUL_OUT) and pin(6)(SCT2_AUR_OUT) of
SCART2(CN152)?
YES
Check the connection to AV output and external devices.
Check IC U401 and its peripheral circuits.
Is audio signal output from IC U401 is sent to IC U601?
YES
Check the line between IC U401 and IC U601.
Is ASPDIF audio signal output from pin (206) of IC U401 to pin (2)
of connector CN117?
YES
Check the connection to SPDIF_OUT and external devices.
Check IC U401 and its peripheral circuits.
Is the HP_DET# signal input into pin (253) of IC U401 from pin (6)
of a headphone terminal (CN602)?
NO
Check the connection to CN602 and external headphone is plug
in well.
Check IC U401 and its peripheral circuits.
Is the audio signal output from IC U602 to pin (2) (HPOUTL) and
pin (3) (HPOUTR) of headphone terminal CN602?
NO
Check the line between IC U602 and CN602.
Is the audio signal output from IC U401 pin (201) and pin (203)
sent to pin (1)(HPL IN) and pin(4)(HPR IN) of IC U602?
NO
Check the line between IC U401 and IC U602.