Sharp LC-26SH330, Service Manual

Page: 72 / 223

LC-26SH330, LC-32SH330, LC-42SH330
72
No sound (during the reception of TV (DIGITAL) broadcasting)
↓
Does not the sound go out though the picture has come out when TV is received?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (1)
↓
Does not the sound of the audio signal input to SCART1 go out?
TEREMINAL UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (2)
↓
Does not the sound of the audio signal input to SCART2 go out?
TEREMINAL UNIT:
↓
↓ YES
↓ YES
Is the IF signal output from pin (16) and pin (17) of TUNER
(TU102)?
NO
Check the tuner and its peripheral circuits. Replace as
required.
Refer to
“
No sound output in all modes
”
.
Is the audio signal properly sent to pin (6) (SCT1_AUL_IN) and
pin (2) (SCT1_AUR_IN) of SCART1 (CN151)? Check the setting of an external input device that connects of
CN151 NO
Is the audio signal properly sent to pin (AA32) and pin (AB33) of
IC U401?
NO
Check the line between CN151 and IC U401
Refer to
“
No sound output in all modes
”
.
Is the IF signal sent to pin (AH35) and pin (AH37) of IC U401?
NO
Check IC U401 its peripheral circuits.
Is the audio signal properly sent to pin (6) (SCT2_AUL_IN) and
pin (2) (SCT2 AUR IN) of SCART2 (CN152)? Check the setting of an external input device that connects of
CN152
NO
Is the audio signal properly sent to pin (AC36) and pin (AB37) of
IC U401?
NO
Check the line between CN152 and IC U401
Refer to
“
No sound output in all modes
”
.