Sharp AQUOS LC-42LE40E, Service Manual

Page: 42 / 157

LC-32LE40E-LC-42LE40E
42
No sound (during the reception of TV 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 SCART go out?
TEREMINAL UNIT:
↓
↓ YES
↓ YES
↓ YES
No sound from external input devices (2)
↓
Does not the sound of the audio signal input to Component go out?
MAIN UNIT:
↓
↓ YES
↓ YES
↓ YES
Is the DIF signal output from pin (13/14) of Tuner (TU101)?
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 (2)(YPbPr_L_In) and pin
(4)(YPbPr_R_In) of CN116?
NO
Check the connection to CN116 and the external input device.
Refer to “ No sound output in all modes ” .
Is the audio signal properly sent to pin5 (YPbPr_LIn) and pin14
(YPbPr_RIn) of IC U605?
NO
Check the line between CN116 and IC U605.
Is the DIF signal sent to pin (184/185) of IC U401?
NO
Check IC U401 its peripheral circuits.
Is the audio signal properly sent to pin 6 (SCT1_AUL_IN) and pin2
(SCT1_AUR_IN) of SCART (CN151)?
NO
Check the setting of an external input device that connects of
CN151.
Refer to “ No sound output in all modes ” .
Is the audio signal properly sent to pin (2&15) of IC U605?
NO
Check the line between CN151 and IC U605.
Is the audio signal properly sent to pin IC U401?
NO
Check the line between U605 and IC U401.
Is the audio signal properly sent to IC U401?
NO
Check the line between U605 and IC U401.