No Sound From External Input Devices - Sharp LC-32A28L Service Manual

↓
Does not the sound of the audio signal input to input2(Component) go out?
Does not the sound of the audio signal input to input3(Component) go out?
↓
MAIN UNIT:
Is the audio signal properly sent to pin (8) (YPBPR_L_IN2) and pin
(11)( YPBPR_R_IN2) of CN103?
Is the audio signal properly sent to pin (8) (YPBPR_L_IN1) and pin
(11)( YPBPR_R_IN1) of CN104?
↓YES
Is the audio signal properly sent to pin (99) (AIN4_L) and pin (97)
(AIN4_R) of IC U401?
Is the audio signal properly sent to pin (98) (AIN3_L) and pin (96)
(AIN3_R) of IC U401?
↓YES
Refer to "No sound output in all modes".
↓
Does not the sound of the audio signal input to input1 (Composite) go out?
↓
MAIN UNIT:
Is the audio signal properly sent to pin (4) (AV2_AudioLIN) and pin
(7) (AV2_AudioRIN) of CN105?
↓YES
Is the audio signal properly sent to pin (103) (AIN6_L) and pin (101)
(AIN6_R) of IC U401?
↓YES
Refer to "No sound output in all modes".
↓
Does not the sound of the audio signal input to VGA go out?
↓
MAIN UNIT:
Is the audio signal properly sent to pin (2) (VGA_LIN) and pin (3)
(VGA_RIN) of CN102?
↓YES
Is the audio signal properly sent to pin (102) (AIN5_L) and pin (100)
(AIN5_R) of IC U401?
Refer to "No sound output in all modes".

No sound from external input devices (1)

No sound from external input devices (2)
No sound from external input devices (3)
↓YES
2008-03-14
NO
Check the connection to CN103 and the external input device.
NO Check the connection to CN104 and the external input device.
NO Check the line between CN103 and IC U401.
Check the line between CN104 and IC U401.
NO
Check the connection to CN105 and the external input device.
NO
Check the line between CN105 and IC U401.
NO
Check the connection to CN102 and the external input device.
NO
Check the line between CN102 and IC U401.
31
LC-32A28L, LC-42A48L