Sharp AQUOS LC-42SB45U, Service Manual

Page: 35 / 110

2008-03-14
LC-42SB45U
35
No sound from external input devices (2)
↓
Does not the sound of the audio signal input to INPUT 3(Composite, Y/C) go out?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (3)
↓
Does not the sound of the audio signal input to INPUT 7 (VGA) go out?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (4)
↓
Does not the sound of the audio signal input to INPUT 4/5/6 (HDMI1/2/3) go out?
↓
↓ YES
The digital audio signal is not output (1)
↓
No digital audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓ NO
Is the audio signal properly sent to pin (4) (AV3_AudioLIN) and pin
(6) (AV3_AudioRIN) of CN650?
NO
Check the connection to CN650 and the external input device.
Refer to
“
No sound output in all modes
”
.
Is the audio signal properly sent to pin (K23) (AV3_LIN) and pin
(K24) (AV3_RIN) of IC U400? NO Check the line between CN650 and IC U400.
Is the audio signal properly sent to pin (2) (VGA_AudioLIN) and pin
(3) (VGA_AudioRIN) of CN555?
NO
Check the connection to CN555 and the external input device.
Refer to
“
No sound output in all modes
”
.
Is the audio signal properly sent to pin (K25) (VGA_LIN) and pin
(K26) (VGA_RIN) of IC U400?
NO
Check the line between CN555 and IC U400.
Refer to
“
No sound output in all modes
”
.
Is picture of the signal input from INPUT 4/5/6 displayed? NO Refer to
“
Does not the picture of the HDMI signal input to
HDMI1/2/3 go out?
”
.
Check IC U400 and its peripheral circuits.
Is ASPDIF audio signal output from pin (B22) of IC U400 to pin (6)
of connector CN553?
YES
Check the connection to SPDIF_OUT and external devices.