Sharp LC-42SV32B, Руководство по обслуживанию

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LC-42SV32B
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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 Component go out?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (2)
↓
Does not the sound of the audio signal input to (Composite, Y/C) go out?
MAIN UNIT:
↓
↓ YES
↓ YES
Is the IF signal output from pin (1/2/4/5) 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 (8)(YPbPr_L_In) and pin
(11)(YPbPr_R_In) of CN111?
NO
Check the connection to CN111 and the external input device.
Refer to
“
No sound output in all modes
”
.
Is the audio signal properly sent to pin (AC20) (YPbPr_L_In) and
pin (AE23) (YPbPr_R_In) of IC U401?
NO
Check the line between CN111 and IC U401.
Is the audio signal properly sent to pin (4) (SIDE_AudioLIN) and pin
(7) (SIDE_AudioRIN) of CN128?
NO
Check the connection to CN128 and the external input device.
Refer to “ No sound output in all modes ” .
Is the audio signal properly sent to pin (AC21) (AV2_L_In) and pin
(AE24) (AV2_R_In) of IC U401? NO Check the line between CN128 and IC U401.
Is the IF signal sent to pin (AD17/AE17) of IC U401?
NO
Check IC U401 its peripheral circuits.