LC-42SB45U
34
↓YES
No sound (during the reception of TV(ANALOG) broadcasting)
↓
Does not the sound go out though the picture has come out when UHF/VHF is received?
TEREMINAL UNIT: ↓
↓YES
↓YES
No sound (during the reception of TV (DIGITAL) broadcasting)
↓
Does not the sound go out though the picture has come out when DTV is received?
MAIN UNIT: ↓
↓YES
↓YES
No sound from external input devices (1)
↓
Does not the sound of the audio signal input to INPUT 1(Component) go out?
Does not the sound of the audio signal input to INPUT 2(Component) go out?
MAIN UNIT:
↓
↓YES
↓YES
Is the audio signal output of pin (2, 1) (L-ch) and pin (1, 2) (R-ch) of
CN604 & CN605(AOUDIO-CONNECTOR) normal?
NO
Check IC U600 and its peripheral circuits.
Check Speaker (right and left) and wire harness.
Is the SIF signal output from pin (3) of TUNER (TU201)?
Is the SIF signal sent to pin (P25) and pin (P26) of IC U400?
NO
Check the tuner and its peripheral circuits. Replace as required.
NO
Check IC U400 its peripheral circuits.
Refer to “No sound output in all modes”.
Is the DIF signal output from pin (18) and pin (19) of TUNER
(TU201)?
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) (AV1_AudioLIN) and pin
(4)(AV1_AudioRIN) of CN552?
NO
Check the connection to CN552 and the external input device.
Refer to “No sound output in all modes”.
Is the audio signal properly sent to pin (J23) (AV1_LIN) and pin
(J24) (AV1_RIN) of IC U400?
NO
Check the line between CN552 and IC U400.
Is the DIF signal sent to pin (AB24) and pin (AC24) of IC U400?
NO
Check IC U400 its peripheral circuits.
Is the audio signal properly sent to pin (2) (AV2_AudioLIN) and pin
(4)(AV2_AudioRIN) of CN551?
Check the connection to CN551 and the external input device.
Is the audio signal properly sent to pin (J25) (AV2_LIN) and pin
(J26) (AV2_RIN) of IC U400?
Check the line between CN551 and IC U400.
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