LC
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52DH77E/RU/S
4 – 3
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?
Is IF signal output from pins (16, 17) of TU1101?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Is IF signal sent to pin (AA29/D__IF_P, AB29/D__IF_N) of
IC3302 (Digital AV decode & Main CPU)?
NO
Check the line between TU1101 and IC3302.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (1)
Does not the sound of the audio signal input to EXT1/EXT2 go out?
Is there a audio input signal in pins (6/SC1_IN_L) and (2/
SC1_IN_R) of EXT1 (SC503)?
NO
Check the setting of an external input device that connects with
EXT1.
Is there a audio input signal in pins (6/SC2_IN_L) and (2/
SC2_IN_R) of EXT2 (SC502)?
NO
Check the setting of an external input device that connects with
EXT2.
YES
Is there a audio input signal in pins (V28/SC1_L) and (V27/
SC1_R) of IC3302 (Digital AV decode & Main CPU) from SC503?
NO
Check the line between SC503 and IC3302.
Is there a audio input signal in pins (U27/SC2_L) and (U26/
SC2_R) of IC3302 (Digital AV decode & Main CPU) from SC502?
NO
Check the line between SC502 and IC3302.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (2)
Does not the sound of the audio signal input to EXT3 go out?
Is there a audio input signal in pins (2/COMP_IN_L) and (4/
COMP_IN_R) of EXT3 (J502)?
NO
Check the setting of an external input device that connects with
EXT3.
YES
Is there a audio input signal in pins (U29/COMP_L) and (U28/
COMP_R) of IC3302 (Digital AV decode & Main CPU) from
J502?
NO
Check the line between J502 and IC3302.
YES
Refer to “No sound output in all modes”.
Summary of Contents for LC-52DH77E/RU/S
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