Read Sharp LC-46DH77E (serv.man5) Service Manual online
LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V
4 – 2
No sound (during the reception of TV (DIGITAL) broadcasting)
Does not the sound go out though the picture has come out when DTV (H.264) is received?
Is H.264_I2S signal output from pin (D26/H.264_I2S_MCLK),
(E24/H.264_I2S_SCLK), (E26/H.264_I2S_LRCLK) and (A25/
H.264_I2S_DATA) of IC5001 (H.264_DECODER)?
NO
Check IC5001 and its peripheral circuits.
YES
Is H.264_I2S signal input to pin (13/H.264_I2S_MCLK), (3/
H.264_I2S_SCLK), (6/H.264_I2S_LRCLK) and (10/
H.264_I2S_DATA) of IC1306 (SW.)?
H.264_I2S_SCLK), (6/H.264_I2S_LRCLK) and (10/
H.264_I2S_DATA) of IC1306 (SW.)?
NO
Check the line between IC5001 and IC1306.
YES
Is DIG_I2S signal input to pin (82/DTV_SCK), (83/DTV_WS)
and (84/DTV_SDO) of IC1302 (DSP)?
and (84/DTV_SDO) of IC1302 (DSP)?
NO
Check the line between IC1306 and IC1302.
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/IN1L) and (2/IN1R) of
EXT1 (SC502)?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is there a audio input signal in pins (6/IN2L) and (2/IN2R) of
EXT2 (SC501)?
EXT2 (SC501)?
NO
Check the setting of an external input device that connects with
EXT2.
EXT2.
YES
EXT1
Is the audio signal input to pins(9/AIN1_L) and (10/AIN1_R) of
IC1302 (DSP)?
Is the audio signal input to pins(9/AIN1_L) and (10/AIN1_R) of
IC1302 (DSP)?
NO
Check the line between SC502 and IC1302.
EXT2
Is the audio signal input to pins (13/AIN2_L) and (14/AIN2_R) of
IC1302 (DSP)?
Is the audio signal input to pins (13/AIN2_L) and (14/AIN2_R) of
IC1302 (DSP)?
NO
Check the line between SC501 and IC1302.
YES
Refer to “No sound output in all modes”.
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