Sharp LC-60LE831U Service Manual page 79

• Does not sound.
INPUT-6 No audio.
Is INPUT-6 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-6]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (8)
(L) and (7) (R) of input terminal (J510) to
pins (AL30)(L) and (AL32) (R) of IC3303
(CPU)?
NO
Check the line between J510
and IC3303.
YES
Does the digital audio signal come from pins (Y31/Y30/V27) (CPU_AOBK/AOLRCK/AOSDATA0) of IC3303 (CPU) to pin (8/9/7) (SP_BCLK/
SP_LRCLK/SP_DATA) of IC2701 (Audio DSP)?
NO
Check the line between IC3303
and IC2701, and their periph-
eral circuits.
YES
• About the L/R Speakers.
Does the digital audio signal come from pins (47/43/
44/45) of IC2701 (Audio DSP) to pin (5/8/7/6) of
IC2703 (AMP for L/R)?
• About the Subwoofer speaker.
Does the digital audio signal come from pins (47/43/
44/46) of IC2701 (Audio DSP) to pin (5/8/7/6) of
IC2702 (AMP for SW)?
YES
• About the L/R Speakers.
Is the audio output from IC2703 as specified?
• About the Subwoofer Speaker.
IS the audio output from IC2702 as specified?
YES
• About the L/R Speakers.
Check the connector (P2701) L/R speakers and their
peripheral circuits.
• About the Subwoofer Speaker.
Check the connector (P2702), subwoofer speaker
and their peripheral.
LC-40/46/52/60LE835U/830U/832U/LC-60LE831U
No audio (1)
INPUT-7 No audio.
Is INPUT-7 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-7]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (3)
(L) and (2) (R) of input terminal (J510) to
pins (AL27)(L) and (AK28) (R) of IC3303
(CPU)?
NO
Check the line between J510
and IC3303.
YES
NO Check IC2701 and its peripheral circuits.
(X2701, etc.).
• About the L/R Speakers.
NO
Check IC2703 and its peripheral circuits.
• About the Subwoofer Speaker.
Check IC2702 and its peripheral circuits.
6 – 15
INPUT-5 No audio.
Is INPUT-5 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-5]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (13)
(L) and (12) (R) of input terminal (J510) to
pins (AK27)(L) and (AK29) (R) of IC3303
(CPU)?
NO
Check the line between J510
and IC3303.
YES