Sharp LC-60LE810UN Service Manual page 61

INPUT-1 No audio.
Is INPUT-1 selected on the input select menu screen?
NO
Refer to ": No external input video [INPUT-1]".
YES
Is the audio output selected for "VARIABLE" on the menu screen?
NO
Set the audio output to "FIXED".
YES
Does the audio signal come from pins (4) (L) and (3) (R) of input
terminal (J507) to pins (U29)(L) and (U28) (R) of IC3302 (CPU)?
NO
Check the line between J507 and IC3302.
YES
Does the digital audio signal come from pins (F28/F30/G28) (AUBCK/AULRCK/AOSDATA0) of
IC3302 (CPU) to pin (8/9/7) (SP_BCLK/SP_LRCLK/SP_DATA) of IC2701 (Audio DSP)?
NO
Check the line between IC3302 and IC2701,
and their peripheral 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 cir-
cuits.
• About the Subwoofer Speaker.
Check the connector (P2702), subwoofer speaker and their periph-
eral.
LC-40/46/52/60LE810UN (1st Edition)
No audio (1)
Is INPUT-2 selected on the input select menu screen?
YES
Is the audio output selected for "VARIABLE" on the menu screen?
YES
Does the audio signal come from pins (4) (L) and (1) (R) of input
terminal (J505) to pins (R28) (L) and (T26) (R) of IC3302 (CPU)?
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 – 7
INPUT-2 No audio.
NO
Refer to ": No external input video [INPUT-2]".
NO
Set the audio output to "FIXED".
NO
Check the line between J505 and IC3302.