Service manual

LC-40/46/52/60LE810UN (1st Edition)
6 – 7
No audio (1)
INPUT-1 No audio. INPUT-2 No audio.
Is INPUT-1 selected on the input select menu screen? Is INPUT-2 selected on the input select menu screen?
YES
NO
YES
NO
Refer to “: No external input video [INPUT-1]”. Refer to “: No external input video [INPUT-2]”.
Is the audio output selected for “VARIABLE” on the menu screen? Is the audio output selected for “VARIABLE” on the menu screen?
YES
NO
YES
NO
Set the audio output to “FIXED”. Set the audio output to “FIXED”.
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)?
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
YES
NO
Check the line between J507 and IC3302. Check the line between J505 and IC3302.
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)?
YES
NO
Check the line between IC3302 and IC2701,
and their peripheral circuits.
• 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)?
NO Check IC2701 and its peripheral circuits. (X2701, etc.).
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?
NO • About the L/R Speakers.
Check IC2703 and its peripheral circuits.
• About the Subwoofer Speaker.
Check IC2702 and its peripheral circuits.
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.