LC-46SB57U/LC-52SB57U
6 – 8
No audio (1)-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 (5) (L) and (7) (R) of input
terminal (J507) to pins (V30)(L) and (V29) (R) of IC8001 (CPU)?
Does the audio signal come from pins (4) (L) and (2) (R) of input
terminal (J503) to pins (U29) (L) and (U28) (R) of IC8001 (CPU)?
YES
NO
YES
NO
Check the line between J507 and IC8001. Check the line between J503 and IC8001.
Does the audio signal come from pins (N29/N30) (PGA0OUT_L/R) of IC8001 (CPU) to pins (4/7)
(INLP/INRP) of IC2701 (AMP)?
YES
NO
Check the line between IC8001 and IC2701,
and their peripheral circuits (Q1306/Q1307,
AMP_MUTE line, etc.).
Is the audio output from IC2701 as specified? NO Check IC2701 and its peripheral circuits.
YES
Check the connector (P2701), speakers and their peripheral cir-
cuits.
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