LC-52/60/70LE640U,C6400U (1st Edition)
6 – 18
No audio (4)
INPUT-1 No audio (HDMI connected)
INPUT-2 No audio (HDMI connected)
INPUT-3 No audio (HDMI connected)
INPUT-4 No audio (HDMI connected)
[INPUT-1 input]
Is INPUT-1 selected on the input select menu screen?
[INPUT-2 input]
Is INPUT-2 selected on the input select menu screen?
[INPUT-3 input]
Is INPUT-3 selected on the input select menu screen?
[INPUT-4 input]
Is INPUT-4 selected on the input select menu screen?
YES
NO
Refer to “: No external input video [INPUT-1/2/3/4]”.
[INPUT-1 input]
If no video appears, refer to “No external input video (HDMI) [INPUT-1]”.
[INPUT-2 input]
If no video appears, refer to “No external input video (HDMI) [INPUT-2]”.
[INPUT-3 input]
If no video appears, refer to “No external input video (HDMI) [INPUT-3]”.
[INPUT-4 input]
If no video appears, refer to “No external input video (HDMI) [INPUT-4]”.
Is the audio output selected for “VARIABLE” on the menu screen?
YES
NO
Set the audio output to “FIXED”.
Does the digital audio signal come from pins (Y32/Y31/Y30/V27) (CPU_AOMCLK/AOBCK/AOLRCK/AOSDATA0) of IC3303 (CPU) to pins (5/7/8/6)
(AMP_MCLK/BCLK/LRCLK/DATA_LR) of IC2703 (AMP for L/R)?
YES
NO
Check the line between IC3303 and IC2703 and their peripheral circuits.
Is the audio output from IC2703 as specified?
NO
Check IC2703 and their peripheral circuits.
YES
Check the connector (P2701) L/R speakers and their peripheral
circuits.
