Sharp LC-40LE820UN Service Manual page 72

LC-40/46/52/60LE820UN
[PC analog audio input] INPUT-3 No audio.
Is INPUT-3 selected on the input select menu screen?
NO
Refer to ": No external input video [INPUT-3]".
YES
Is the audio output selected for "VARIABLE" on the menu screen?
NO
Set the audio output to "FIXED".
YES
Is the "PC input" - "Audio select for "Video + Audio" on the menu
screen?
NO
Set the "PC input" - "Analog select" to "Video +
Audio".
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.
No audio (2)
[HDMI analog audio input] INPUT-4 No audio.
Is INPUT-4 selected on the input select menu screen?
YES
Is the audio output selected for "VARIABLE" on the menu screen?
YES
Is the "PC input" - "Audio select" selected for "HDMI + Analog" on
the menu screen?
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.
7 – 8
NO
Refer to ": No external input video [INPUT-4]".
NO
Set the audio output to "FIXED".
NO
Set the "PC input" - "Analog select" to "HDMI +
Analog.