Sharp LC32SB27U Service Manual - Page 58

pins 11 L and 4 R of IC503 AUDIO SWITCH?

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Page 58 highlights

LC-32D47U/LC-32SB27U/LC-C3237U No audio (2) [PC analog audio input] INPUT-4 No audio. [HDMI analog audio input] INPUT-5 No audio. Is INPUT-4 selected on the input select menu screen? Is INPUT-5 selected on the input select menu screen? NO Refer to ": No external input video [INPUT-4]". YES Is the audio output selected for "VARIABLE" on the menu screen? NO Refer to ": No external input video [INPUT-5]". YES Is the audio output selected for "VARIABLE" on the menu screen? NO Set the audio output to "FIXED". YES Is the "PC Audio Select" selected for "Input4 (PC)" on the menu screen? NO Set the audio output to "FIXED". YES Is the "PC Audio Select" selected for "Input5 (HDMI)" on the menu screen? NO Set the HDMI audio output to "Input4 (PC)". NO Set the HDMI audio output to "Input5 (HDMI)". YES Is the HDMI audio output selected for "Digital" on the menu screen? YES YES Does the audio signal come from pins (2) (L) and (3) (R) of input terminal (J601) to pins (11) (L) and (4) (R) of IC503 (AUDIO SWITCH)? NO Set the HDMI audio output to "Analog". NO Check the line between J601 and IC8001. YES Does the audio signal come from pins (13) (L) and (3) (R) of IC503 to pins (B2) (L) and (A1) (R) of IC8001 (CPU)? YES Does the audio signal come from pins (C4/A3) (SPOUT_L/R) of IC8001 (CPU) to pins (3) (INLP), and (7) (INRP) of IC2701 (AMP)? YES Is the audio output from IC2701 as specified? NO Check IC503/IC8001 and its peripheral circuits (IC502, Q509, Q510, etc). Check the line between IC503 and IC8001. NO Check the line between IC8001 and IC2701, and their peripheral circuits (Q1306/Q1307, AMP_MUTE line, etc). NO Check IC2701 and its peripheral circuits. YES Check the connector (P2701), speakers and their peripheral circuits. 6 - 8

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LC-32D47U/LC-32SB27U/LC-C3237U
6 – 8
No audio (2)
[PC analog audio input] INPUT-4 No audio.
[HDMI analog audio input] INPUT-5 No audio.
Is INPUT-4 selected on the input select menu screen?
Is INPUT-5 selected on the input select menu screen?
YES
NO
YES
NO
Refer to “: No external input video [INPUT-4]”.
Refer to “: No external input video [INPUT-5]”.
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”.
Is the “PC Audio Select” selected for “Input4 (PC)” on the menu
screen?
Is the “PC Audio Select” selected for “Input5 (HDMI)” on the menu screen?
YES
NO
YES
NO
Set the HDMI audio output to “Input4 (PC)”.
Set the HDMI audio output to “Input5 (HDMI)”.
Is the HDMI audio output selected for “Digital” on the menu screen?
YES
NO
Set the HDMI audio output to “Analog”.
Does the audio signal come from pins (2) (L) and (3) (R) of input terminal (J601) to
pins (11) (L) and (4) (R) of IC503 (AUDIO SWITCH)?
NO
Check the line between J601 and IC8001.
YES
Does the audio signal come from pins (13) (L) and (3) (R) of IC503 to pins (B2) (L)
and (A1) (R) of IC8001 (CPU)?
NO
Check IC503/IC8001 and its peripheral circuits
(IC502, Q509, Q510, etc).
Check the line between IC503 and IC8001.
YES
Does the audio signal come from pins (C4/A3) (SPOUT_L/R) of IC8001 (CPU) to
pins (3) (INLP), and (7) (INRP) of IC2701 (AMP)?
NO
Check the line between IC8001 and IC2701,
and their peripheral circuits (Q1306/Q1307,
AMP_MUTE line, etc).
YES
Is the audio output from IC2701 as specified?
NO
Check IC2701 and its peripheral circuits.
YES
Check the connector (P2701), speakers and their peripheral circuits.