Sharp LC-60E77UN Service Manual page 58

LC-60E77UN/LC-65E77UM/LC-C6077UN/LC-C6577UM
[PC analog audio input] INPUT-4 No audio.
Is INPUT-4 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
Set the audio output to "FIXED".
YES
Is the "PC Audio Select" selected for "Input4 (PC)" on the menu
screen?
NO
Set the HDMI audio output to "Input4 (PC)".
YES
Does the audio signal come from pins (2) (L) and (3) (R) of input terminal (J1801) to pins (V28)
(L) and (V27) (R) of IC8001 (CPU)?
YES
Does the audio signal come from pins (N29/N30) (PGA0OUT_L/R)
of IC8001 (CPU) to pins (4/7) (INLP/INRP) of IC2701 (AMP)?
NO
Check the line between IC8001 and IC2701,
and their peripheral circuits (Q1306,
AMP_MUTE line, etc.).
YES
Is the audio output from IC2701 as specified?
YES
Check the connector (P2701), speakers and their peripheral cir-
cuits.
No audio (2)
[HDMI analog audio input] INPUT-6 No audio.
Is INPUT-6 selected on the input select menu screen?
YES
Is the audio output selected for "VARIABLE" on the menu screen?
YES
Is the "PC Audio Select" selected for "Input6 (HDMI)" on the menu
screen?
YES
Is the HDMI audio output selected for "Digital" on the menu screen?
YES
NO
Check the line between J1801 and IC8001.
NO Check IC2701 and its peripheral circuits.
6 – 10
NO
Refer to ": No external input video [INPUT-6]".
NO
Set the audio output to "FIXED".
NO
Set the HDMI audio output to "Input6 (HDMI)".
NO
Set the HDMI audio output to "Analog".