Sharp AQUOS LC-32D62U, Service Manual

Page: 43 / 162

LC-32D62U/LC-37D62U 1st
6 – 11
No audio signal at DIGITAL AUDIO OUTPUT terminal (Analog sound heard)
No INPUT-4/5 (HDMI) audio No audio at digital broadcast signal reception
If no video appears, refer to
“No external input video
(HDMI) [INPUT-4/5]”. Are there the IF_OUT_N
and IF_OUT_P signal out-
puts at pins (20) and (19) of
tuner (TU1101)? NO Check the tuner (TU1101)
and its peripheral circuits.
Replace as required.
YES
Is the SII9011 (pin (77) of
IC1510) _MUTE line as
specified? NO Check Q1301, IC1303 and
their peripheral circuits. Are there the IF_OUT_N
and IF_OUT_P signal inputs
at pins (11) and (10) of
IC8601 (DEMODULATOR)? NO Check the line between
tuner (TU1101) and IC8601,
and their peripheral circuits
(filter circuit, etc.).
YES YES
Does the HDMI_SPDIF sig-
nal come from pin (78) of
IC1510 to pin (2) of IC1404
(CODEC)?
NO Check the line between
IC1510 and IC1404 and
their peripheral circuits. Do the US_TS_CLK/DATA/
EN/PKTSYNC signals come
from pins (51, 59, 63 and
66) of IC8601 to pins (D11,
A9, C10, B10) of IC8101
(CPU/DECODER), respec-
tively? NO Check the line between
IC8601 and IC8101, and
their peripheral circuits.
YES
YES
Is the DTV_SPDIF signal
output at pin (R33) of
IC8101? NO Check IC8101 and its
peripheral circuits.
YES
Is the DTV_SPDIF signal
input at pin (5) of IC1404? NO Check the line between
IC8101 and IC1404, and
their peripheral circuits.
YES
Is there the SPDIF signal output at pin (23) of IC1404 (CODEC)? NO Check IC1404 and its
peripheral circuits.
YES
Is there the SPDIF signal input at pin (2) of IC1305 (SPDIF_BUFF)? NO Check the line between
IC1404 and IC1305 and
their peripheral circuits.
YES
Is there the MUTE signal input at pin (1) of IC1305? NO Check the MUTE_A_ALL
and ACDET_MUTE signals.
YES
Is there the SPDIF signal input at pin (1) of DIGITAL AUDIO OUTPUT terminal (D1313)?
NO
Check D1313 and its peripheral circuits. Replace as required.
No optical output under the following conditions as per HDMI requirements.
* Audio contents protected
* Audio frequency beyond 48 KHz
* Audio bit length beyond 16 bits