Sharp LC-32D62U Service Manual page 43

No INPUT-4/5 (HDMI) audio
If no video appears, refer to
"No external input video
(HDMI) [INPUT-4/5]".
Is the SII9011 (pin (77) of
IC1510) _MUTE line as
specified?
YES
Does the HDMI_SPDIF sig-
nal come from pin (78) of
IC1510 to pin (2) of IC1404
(CODEC)?
YES
Is there the SPDIF signal output at pin (23) of IC1404 (CODEC)?
Is there the SPDIF signal input at pin (2) of IC1305 (SPDIF_BUFF)?
Is there the MUTE signal input at pin (1) of IC1305?
Is there the SPDIF signal input at pin (1) of DIGITAL AUDIO OUTPUT terminal (D1313)?
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
No audio signal at DIGITAL AUDIO OUTPUT terminal (Analog sound heard)
NO Check Q1301, IC1303 and
their peripheral circuits.
NO Check the line between
IC1510 and IC1404 and
their peripheral circuits.
YES
YES
YES
NO
No audio at digital broadcast signal reception
Are there the IF_OUT_N
and IF_OUT_P signal out-
puts at pins (20) and (19) of
tuner (TU1101)?
YES
Are there the IF_OUT_N
and IF_OUT_P signal inputs
at pins (11) and (10) of
IC8601 (DEMODULATOR)?
YES
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?
YES
Is the DTV_SPDIF signal
output at pin (R33) of
IC8101?
YES
Is the DTV_SPDIF signal
input at pin (5) of IC1404?
YES
6 – 11
LC-32D62U/LC-37D62U 1st
NO Check the tuner (TU1101)
and its peripheral circuits.
Replace as required.
NO Check the line between
tuner (TU1101) and IC8601,
and their peripheral circuits
(filter circuit, etc.).
NO Check the line between
IC8601 and IC8101, and
their peripheral circuits.
NO Check IC8101 and its
peripheral circuits.
NO Check the line between
IC8101 and IC1404, and
their peripheral circuits.
NO Check IC1404 and its
peripheral circuits.
NO Check the line between
IC1404 and IC1305 and
their peripheral circuits.
NO Check the MUTE_A_ALL
and ACDET_MUTE signals.