Sharp LC-46D92U Service Manual page 66

LC-46D92U/LC-52D92U
No INPUT-4/5/6 (HDMI) audio
If no video appears, refer
to "No external input video
(HDMI) [INPUT-4/5/6]".
Is the SII9011_MUTE line
as specified?
NO
YES
Does the HDMI_SPDIF
signal come from pin (78)
NO
of IC1510 to pin (2) of
IC1404 (CODEC)?
YES
Is there the SPDIF signal
output at pin (23) of
NO
IC1404(CODEC)?
YES
Is there the SPDIF signal
input at pin (2) of IC1305
NO
(SPDIF_BUFF.)?
No audio signal at DIGITAL AUDIO OUTPUT terminal (Analog sound heard)
Check Q1301, IC1303
and their peripheral cir-
cuits.
Check the line between
IC1510 and IC1404 and
their peripheral circuits.
Check IC1404 and its
peripheral circuits.
Check the line between
IC1404 and IC1305 and
their peripheral circuits.
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 (DEMODULA-
TOR)?
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),
respectively?
YES
Is the DTV_SPDIF signal
output at pin (R33) of
IC8101?
YES
YES Is the DTV_SPDIF signal
input at pin (5) of IC1404?
4 – 18
Check the tuner
(TU1101) and its
NO
peripheral circuits.
Replace as required.
Check the line
between tuner
NO
(TU1101) and IC8601,
and their peripheral
circuits (filter circuit,
etc.).
Check the line
between IC8601 and
NO
IC8101, and their
peripheral circuits.
Check IC8101 and its
peripheral circuits.
NO
Check the line
between IC8101 and
NO
IC1404, and their
peripheral circuits.