Sharp LC-42D65U Service Manual page 54

LC-42D65U
No INPUT-5/6/7/8(HDMI) audio.
If no video appears, refer to "No external input video (HDMI) [INPUT-5/6/
7/8]".
Is the HDMI_MUTE line as specified?
Check Q1301, IC1302 and their peripheral circuits.
YES
Is there the SPDIF signal output (OPT_OUT) at pin(AP11) of IC8001(CPU)?
Is there the SPDIF signal (OPT_OUT) input at pin(2) of
IC1304(SPDIF_BUFF&MUTE)?
Is there the MUTE signal input at pin(1) of IC1304?
Is there the SPDIF signal input at pin(1) of D1306(OPTICAL OUTPUT)?
Check the speakers and their peripheral circuits.
No audio signal at Digital Audio Output terminal (Analog sound heard)
NO
YES
YES
YES
YES
No audio at digital broadcast signal reception.
Are there the video signal outputs (IF_P/N) at the pins(19) and (20)
of tuner(TU1101)?
Check TU1101 and its peripheral circuits. (SDA3/
SCL3, etc.)
YES
Are there the video signal inputs at pin(AM33) and (AM34) of
IC8001(CPU)?
Check the line between TU1101 and IC8001, and
their peripheral circuits. (L1101, C1103, etc.)
YES
Check the IC8001 and its peripheral circuits.
NO Check the line between IC8001 and IC1304.
Check the MUTE_A_ALL and AC_DET signals, and
NO
their peripheral circuits. (Q1304, Q1312, D1310,
etc.)
Check D1306 and its peripheral circuits.
No optical output under the following conditions as
NO
per HDMI requirements.
*Audio contents protected.
*Audio frequency beyond 48kHz.
*Audio bit length beyond 16bits.
6 – 14
NO
NO
NO