LC-52SB55U
6 – 13
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-5/6/7/8(HDMI) audio.
No audio at digital broadcast signal reception.
If no video appears, refer to “No external input video (HDMI) [INPUT-5/6/
7/8]”.
Are there the video signal outputs (IF_P/N) at the pins(19) and (20)
of tuner(TU1101)?
YES
NO
Is the HDMI_MUTE line as specified?
Check TU1101 and its peripheral circuits. (SDA3/
SCL3, etc.)
YES
NO
Check Q1301, IC1302 and their peripheral circuits.
Are there the video signal inputs at pin(AM33) and (AM34) of
IC8001(CPU)?
YES
NO
Check the line between TU1101 and IC8001, and
their peripheral circuits. (L1101, C1103, etc.)
Is there the SPDIF signal output (OPT_OUT) at pin(AP11) of IC8001(CPU)?
YES
NO
Check the IC8001 and its peripheral circuits.
Is there the SPDIF signal (OPT_OUT) input at pin(2) of
IC1304(SPDIF_BUFF&MUTE)?
NO
Check the line between IC8001 and IC1304.
YES
Is there the MUTE signal input at pin(1) of IC1304?
NO
Check the MUTE_A_ALL and AC_DET signals, and
their peripheral circuits. (Q1304, Q1312, D1310,
etc.)
YES
Is there the SPDIF signal input at pin(1) of D1306(OPTICAL OUTPUT)?
NO
Check D1306 and its peripheral circuits.
No optical output under the following conditions as
per HDMI requirements.
*Audio contents protected.
*Audio frequency beyond 48kHz.
*Audio bit length beyond 16bits.
YES
Check the speakers and their peripheral circuits.
