Sharp TU-X1U Service Manual page 48

TU-X1U
No INPUT-4/5/6/7/8 (HDMI) audio.
If no video appears, refer to "No external input video
(HDMI) [INPUT-4/5/6/7/8]".
Is the HDMI_MUTE line as specified?
Check Q1301, IC1302 and their peripheral
circuits.
YES
Is there the SPDIF signal output (SPDIF_OUT) at pin (AP11) of IC8001 (CPU)?
YES
Is there the SPDIF signal (SPDIF_OUT) input at pin (4) of IC1307 (CODEC2)?
YES
Does the I2S signal come from pins (11)(BCLK), (10)(LRCLK), (12)(DATA) of IC1307
(CODEC2) to pin s(16), (1), (2) of IC1305(DELAY1)
YES
Does the I2S signal come from pins(11)(BCLK), (10)(LRCLK) of IC1307(CODEC2) to
pins(16), (1) of IC1306(DELAY2), and pin(15)(DATA) of IC1305(DELAY1) to pin(12) of
IC1306(DELAY2)
YES
Does the I2S signal come from pin(15)(DATA) of IC1306(DELAY2) to pins(32) of
IC1307(CODEC2)
YES
Is there the SPDIF signal input at pin(2) of IC1304(SPDIF_BUFF&MUTE)?
YES
Is there the MUTE signal input at pin(1) of IC1304?
YES
Is there the SPDIF signal input at pin(1) of D509(OPTICAL OUTPUT)?
YES
Check cable and Speakers.
No audio signal at Digital Audio Output terminal (Analog sound heard)
NO
No audio at digital broadcast signal reception.
Are there the video signal outputs (IF_OUT_PT/NT) at the pins (19)
and (20) of tuner (TU1101)?
Check TU1101 and its peripheral circuits (SDA3_5/
SCL3_5, 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 (L2204, C2229, etc.).
TU1101 pin (19)(P)
P1101 pin (6)
SC2202 pin (6)
IC8001 pin (AM33)
YES
NO
NO
NO
NO
NO
NO
NO
NO
4 – 21
NO
NO
pin (20)(N)
pin (5)
pin (5)
pin (AM34)
Check the IC8001 and its peripheral cir-
cuits.
Check the line between IC8001 and
IC1307.
Check the line between IC1307 and
IC1305.
Check the line between IC1307 and
IC1306 , and between IC1305 and
IC1306.
Check the line between IC1306 and
IC1307.
Check the line between IC1307 and
IC1304.
Check the MUTE_A_ALL and AC_DET
signals, and their peripheral cir-
cuits(Q1304, Q1312, D1310, etc).
Check D1306 and its peripheral circuits.
IC1304 pin(4) SC2203 pin(23)
P501 pin(23) D509 pin(1)
No optical output under the following con-
ditions as per HDMI requirements.
*Audio contents protected.
*Audio freuency beyond 48kHz.
*Audio bit length beyond 16bits.