Sharp TU-X1U, Руководство по обслуживанию

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TU-X1U
4 – 21
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-4/5/6/7/8 (HDMI) audio. No audio at digital broadcast signal reception.
If no video appears, refer to "No external input video
(HDMI) [INPUT-4/5/6/7/8]". Are there the video signal outputs (IF_OUT_PT/NT) 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_5/
SCL3_5, 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 (L2204, C2229, etc.).
TU1101 pin (19)(P) pin (20)(N)
P1101 pin (6) pin (5)
SC2202 pin (6) pin (5)
IC8001 pin (AM33) pin (AM34)
Is there the SPDIF signal output (SPDIF_OUT) at pin (AP11) of IC8001 (CPU)? NO Check the IC8001 and its peripheral cir-
cuits.
YES
Is there the SPDIF signal (SPDIF_OUT) input at pin (4) of IC1307 (CODEC2)? NO Check the line between IC8001 and
IC1307.
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) NO Check the line between IC1307 and
IC1305.
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) NO Check the line between IC1307 and
IC1306 , and between IC1305 and
IC1306.
YES
Does the I2S signal come from pin(15)(DATA) of IC1306(DELAY2) to pins(32) of
IC1307(CODEC2) NO Check the line between IC1306 and
IC1307.
YES
Is there the SPDIF signal input at pin(2) of IC1304(SPDIF_BUFF&MUTE)? NO Check the line between IC1307 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 cir-
cuits(Q1304, Q1312, D1310, etc).
YES
Is there the SPDIF signal input at pin(1) of D509(OPTICAL OUTPUT)? NO Check D1306 and its peripheral circuits.
IC1304 pin(4) SC2203 pin(23)
P501 pin(23) D509 pin(1)
YES
No optical output under the following con-
ditions as per HDMI requirements.
*Audio contents protected.
*Audio freuency beyond 48kHz.
*Audio bit length beyond 16bits.
Check cable and Speakers.