Sharp TU-X1U Service Manual page 45

[HDMI analog audio input] INPUT-5 No audio.
Is INPUT-5 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on
the menu screen?
Set the audio output to "FIXED".
Is the HDMI audio output selected for "Digital"
on the menu screen?
Set the HDMI audio output to "Analog".
YES
Does the audio signal come from pins(2)(L) and (4)(R) of input
terminal(J601) to pins(43)(L) and (44)(R) of IC1403(CODEC)?
Check the line between J601 and IC1403.
J601 pin (2)(L)
P601 pin (5)
P1401 pin (5)
IC1403 pin (43)
YES
Does the I2S signal come from pins(4)(COD_LRCK), (5)(COD_BCK) and (6)(COD_SDOUT)
of IC1403 to pins(AK24), (AH24) and (AJ24) of IC8001(CPU)?
YES
Does the I2S signal come from pins(AL24)(DSP_MCLK1), (AK25)(DSP_BCKIN1),
(AJ25)(DSP_LRCK1), (AL25)(DSP_SDIN1) of IC8001(CPU) to pins(5), (11), (10), (9) of
IC4504(HDMI_Tx)
YES
Does the HOT PLUG detection function?
Is the DDC5V signal output at the pin(18) of SC4501(HDMI_OUTPUT)?
YES
Does the HPD signal come from pin(19) of SC4501(HDMI_OUTPUT) to pin(51) of
IC4504(HDMI_Tx)?
YES
Are there the TMDS signal outputs at pins(12/10)(CLK-/+), (9/7)(D0-/+), (6/4)(D1-/+), (3/
1)(D2-/+), all of SC4501(HDMI_OUTPUT)?
YES
Check the HDMI cable and Monitor Unit.
No audio (2)
NO
NO
pin (4)(R)
pin (7)
pin (7)
pin (44)
4 – 18
[PC analog audio input] INPUT-9 No audio.
Is INPUT-9 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
YES
Does the audio signal come from pins(2)(L) and (3)(R) of input termi-
nal(J603) to pins(46)(L) and (47)(R) of IC1403(CODEC)?
Check the line between J603 and IC1403.
J603 pin (2)(L)
P601 pin (13)
P1401 pin (13)
IC1403 pin (46)
YES
NO
NO
NO
NO
NO
TU-X1U
NO
NO
pin (3)(R)
pin (15)
pin (15)
pin (47)
Check the line between IC1403 and
IC8001, and their peripheral cir-
cuits(X1401, IC1401, etc.).
Check the line between IC8001 and
IC4504, and their peripheral circuits.
Check the line between SC4501 and
IC4503, and their peripheral circuits.
Check the line between SC4501 and
IC4504, and their peripheral circuits.
Check the HDMI cable and Monitor
Unit.
Check the line between SC4501 and
IC4504, and their peripheral circuits.