Sharp TU-X1U Service Manual page 40

TU-X1U
HDMI: No external input video [INPUT-7]
Is INPUT-7 selected on the input select menu screen?
Select INPUT-7 on the input select menu screen for the
right input signal.
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin (18) of SC1701
to pin (32) of IC1701 (HDMI_SW2)?
Check the line between the input terminals
of SC1701 and IC1701.
YES
Does the HPD signal come from pin (16) of IC1701 to pin
(19) of SC1701?
Check the line between IC1701 and
SC1701, and their peripheral circuits.
(Q1701, etc.)
YES
Are there the TMDS signal inputs at pins (18/19)(CLK-/+), (21/
22)(D0-/+), (24/25)(D1-/+), (27/28)(D2-/+), all of IC1701
(HDMI_SW2)?
Is IC1703 (EEPROM) accessed by I2C, with HDMI con-
nected, to read the DDC_I2C SCL/SDA data?
Check the DDC line and its peripheral cir-
cuits. (IC1701, IC1703 and its peripherals).
YES
Are there the TMDS signal inputs at pins (58/59)(CLK-/+), (61/62)(D0-/+), (64/65)(D1-/+),
(67/68)(D2-/+), all of IC1604 (HDMI_SW1)?
YES
Are there the TMDS signal inputs at pins (39/40)(CLK-/+), (43/44)(D0-/+), (47/48)(D1-/+),
(51/52)(D2-/+), all of IC1502 (HDMI_Rx)?
YES
Are there the HD_DIV[29:0],HD_DVI_CLK_P,HD_DVI_VSYNC,HD_DVI_HSYNC,
HD_DVI_DE signal inputs to IC8001?
HD_DVI
29-20 (AN10/AL11/AM10/AN9/AL10/AM9/AN8/AP8/AP7/AL9),
19-10 (AM8/AH11/AJ10/AH10/AJ15/AH9/AK8/AH7/AK9/AM7),
9-0 (AN6/AL8/AL7/AN5/AP5/AM6/AL6/AP4/AN4/AM5),
HD_DIV_CLK (AK10), HD_DVI_DE (AH12),
HD_DVI_HSYNC (AK11), HD_DVI_VSYNC (AH13)
YES
<HDMI input> No video (7)
NO
NO
NO
NO
NO
4 – 13
HDMI: No external input video [INPUT-8]
Is INPUT-8 selected on the input select menu screen?
Select INPUT-8 on the input select menu screen for
the right input signal.
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin(18) of SC1702
to pin (52) of IC1701 (HDMI_SW2)?
Check the line between the input termi-
nals of SC1702 and IC1701.
YES
Does the HPD signal come from pin (36) of IC1701 to
pin (19) of SC1702?
Check the line between IC1701 and
SC1702, and their peripheral circuits.
(Q1702, etc.)
YES
Are there the TMDS signal inputs at pins (38/39)(CLK-/+), (41/
42)(D0-/+), (44/45)(D1-/+), (47/48)(D2-/+), all of IC1701
(HDMI_SW2)?
Is IC1704(EEPROM) accessed by I2C, with HDMI
connected, to read the DDC_I2C SCL/SDA data?
Check the DDC line and its peripheral
circuits. (IC1701, IC1704 and its periph-
erals).
YES
NO Check IC1604, IC1701 and their periph-
eral circuits.
NO Check IC1502, IC1604 and their periph-
eral circuits.
NO Check the line between IC1502 and
IC8001, and their peripheral circuits.
NO
NO
NO
NO
NO