Sharp TU-X1U Service Manual page 38

TU-X1U
HDMI: No external input video [INPUT-5]
Is INPUT-5 selected on the input select menu screen?
Select INPUT-5 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
SC1601 to pin (32) of IC1604 (HDMI_SW1)?
YES
Does the HPD signal come from pin (16) of IC1604 to
pin (19) of SC1601?
YES
Are there the TMDS signal inputs at pins (18/19)(CLK-/+), (21/
22)(D0-/+), (24/25)(D1-/+), (27/28)(D2-/+), all of IC1604
(HDMI_SW1)?
Is IC1601 (EEPROM) accessed by I2C, with HDMI
connected, to read the DDC_I2C SCL/SDA data?
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
Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of IC8001 (CPU)?
LVDS_TX_0_DATA0_P/N (C7/B7), LVDS_TX_0_DATA1_P/N (E7/D7),
LVDS_TX_0_DATA2_P/N (C6/B6), LVDS_TX_0_DATA3_P/N (C5/B5),
LVDS_TX_0_DATA4_P/N (E5/D5), LVDS_TX_0_CLK_P/N (E6/D6),
LVDS_TX_1_DATA0_P/N (B4/A4), LVDS_TX_1_DATA1_P/N (E4/D4),
LVDS_TX_1_DATA2_P/N (B3/A3), LVDS_TX_1_DATA3_P/N (B1/B2),
LVDS_TX_1_DATA4_P/N (F5/F6), LVDS_TX_1_CLK_P/N (C2/C3).
<HDMI input> No video (6)
NO
NO
Check the line between the input
terminals of SC1601 and IC1604.
NO
Check the line between IC1604 and
SC1601, and their peripheral cir-
cuits. (Q1602, etc)
NO
NO
Check the DDC line and its periph-
eral circuits. (IC1601, IC1606 and
its peripherals).
HDMI: No external input video [INPUT-6]
Is INPUT-6 selected on the input select menu screen?
Select INPUT-6 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
SC1602 to pin (52) of IC1604 (HDMI_SW1)?
Does the HPD signal come from pin (36) of IC1604
to pin (19) of SC1602?
YES
Are there the TMDS signal inputs at pins (38/39)(CLK-/+), (41/
42)(D0-/+), (44/45)(D1-/+), (47/48)(D2-/+), all of IC1604
(HDMI_SW1)?
Is IC1603 (EEPROM) accessed by I2C, with HDMI
connected, to read the DDC_I2C SCL/SDA data?
YES
NO
No
NO
4 – 11
NO
NO
Check the line between the input
terminals of SC1602 and IC1604.
YES
NO
Check the line between IC1604
and SC1602, and their peripheral
circuits. (Q1603, etc)
NO
NO
Check the DDC line and its
peripheral circuits. (IC1603,
IC1607 and its peripherals).
Check IC1502, IC1604 and their
peripheral circuits.
Check the line between IC1502
and IC8001, and their peripheral
circuits.
Check IC8001 and its peripheral
circuits. (IC8151 thru IC8154,
etc.)