Sharp TU-X1U Service Manual page 36

TU-X1U
HDMI: No external input video [INPUT-4]
Is INPUT-4 selected on the input select menu screen?
Select INPUT-4 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 SC1501 to pin (30) of IC1502
(HDMI_Rx)?
Check the line between the input terminals of SC1501 and IC1502.
YES
Does the HPD signal come from pin(AD4) of IC8001 to pin(19) of SC1501?
Check the line between IC8001 and SC1501, and their peripheral
circuits. (Q1501, etc)
YES
Are there the TMDS signal inputs at pins(57/58)(CLK-/+), (61/62)(D0-/+), (65/66)(D1-/+),
(69/70)(D2-/+), all of IC1502(HDMI_Rx)?
Is IC1504(EEPROM) accessed by I2C, with HDMI connected, to read the
DDC_I2C SCL/SDA data?
Check the DDC line and its peripheral circuits.(IC1501, IC1504 and
its peripherals).
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),
YES
Are the LVDS signal inputs at the LVDS 1st channel and 2nd channel of IC4601(FPGA)?
LVDS_TX_0_DATA0_P/N(T3/R3), LVDS_TX_0_DATA1_P/N(T5/T4),
LVDS_TX_0_DATA2_P/N(R7/T7), LVDS_TX_0_DATA3_P/N(R11/P11),
LVDS_TX_0_DATA4_P/N(T13/R13), LVDS_TX_0_CLK_P/N(P9/N9),
LVDS_TX_1_DATA0_P/N(B14/A14), LVDS_TX_1_DATA1_P/N(B13/A13),
LVDS_TX_1_DATA2_P/N(A9/A10), LVDS_TX_1_DATA3_P/N(A4/A5),
LVDS_TX_1_DATA4_P/N(C3/B3), LVDS_TX_1_CLK_P/N(A8/B8)
YES
<HDMI input> No video (5)
NO
NO
NO
NO
NO
4 – 9
NO Check the line between IC1502 and
IC8001, and their peripheral circuits.
NO Check IC8001 and its peripheral cir-
cuits.(IC8151 thru IC8154, etc.)
NO Check the line between IC8001 and
IC4601, and their peripheral circuits.