Sharp LC-40LE820UN Service Manual page 69

HDMI: No external input video [INPUT-4]
Is INPUT-4 selected on the input select menu screen?
NO
Select INPUT-4 on the input select menu screen for the
right input signal.
YES
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin (18) of SC1503 to pin (46) of
IC1504 (HDMI_SW)?
NO
Check the line between the input terminals of SC1503
and IC1504.
Check IC1504 and its peripheral circuits
(SDA0_400K: pin53 of IC1504/SCL0_400K: pin54 of
YES IC1504, etc.).
Does the HPD signal come from pin (45) of IC1504 to pin (19) of
SC1503?
NO
Check the line between the pin (45) of IC1504 and the
pin (19) of SC1503.
Check IC1504 and its peripheral circuits
(SDA0_400K: pin53 of IC1504/SCL0_400K: pin54 of
IC1504, etc.).
YES
Are there the TMDS signal inputs at pins (19/20) (CLK-/+), (21/22)
(D0-/+), (23/24) (D1-/+), (25/26) (D2-/+), all of IC1504?
NO
Is IC1504 (pin43/pin44) accessed by I2C, with HDMI
connected, to read the DDC_I2C SDA/SCL data?
NO
Check the DDC line and its peripheral circuits.
(IC1504 and its peripherals).
YES
Are there the TMDS signal inputs at pins (AJ6/AK6) (CLK-/+), (AJ7/AK7) (D0-/+), (AJ8/
AK8) (D1-/+), (AJ9/AK9) (D2-/+), all of IC3302 (CPU)?
YES
Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of IC3302?
LVDS_TX_0_DATA0_P/N (C14/D14), LVDS_TX_0_DATA1_P/N (C15/D15),
LVDS_TX_0_DATA2_P/N (C16/D16), LVDS_TX_0_DATA3_P/N (C18/D18),
LVDS_TX_0_DATA4_P/N (C19/D19), LVDS_TX_0_CLK_P/N (C17/D17),
LVDS_TX_1_DATA0_P/N (A14/B14), LVDS_TX_1_DATA1_P/N (A15/B15),
LVDS_TX_1_DATA2_P/N (A16/B16), LVDS_TX_1_DATA3_P/N (A18/B18),
LVDS_TX_1_DATA4_P/N (A19/B19), LVDS_TX_1_CLK_P/N (A17/B17).
YES
Check the panel module.
<HDMI input> No video (5)-1
Is INPUT-5 selected on the input select menu screen?
YES
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin (18) of SC1502 to pin (42) of
IC1504 (HDMI_SW)?
YES
Does the HPD signal come from pin (41) of IC1504 to pin (19) of
SC1502?
YES
Are there the TMDS signal inputs at pins (11/12) (CLK-/+), (13/14)
(D0-/+), (15/16) (D1-/+), (17/18) (D2-/+), all of IC1504?
YES
7 – 5
LC-40/46/52/60LE820UN
HDMI: No external input video [INPUT-5]
NO
Select INPUT-5 on the input select menu screen for the
right input signal.
NO
Check the line between the input terminals of SC1502
and IC1504.
Check IC1504 and its peripheral circuits
(SDA0_400K: pin53 of IC1504/SCL0_400K: pin54 of
IC1504, etc.).
NO
Check the line between the pin (41) of IC1504 and the
pin (19) of SC1502.
Check IC1504 and its peripheral circuits
(SDA0_400K: pin53 of IC1504/SCL0_400K: pin54 of
IC1504, etc.).
NO
Is IC1504(pin39/pin40) accessed by I2C, with HDMI
connected, to read the DDC_I2C SDA/SCL data?
NO
Check the DDC line and its peripheral circuits.
(IC1504 and its peripherals).
NO Check IC1504, IC3302 and their peripheral
circuits.
NO Check IC3302 and its peripheral circuits.
(IC3501/IC3502, etc.)