Sharp LC-37D44U Service Manual page 43

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
SC1601 to pin(72) of IC1604(HDMI-SW)?
YES
Does the HPD signal come from pin(56) of
IC1604 to pin(19) of SC1601?
YES
Are there the TMDS signal inputs at pins(58/59)(CLK-/+), (61/
62)(D0-/+), (64/65)(D1-/+), (67/68)(D2-/+), all of IC1604?
Is IC1601(EEPROM) accessed by I2C, with
HDMI connected, to read the DDC_I2C SCL/
SDA data?
Check the DDC line and its peripheral cir-
cuits.(IC1601 and its peripherals).
YES
Are there the TMDS signal inputs at pins(AM1/AM2)(CLK-/+), (AN1/AN2)(D0-/+), (AM3/AM4)(D1-/+), (AP2/AN3)(D2-/+), all of IC8001(CPU)?
Are digital video (LVDS) signals sent from pins B5~7, C5~7, D5~7,
and E5~7 of IC8001?
Are digital video (RSDS) signals sent from IC5103 to SC5201 and
SC5202?
Check between (SC5201, SC5202) and LCD Panel.
[HDMI signal input] No video (5)
NO
NO
Check the line between
the input terminals of
SC1601 and IC1604.
NO
Check the line between
IC1604 and SC1601.
IC1604 pin(56)
IC1607 pin(4)
SC1601 pin(19)
NO
NO
YES
YES
YES
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 SC1602 to
pin(52) of IC1604(HDMI-SW)?
YES
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?
Is IC1603(EEPROM) accessed by I2C, with HDMI con-
nected, to read the DDC_I2C SCL/SDA data?
Check the DDC line and its peripheral circuits.(IC1603 and
its peripherals).
YES
Check IC1604, IC8001 and their peripheral circuits.
NO Check the line between IC8001 and IC5103.
Check IC8001 and peripheral circuits.
NO Check the line between IC5103 and SC5201 and SC5202.
Check IC5103 and peripheral circuits.
6 – 5
LC-37D44U
NO
NO
Check the line between the input ter-
minals of SC1602 and IC1604.
NO
Check the line between IC1604 and
SC1602.
IC1604 pin(36)
IC1608 pin(4)
SC1602 pin(19)
NO
NO
NO