Sharp LC-37D90U Service Manual page 86

LC-37D90U
No external input video [INPUT-3]
Is INPUT-3 selected on the input select menu screen?
YES
Select INPUT-3 on the input select menu screen for the
right input signal.
Does the HOT PLUG detection function?
Does the HDMI_HPG3 signal come from pin (18) of con-
nector (SC1501) to pin (69) of IC9101 (CPLD)?
YES
Check the line between SC1501 and IC9101
(CPLD) (Q1506, Q1508, etc.).
Does the HDMI_PLG_EN signal come from pin (77) of
IC9101 to pin (44) of IC1508 (HDMI/HDCP/DVI COMPLI-
ANT RECEIVER) and pin (40) of IC1507 (DVI/HDMI
SWITCH)?
YES
Check the line between IC1901 and IC1507/
IC1508.
Does the HDP3 signal come from pin (44) of IC1507 to pin
(19) of SC1501?
Check the line between IC1507 and SC1501.
<HDMI signal input>
Is INPUT-4 selected on the input select menu screen?
NO
NO
NO
NO
NO
6 – 7
No video (3)
No external input video [INPUT-4]
YES
Select INPUT-4 on the input select menu screen for the
right input signal.
Does the HOT PLUG detection function?
Does the HDMI_HPG2 signal come from pin (18) of con-
nector (SC1502) to pin (68) of IC9101 (CPLD)?
YES
Check the line between SC1502 and
IC9101 (CPLD) (Q1505, Q1507, etc.).
Does the HDMI_PLG_EN signal come from pin (77) of
IC9101 to pin (44) of IC1508 (HDMI/HDCP/DVI COMPLI-
ANT RECEIVER) and pin (40) of IC1507 (DVI/HDMI
SWITCH)?
YES
Check the line between IC1901 and
IC1507/IC1508.
Does the HDP2 signal come from pin (62) of IC1507 to
pin (19) of SC1502?
Check the line between IC1507 and
SC1502.
NO
NO
NO
NO
NO