Sharp LC-37D90U Service Manual page 88

LC-37D90U
No external digital input video [INPUT-5]
Is INPUT-5 selected on the input select menu screen?
YES
Select INPUT-5 on the input select menu screen for
the right input signal (AUTO or DIGITAL).
Does the HOT PLUG detection function? Does the HDMI_HPG1 signal come from pin (14) of DVI connector
(SC1503) to pin (67) of IC9101 (CPLD)?
Does the HDMI_PLG_EN signal come from pin (77) of IC9101 to pin (44) of IC1508 (HDMI/HDCP/DVI COMPLIANT
RECEIVER) and pin (40) of IC1507 (DVI/HDMI SWITCH)?
Does the HDP1 signal come from pin (80) of IC1507 to pin (16) of SC1503?
Does the signal come from DVI connector (SC1503) to the input
pins (5 and 6) (CLK±), (8 and 9) (D0±), (11 and 12) (D1±), and (14
and 15) (D2±), all of IC1507?
YES
<DVI signal input>
NO
NO
YES
YES
NO
6 – 9
No video (4)
No external analog input video [INPUT-5]
Is INPUT-5 selected on the input select menu screen?
NO
Select INPUT-5 on the input select menu screen for the
right input signal (AUTO or ANALOG).
NO
NO
Check the line between SC1503 and IC9101 (CPLD)
(Q1501, Q1502, etc.).
NO
Check the line between IC1901 and IC1507/IC1508.
NO
Check the line between IC1507 and SC1503.
Do the DVI_PC_R/G/B and DVI_PC_VD/HD signals come from HDMI
connector (SC1503) to the input pins of IC3301 (Q1509 thru Q1511,
IC1503, etc.)?
NO
YES
YES