Sharp Aquos LC-42D72U, Service Manual

Page: 40 / 162

LC-42D72U
4 – 9
<DVI signal input> No video (4)
No external input video [INPUT-6] No external input video [INPUT-6]
Is INPUT-6 selected on the input select menu screen? Is INPUT-6 selected on the input select menu screen?
YES
NO NO
NO
Select INPUT-6 on the input select menu screen for
the right input signal (AUTO or DIGITAL). Select INPUT-6 on the input select menu screen for
the right input signal (AUTO or ANALOG).
NO NO
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)?
YES
NO
Check the line between SC1503 and IC9101
(CPLD) (Q1501, Q1502, 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
NO
Check the line between IC1901 and IC1507/
IC1508.
Does the HDP1 signal come from pin (80) of IC1507 to pin (16) of SC1503?
NO
Check the line between IC1507 and 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?
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.)?
YES
NO NO
YES
Is IC1505 (EEPROM) accessed by I2C, with DVI connected, to read the DDC_I2C CLOCK/DATA data?
NO