Hdmi: No External Input Video - Sharp LC-52LE640U Service Manual

LC-52/60/70LE640U,C6400U (1st Edition)
Is INPUT-1 selected on the input select menu screen?
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin (18) of SC1503 to pin (60) of IC1504
(HDMI_SW)?
Does the HPD signal come from pin (59) of IC1504 to pin (19) of SC1503?
Are there the TMDS signal inputs at pins (26/27) (CLK-/+), (28/29) (D0-/+), (30/31)
(D1-/+), (32/33) (D2-/+), all of IC1504?
Are there the all of TMDS inputs at pins (AM9/AL9) (CLK-/+), (AM10/AL10) (D0-/+),
(AM11/AL11) (D1-/+), (AM12/AL12) (D2-/+) of IC3303 (CPU)?
Is the T-CON PWB connected?
VBO_HTPDN (40pin), VBO_LOCKN (39pin) of P2604 become Low if there is no
problem in the connection.
Are the V-By-One signal input to the pin of P2604?
VBO_CN_TXA+/- (36/37pin), VBO_CN_TXB+/- (32/33pin),
VBO_CN_TXC+/- (28/29pin), VBO_CN_TXD+/- (24/25pin).
Check the panel module and harness.
<HDMI input> No video (5)-1
HDMI: No external input video [INPUT-1]
YES
YES
YES
YES
YES
YES
YES
6 – 11
NO Select INPUT-1 on the input select menu screen
for the right input signal.
Check the line between the input terminals of
SC1503 and IC1504.
NO
Check IC1504 and its peripheral circuits
(SDA1_400K: pin70 of IC1504/SCL1_400K: pin71
of IC1504, etc.).
NO Check the line between the pin (59) of IC1504 and
the pin (19) of SC1503.
Check IC1504 and its peripheral circuits
(SDA1_400K: pin70 of IC1504/SCL1_400K: pin71
of IC1504, etc.).
Is IC1504 (pin57/pin58) accessed by I2C, with
NO
HDMI connected, to read the DDC_I2C SDA/SCL
data?
Check the DDC line and its peripheral circuits.
(IC1504 and its peripherals).
NO Check the line between IC1504 and IC3303, and
their peripheral circuits.
NO Check the panel module and harness.
NO Check IC3303 and its peripheral circuits.
(IC3501/IC3502/IC3503, etc.)
NO