Sharp LC-65D90U, Service Manual

Page: 45 / 167

45
LC-65D90U
TROUBLE SHOOTING TABLE
(Continued)
NO
NO YES NO
NO
YES YES YES YES YES YES YES
YES YES NO NO NO NO NO NO
No picture fr
om HDMI input
With a HDMI equipment connected, is IC1913 (EEPR
OM) accessed b
y
I2C to read the
DDC_I2C_CLOCK/D
A
T
A
data?
Chec
k IC1913 and its per
ipher
al circuits
.
Are the RESET#, INT and SCDT signals inputted and outputted at pins (102), (104) and (103) of IC1912?
Is the signal inputted from the HDMI (SC1901) connector to the input ter
minals
R1X0
±
(pins (62) and (63)), R1X1
±
(pins (66)
and (67)), R1X2
±
(pins (70) and (71)) and
R1XC
±
(pins (58) and (59)) of
IC1912 (HDCP_LSI)?
Chec
k the line betw
een IC1912 and IC800 (FPGA).
Chec
k the settings of e
xter
nal HDMI
equipment connected. Chec
k IC1912 and its per
ipher
al circuits
.
Chec
k IC1912 and its per
ipher
al circuits
.
Chec
k IC1903, IC1901 and their per
ipher
al
circuits
.
Are the HDMI_H and HDMI_L signals outputted from pins (11) and (3) of IC1903 (B
UFFER)?
Are the
Y
, Pb and Pr signals outputted from pins (20), (18) and (16) of IC1901 (MUL
TIPLEXER)?
Are the HDMI_H and HDMI_L signals outputted to pins (2) and (3) of IC1912, as w
ell as the
Y
, Pb and Pr signals to pins (14), (1
7) and (20) of IC1912?
Chec
k IC3807 and its per
ipher
al circuits
.
Chec
k IC3807, IC1903 and their per
ipher
al
circuits
.
Are the HDMI_H and HDMI_L signals outputted from pins (9) and (10) of the A
V
unit's connector PB (P5404)?
Are the
Y
, Pb and Pr signals outputted from pins (22), (20) and (18) of the A
V
unit's connector PB (P5404)?
Chec
k the "PB" har
ness
.
Are the HDMI_H and HDMI_L signals inputted to pins (9) and (10) of the main PWB's connector PB (CN1800)? Are the
Y
, Pb and Pr signals inputted to pins (22), (20) and (18) of the main PWB's connector PB (CN1800)?
Chec
k IC3701, IC3702 and their per
ipher
al
circuits
.
Are the HDMI_H and HDMI_L signals inputted to pins (26) and (25) of IC3701 (A/D_CONV
.)?
Are the
Y
, Pb and Pr signals inputted to pins (8), (11) and (13) of IC3702 (L.P
.F
.)?
Chec
k IC3700 and its per
ipher
al circuits
.
Are the
Y
, Pb and Pr signals inputted to pins (8), (2) and (14) of IC3700 (A/D_CONV
.)?
Are the
Y
, Pb and Pr signals outputted to pins (20), (18) and (16) of IC3807 (MUL
TIPLEXER)?