VSX-LX50
54
1
2
3
4
1
2
3
4
C
D
F
A
B
E
C
Check
the
patterns,
Q101
or
R134
in
the
path.
If
Q101
or
R134
is
failure,
replace
Q101
or
R134.
B
Step
2-4:
Hot
Plug
Detect
JA101
(Pin
19)
HPD
(HDMI
IN1)
*
When
connected
the
source
e
q
uipment
to
IN1.
D-2
Is
the
voltage
5
V?
Yes
Step
2-5:
DDC
JA101
(Pin
16)
SDA
(HDMI
IN1)
*
When
connected
the
source
e
q
uipment
to
IN1.
E-1
Does
a
signal
output
in
constant
period
(0
to
5
V)
?
IC501
(Pin
92)
HPDETO
(HDMI
IN1)
D-1
Is
the
voltage
"L"
(0
V)?
Check
the
parts
and
patterns
in
the
path.
If
IC501
is
failure,
replace
IC501.
Check
the
parts
and
patterns
in
the
path.
If
Q151
or
R161
is
failure,
replace
Q151
or
R161.
Yes
IC501
(Pin
93)
HPDETI
(HDMI
IN2)
*
When
connected
the
source
e
q
uipment
to
IN2.
*
When
connected
the
sink
e
q
uipment
to
OUT
D-3
Is
the
voltage
"L"
(0
V)?
Check
the
parts
and
patterns
in
the
path.
If
IC501
is
failure,
replace
IC501.
Yes
JA102
(Pin
19)
HPD
(HDMI
IN2)
D-4
Is
the
voltage
5
V?
Check
the
parts
and
patterns
in
the
path.
If
Q171
or
R181
is
failure,
replace
Q171
or
R181.
Yes
Check
the
patterns
and
JA101
in
the
path.
If
JA101
is
failure,
replace
JA101.
*
When
connected
the
source
e
q
uipment
to
IN2.
No
No
No
No
No
No
No
No
No
No
Yes
Yes
JA101
(Pin
15)
SCL
(HDMI
IN1)
DSDA0
DSCL0
E-2
Does
a
clock
output
in
constant
period
(0
to
5
V)
?
Check
the
patterns
and
JA101
in
the
path.
If
JA101
is
failure,
replace
JA101.
Yes
IC152
(Pin
7)
E-3
Is
there
a
same
signal
as
E-1
(0
to
4.4
V)?
Yes
IC101
(Pin
30)
RIPWR
5V
C-4
Is
the
voltage
"H"
(3.3
V)?
Yes
Check
the
patterns,
IC152
or
IC153
in
the
path.
If
IC152
or
IC153
is
failure,
replace
IC152
or
IC153.
IC152
(Pin
4)
E-4
Is
there
a
same
signal
as
E-2
(0
to
4.4
V)?
Yes
Check
the
patterns,
IC152
or
IC153
in
the
path.
If
IC152
or
IC153
is
failure,
replace
IC152
or
IC153.
R167
E-5
Is
there
a
same
signal
as
E-1
(0
to
3.3
V)?
Yes
Check
the
patterns
and
R167
in
the
path.
If
R167
is
failure,
replace
R167.
Check
the
patterns
and
R168
in
the
path.
If
R168
is
failure,
replace
R168.
R168
E-
6
Is
there
a
same
signal
as
E-2
(0
to
3.3
V)?
Yes
Check
the
patterns
in
the
path.
If
Q101
or
R133
is
failure,
replace
Q101
or
R133.
IC101
(Pin
35)
Is
the
voltage
"H"
(3.3
V)?
No
HPDET1
(HDMI
IN2)
Yes
C-2
*
When
connected
the
source
e
q
uipment
to
IN2.
Check
the
JA102.
If
JA102
is
failure,
replace
JA102.
JA102
(Pin
18)
Is
the
voltage
"H"
(5
V)?
No
V+5RI
(HDMI
IN2)
Yes
C-3
Check
the
patterns,
JA301
in
the
path.
If
JA301
is
failure,
replace
JA301.
JA301
(Pin
19)
Is
the
voltage
"H"
(5
V)?
No
HPD
(HDMI
OUT)
D-5