43
VSX-918V-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
A
Step 2-3: Input selection
Diagnose the MAIN Assy.
Yes
CN1001 (Pin 5)
Is the
voltage "L"
when selecting IN1?
And is the voltage "H"(5V)
when selecting
IN2?
No
SELA
B
Step 2-4: Hot Plug Detect
CN1001 (Pin 7)
Step 2-5: SDA/SCL
HPD_IN
Is the voltage
"H" (5 V)?
Check the JA301.
If JA301 is failure, replace JA301.
Yes
CN1001 (Pin 6)
HPD_SINK
Is the voltage
"H" (5 V)?
Yes
No
No
IC102 (Pin 7)
SDA (HDMI OUT)
SDA (HDMI IN1)
Does
a signal output in
constant period
(0 to 5 V)
?
Check the JA301 and IC102.
If JA301 or IC102 is failure,
replace JA301 or IC102.
No
No
No
Yes
IC102 (Pin 9)
SCL (HDMI OUT)
Does
a clock output in
constant period
(0 to 5 V)
?
Check the JA301 and IC102.
If JA301 or IC102 is failure,
replace JA301 or IC102.
Yes
IC101 (Pin 63)
Is
there a same
signal as IC102-pin 7
when selecting
IN1?
Yes
Check the IC101 and JA101.
If IC101 or JA101 is failure,
replace IC101 or JA101.
Check the IC101 and JA101.
If IC101 or JA101 is failure,
replace IC101 or JA101.
JA101 (Pin 19)
No
HPD0
Yes
JA102 (Pin 19)
HPD1
* When connected the source equipment to IN1;
* When connected the source equipment to IN1;
* When connected the source equipment to IN2;
SCL (HDMI IN1)
No
IC101 (Pin 64)
Is
there a same
signal as IC102-pin 9
when selecting
IN1?
Yes
Check the IC101 and JA101.
If IC101 or JA101 is failure,
replace IC101 or JA101.
SDA_SINK
No
No
SCL_SINK
IC101 (Pin 39)
Is
there a same
signal as IC102-pin 7
(0 to 3.3V)
?
Yes
Check the IC102 and IC101.
If IC102 or IC101 is failure,
replace IC102 or IC101.
Check the IC102 and IC101.
If IC102 or IC101 is failure,
replace IC102 or IC101.
IC101 (Pin 38)
Is
there a same
signal as IC102-pin 9
(0 to 3.3V)
?
Yes
Diagnose the MAIN Assy.
Diagnose the MAIN Assy.
Yes
CN1001 (Pin 4)
Is the
voltage "H"(5V)
when selecting IN1?
And is the voltage "L"
when selecting
IN2?
Is the
voltage 5 V
when selecting
IN1?
Check the IC101 and JA102.
If IC101 or JA102 is failure,
replace IC101 or JA102.
No
Yes
Is the
voltage 5 V
when selecting
IN2?
No
SELB
(0 to 5 V)
(0 to 5 V)