VSX-LX50
52
1
2
3
4
1
2
3
4
C
D
F
A
B
E
• The parts marked like in the following chart are located
in "HDMI &DVC Assy Check Points".
Step 1-1: Connections
Step 1-2: Power supply
CN1001, CN1002
Are BtoB
connectors inserted
securely?
Insert it securely.
No
Yes
To Step 2-1: HDMI section
To Step 3-1: Video converter section
V+5
IC901 (Pin 3)
Is the voltage
5 V?
No
5 V
3.3 V
Check the DSP Assy or AUDIO IN
Assy or DC/DC Assy.
Yes
Is the voltage
3.3 V?
No
Check the patterns in the path and
IC901.
If IC901 is failure, replace IC901.
Yes
HDMI section
Common section
HDMI
T
rou
b
les
h
ooting
A
V+5
Step 2-1: Power supply
CN1001 (Pin 26)
Is the voltage
7 V?
No
7 V
Check the DSP Assy or AUDIO IN
Assy or DC/DC Assy.
Yes
V+7D
IC911 (Pin 5)
Is the voltage
5 V?
No
5 V (HDMI OUT)
Check the IC911.
If IC911 is failure, replace IC911.
Yes
V+5
Step 1-3:
R
eset
CN1001 (Pin 2)
Is the voltage
"H" (3.3 V)?
No
HDRST
Check the parts and patterns in
the path.
Check the DSP Assy or AUDIO IN
Assy or MAIN CONTROL Assy.
Yes
O
V+3R3UC
3.3 V (HDMI UCOM)
Is the voltage
3.3 V?
No
Check the patterns in the path and
L501.
If L501 is failure, replace L501.
Check the IC501 or IC502.
If IC501 or IC502 is failure,
replace IC501 or IC502.
Check the Q902.
If Q902 is failure, replace Q902.
Check the IC501 or IC502.
If IC501 or IC502 is failure,
replace IC501 or IC502.
Yes
V+3
R
3
U
C
V+3
R
3VC
V+5HD
R1002
Is the voltage
5 V?
No
5 V
Check the R1002.
If R1002 is failure, replace R1002.
Yes
V+5D
IC151 (Pin 8)
Is the voltage
4.4 V?
No
5 V (HDMI IN1)
Check the D151.
If D151 is failure, replace D151.
Yes
V+5E0
IC171 (Pin 8)
Is the voltage
4.4 V?
No
5 V (HDMI IN2)
Check the D171.
If D171 is failure, replace D171.
Yes
V+5E1
IC501 (Pin 6)
Is the voltage
"H" (3.3 V)?
No
PWRCTL1
Yes
IC501 (Pin 97)
Is the voltage
"L" (0 V)?
No
PWRCTL2
Yes
Yes
A-1
A-2