VSX-LX70
54
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Step 4-1: Power supply
Step 4-2: VIDEO INPUT
K6
Is the voltage
1.8V
?
No
Check the patterns in the path
(Check L403).
No
Replace L403.
Yes
3.3V(VIDEO DEC)
V+3DE
Is the voltage
3.3V
?
No
1.8V(VIDEO DEC)
Check the patterns in the path
(Check L401).
No
Replace L401.
Yes
3.3V(VIDEO DEC)
K1
Is the voltage
3.3V
?
No
Check the patterns in the path
(Check L404).
No
Replace L404.
Yes
3.3V(IC402)
K2
Is the voltage
3.3V
?
No
Check the patterns in the path
(Check L405).
No
Replace L405.
Yes
3.3V(VIDEO DEC)
K3
Is the voltage
3.3V
?
No
Check the patterns in the path
(Check L406).
No
Replace L406.
Yes
3.3V(VIDEO ENC)
K4
Is the voltage
3.3V
?
No
Check the patterns in the path
(Check L601).
No
Replace L601.
Yes
3.3V(VIDEO ENC)
K5
Is the voltage
3.3V
?
No
Check the patterns in the path
(Check L602).
No
Replace L602.
Yes
Yes
Yes
1.8V(VIDEO DEC)
V+1R8DE
Is the voltage
1.8V
?
No
Check the patterns in the path
(Check L402).
No
Replace L402.
CN1002(Pin 24)
VCV IN
A2
Is there a
composite
signal
?
No
Diagnose the INTERFACE Assy
or COMPOSITE_V Assy
Yes
Step 4-3: Reset
IC401(Pin 83)
XVCRST(DEC)
L1
Is the voltage
"
H
"
(3.3V)
?
No
Check the parts and patterns in
the path(IC501 - IC401).
CN1002(Pin 20)
VCY IN
A2
Is there a
Y signal
?
No
Diagnose the INTERFACE Assy
or S-VIDEO Assy
Yes
CN1002(Pin 18)
VCC IN
A2
Is there a
C signal
?
No
Diagnose the INTERFACE Assy
or S-VIDEO Assy
Yes
CN1002(Pin 12)
VCCY IN
A2
Is there a
Y signal
?
No
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
Yes
CN1002(Pin 10)
VCCb IN
A2
Is there a
Pb signal
?
No
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
Yes
CN1002(Pin 8)
VCCr IN
A2
Is there a
Pr signal
?
No
Diagnose the INTERFACE Assy
or COMPONENT & VOL Assy
Yes
No
Replace IC501.
G
Yes
Video converter section
