VSX-LX50
58
1
2
3
4
1
2
3
4
C
D
F
A
B
E
F
Step 3-1: Power Supply
Video converter section
V+5A
Is the voltage
5 V?
No
5 V (VIDEO BUFFER)
Yes
Yes
Yes
Yes
Yes
Yes
V+5A
Check the patterns in the path
and L1001.
If L1001 is failure, replace L1001.
Step 3-2: Video Input
CN1002 (Pin 1)
Is there a
composite
signal?
No
CVBS IN
Yes
a
Diagnose the MAIN CONTROL
Assy or COMPOSITE Assy.
CN1002 (Pin 5)
Is there a
Y signal?
No
SY IN
Yes
a
Diagnose the MAIN CONTROL
Assy or S-VIDEO Assy.
CN1002 (Pin 7)
Is there a
C signal?
No
SC IN
Yes
a
Diagnose the MAIN CONTROL
Assy or S-VIDEO Assy.
CN1002 (Pin 13)
Is there a
Y signal?
No
Y IN
Yes
a
Diagnose the MAIN CONTROL
Assy or COMPONENT Assy.
CN1002 (Pin 15)
Is there a
Pb signal?
No
Pb IN
Yes
a
Diagnose the MAIN CONTROL
Assy or COMPONENT Assy.
CN1002 (Pin 17)
Is there a
Pr signal?
No
Pr IN
Yes
a
Diagnose the MAIN CONTROL
Assy or COMPONENT Assy.
V+3DE
Is the voltage
3.3 V?
No
3.3 V (VIDEO DEC)
V+3DE
Check the patterns in the path
and L401.
If L401 is failure, replace L401.
3.3V
_
DE1
Is the voltage
3.3 V?
No
3.3 V (VIDEO DEC)
Check the patterns in the path
and L404.
If L404 is failure, replace L404.
3.3V
_
DE1
3.3V
_
EN1
Is the voltage
3.3 V?
No
3.3 V (VIDEO E/VC)
Check the patterns in the path
and L701.
If L701 is failure, replace L701.
3.3V
_
EN1
3.3V
_
EN2
Is the voltage
3.3 V?
No
3.3 V (VIDEO ENC)
Check the patterns in the path
and L702.
If L702 is failure, replace L702.
3.3V
_
EN2
Yes
Yes
IC904 (Pin 1)
Is the voltage
1.8 V?
No
1.8 V (VIDEO DEC)
Check the patterns in the path
and IC905 and IC904.
If IC905 or IC904 is failure,
replace IC905 or IC904.
V+1
R
8VC
1.8V
_
DE1
Is the voltage
1.8 V?
No
1.8 V (VIDEO DEC)
Check the patterns in the path
and L402.
If L402 is failure, replace L402.
V+1
R
8DE
1.8V
_
DE2
Is the voltage
1.8 V?
No
1.8 V (VIDEO DEC)
Check the patterns in the path
and L403.
If L403 is failure, replace L403.
1.8V
_
DE1
* When source is inputted from
Composite.
* When source is inputted from
S-VIDEO.
* When source is inputted from
S-VIDEO.
* When source is inputted from
Component.
* When source is inputted from
Component.
* When source is inputted from
Component.