45
SC-LX81
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Step 4-1: Power supply
Step 4-2: VIDEO INPUT
K6
Is the voltage
1.8V?
No
Check the patterns in the path
Check the L403.
No
Replace L403.
3.3V(VIDEO DEC)
V+3DE
Is the voltage
3.3V?
No
1.8V(VIDEO DEC)
*CN6009 is on
COMPNENT ASSY.
Check the patterns in the path
Check the L401.
No
Replace L401.
3.3V(VIDEO DEC)
K1
Is the voltage
3.3V?
No
Check the patterns in the path
Check the L404.
No
Replace L404.
3.3V(IC402)
K2
Is the voltage
3.3V?
No
Check the patterns in the path
Check the L405.
No
Replace L405.
3.3V(VIDEO DEC)
K3
Is the voltage
3.3V?
No
Check the patterns in the path
Check the L406.
No
Replace L406.
3.3V(VIDEO ENC)
K4
Is the voltage
3.3V?
No
Check the patterns in the path
Check the L601.
No
Replace L601.
3.3V(VIDEO ENC)
K5
Is the voltage
3.3V?
No
Check the patterns in the path
Check the L602.
No
Replace L602.
Yes
1.8V(VIDEO DEC)
V+1R8DE
Is the voltage
1.8V?
No
Check the patterns in the path
Check the L402.
No
Replace L402.
CN6009(Pin 24)
COMPOSITE IN
L1
Is there a
composite
signal?
No
Diagnose the COMPOSITE S
Assy
Yes
CN6009(Pin 20)
SY IN
L1
Is there a
Y signal?
No
Diagnose the COMPOSITE S
Assy
Yes
CN6009(Pin 18)
SC IN
L1
Is there a
C signal?
No
Diagnose the COMPOSITE S
Assy
Yes
CN6009(Pin 12)
COMPONENT Y IN
L1
Yes
L404
Yes
L405
Yes
L406
Yes
L601
Yes
L602
Yes
L402
L403
L401
Is there a
Y signal?
No
Diagnose the COMPONENT
Assy
Yes
CN6009(Pin 10)
COMPONENT Cb IN
L1
Is there a
Pb signal?
No
Diagnose the COMPONENT
Assy
Yes
CN6009(Pin 8)
COMPONENT Cr IN
L1
Is there a
Pr signal?
No
Diagnose the COMPONENT
Assy
Yes
G
Video converter section