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VSX-LX70
62
1
2
3
4
1
2
3
4
C
D
F
A
B
E
TROUBLESHOOTING THE NETWORK BLOCK
Insert the connectors securely.
CN801, CN901(FFC)
No
Yes
Check the parts and patterns in
the path.
CN901 (Pins19-22)
5V input
1
No
No
Yes
Check the DIGITAL
MOTHER Ass
'
y
Yes
To STEP 2
Are the
connectors
securely
inserted
?
Is the
voltage 5V
?
Step 1:Connectors
Step 2:Power supply
Is there
any loose
connection of
CN901
?
IC11 (Pin 2)
3.3V Regulator IC input
2
3
No
Yes
Is the
voltage 5V
?
Check the parts and patterns in
the path.
IC801 (Pin 5)
USB Power SW
4
No
Is the
voltage 5V
?
Check the patterns inthe path.
IC31 (Pin 2)
No
Yes
Yes
Is the
voltage 5V
?
Check the parts and patterns in
the path.
Check the parts and patterns in
the path.
IC701 (Pins 3,16,32,43,55,61,78,89,103,
113,125,136,151,158,176,192,201)
NETWORK Media
processor IC
9
No
Yes
Is the
voltage 3.3V
?
IC861 (Pins 14, 36, 48)
No
Yes
Is the
voltage 3.3V
?
Check the parts and patterns in
the path.
IC881 (Pins 37,47)
FLASH ROM
6
No
Yes
Is the
voltage 3.3V
?
Check the parts and patterns in
the path.
IC891 (Pins 1,3,9,14,27,43,49)
SDRAM
7
No
Yes
Yes
Is the
voltage 3.3V
?
Check the parts and patterns in
the path.
IC911 (Pin 14)
5-3 Converter
8
No
Is the
voltage 3.3V
?
To STEP 1
IC11 (Pin 4), IC21 (Pin 2)
3.3V Reg. output/1.8V Reg. input
5
No
No
Yes
Replace IC11.
Yes
Is the
voltage 3.3V
?
Is IC11
abnormally
hot
?
The output and GND may be
short-circuited. Check the path
between them.
A
IC21 (Pin 4)
1.8V Regulator output
10
No
Yes
Is the
voltage 1.8V
?
No
Replace IC21.
Yes
Is IC21
abnormally
hot
?
The output and GND may be
short-circuited. Check the path
between them.