31
SC-LX81
5
6
7
8
5
6
7
8
A
B
C
D
E
F
• It is assumed that there is no loose connection or damage in the LCRs.
• Refer to "DIGITAL MOTHER Assy Check Points (DSP Section)" as the parts marked to in the troubleshooting are located.
1) Simplified diagnosis
DSP block malfunction is detected.
(The part can be roughly expected just by operation of the main unit.)
• Has DSP block caused the malfunction?
Inputing a 2ch PCM (such as CD) digital signal, check if the sound plays by switching AUTO SURR / STREAM DIRECT.
W
hen the sound doesn't play in AUTO SURROU
N
D or DIRECT MODE though it does in PURE DIRECT (PCM
DIRECT) MODE, DSP block might be defective.
Step 2: Power supply
Step 1: Connections
C
N
2005, C
N
2006,C
N
2007,
C
N
200
8
,C
N
2402,C
N
2403,
C
N
2901,C
N
2902,C
N
2903
Are the
connectors securely
inserted?
Insert the connectors
securely.
Connection with
I
N
TERFACE Assy.
Connection with
COMPO
N
E
N
T Assy.
Connection with
DISPLAY Assy.
Connection with
HDMI Assy.
Connection with
FRO
N
T-I
N
Assy.
N
o
C
N
2403 (Pins 1-3)
IC2710 (Pin 2)
Is the voltage
6
V
?
N
o
6
V
input
1st, 2nd Block 3.3
V
N
o
Replace C
N
2403.
Check the output from the
DCDC Assy.
Yes
Replace IC2710.
Yes
Is there
any loose connection
at Pins 1-3 of
C
N
2403?
Is the voltage
3.3
V
?
N
o
N
o
The output and G
N
D may be short-
circuited. Check the path between
them.
Yes
Yes
Is IC2710
abnormally hot?
A
Yes
Is the
FFC securely
inserted?
Is the
FFC securely
inserted?
Is the
FFC securely
inserted?
Is the
cable securely
inserted?
Insert the connectors
securely.
N
o
Yes
C
N
2001
Insert the connectors
securely.
N
o
Yes
C
N
2002
Insert the connectors
securely.
N
o
Yes
C
N
2003
Insert the connectors
securely.
N
o
Yes
C
N
2401
To Step2
A
A
AY
B
IC2701 (Pin 72, etc.) 1st DSP 3.3
V
Is the voltage
3.3
V
?
N
o
Yes
D
C
IC2710 (Pin 4)
1st, 2nd Block 3.3
V
Is the voltage
4.2-4.5
V
?
N
o
Yes
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
IC2704 (Pin 20)
LATCH 1
Is the voltage
3.3
V
?
N
o
Yes
E
2) Troubleshooting
[2] DSP Troubleshooting