Pioneer SX-319V-K Service Manual page 25

5
Step 2: Power supply
SUB_ON
CN1002 (Pin 10)
No
Is the voltage
Diagnose the MAIN Assy.
0 to 3.3 V?
Yes
SUB MICOM 3.3V
CN1002 (Pins 1, 2)
No
Is the voltage
Diagnose the MAIN Assy.
3.3 V?
Yes
HDMI_5V
CN1001 (Pin 3)
No
Is the voltage
Diagnose the MAIN Assy.
5 V?
Yes
HDMI_3.3V
CN1001 (Pins 1, 2)
No
Is the voltage
Diagnose the MAIN Assy.
3.3 V?
Yes
SUB MICOM 3.3V
Q1204 (collector)
No
Is the voltage
3.3 V?
Yes
Check the parts and
patterns in the path.
Replace Q1204,
IC1003, etc.
Is Q1405
collector voltage
0 V? (base is 3.3 V)
Check the parts and
patterns in the path
Q1405, Q1204, etc.
5
6
Is Q1204 No
base voltage
2.6 V?
Yes
No
replace Q1405
Yes
6
7
IC1005 (Pin 3)
No
Is the voltage
3.3 V?
Yes
IC1005 (Pin 2)
No
Is the voltage
1.8 V?
Yes
The output and GND may be short-circuited.
Check the path between them.
IC1004 (Pin 3)
No
Is the voltage
3.3 V?
Yes
IC1004 (Pin 2)
No
Is the voltage
1.2 V?
Yes
The output and GND may be short-circuited.
Check the path between them.
To Step 3
SX-319V-K
7
8
HDMI 3.3V
Check the parts and patterns in
the path.
HDMI 1.8V
Is IC1005 No
replace
abnormally
IC1005
hot?
Yes
HDMI 3.3V
Check the parts and patterns in
the path.
HDMI 1.2V
No
Is IC1004 replace
abnormally
IC1004
hot?
Yes
8
A
B
C
D
E
F
25