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First, check cables which connect with PSU，then check as follows
1) Check input voltage
voltage: +5VSB→POWER ON(5V) →+12V→5V
connector: CN4(P1) → CN4(P13) →CN5(P1,P2,P3) →CN4(P2,P3,P4,P5) →CN4(P12) →CON4(P14)
2)Check output voltage
voltage: Vblon →+5V→Vipwm
connector: CN4(P12) →J28(P26-P30) →CON4(P14)
CN4 CN5
On/Off Control
Voltage
Internal PWM
Control Voltage
ON
V
OFF
BLON
MAX
V
V
IPWM
MIN
-
2.0
-
-
0
-
=L
3.0
3.15
SEL
0
54
5.0
V
0.8
V
3.3
V
Maximun duty ratio
-
V
Minimum duty ratio
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