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First, check cables which connect with PSUˈthen check as follows
1) Check input voltage
voltage: +5VSBĺPOWER ON(5V) ĺ+12Vĺ5V
connector: CN4(P1) ĺ CN4(P13) ĺCN5(P1,P2,P3) ĺCN4(P2,P3,P4,P5) ĺCN4(P12) ĺCON4(P14)
2)Check output voltage
voltage: Vblon ĺ+5VĺVipwm
connector: CN4(P12) ĺJ28(P26-P30) ĺCON4(P14)
CN4 CN5
ON - 2.0 - 5.0 V
On/Off Control
Voltage
OFF
VBLON
- 0 - 0.8 V
MAX 3.0 3.15 3.3 V Maximun duty ratio Internal PWM
Control Voltage
MIN
VIPWM VSEL=L
0 - V Minimum duty ratio
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