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4. Power on problem
Check
SW501,R571,C76,U10
5. Power line problem
Power line problem
+3V = 3.3V?
Y
VTT = 1.5V?
Y
VCC_CORE
1.6V?
or
VCC_CORE
1.35V?
Y
System problem
Power ON problem
H8_VDDA = 5V?
N
Y
U10 2pin = LOW?
N
Check
U501,U512,D17,C161
N
3.3V/5V/12V problem
N
VTT problem
N
VCC_CORE problem
5/30
Y
U16 7pin becomes
low by Power SW
Y
MCU clock OK?
(U16 2,3pin)
N
Check
X1,R115,C151,C155
N
Check SW1,R504,C505
Y
Power line problem
4/30
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