DC
Ͳ
DC CONVERTER CIRCUIT 2
CHECK if the DVDD 3V3
OUTPUT at U104 PIN2
CHECK if the 5V
INPUT at U104 PIN3
1,C130 is short circuit
FAILURE POINT
1.R101,C113,C129 is short circuit
2,IC U104
3.Other DVDD3V3 net
FAILURE POINT
CHECK if the
DDRV(1V5) OUTPUT at
U12 PIN2
CHECK if the 5V
INPUT at U12 PIN3
1.R159,R160 is open circuit
2,C172,C174 is short circuit
FAILURE POINT
1.C173,C175 is short circuit
2,IC U111
3.Other DDRV net
FAILURE POINT
N
N
N
N
Y
Y
CHECK if the
AVDD3V3 OUTPUT at
U109 PIN2
CHECK if the 5V
INPUT at U109 PIN3
1,C111,C131 is short circuit
FAILURE POINT
N
N
Y
1.C122,C166 is short circuit
2,IC U109
3.Other AVDD3V3 net
FAILURE POINT
1.CHECK if the 24V
INPUT at U106
PIN1+Q100 PIN 5?
1,L111,L105 is open circuit
2,C118,C109,C138 is short circuit
3,powerboard failure
FAILURE POINT
1,L106 is open circuit
2,C117,C106,C165,is short circuit
3,IC U106
4.Other 5V net
FAILURE POINT
Y
N
Y
N
CHECK if the 5V OUTPUT from
U106+Q100 OUT,L106
CHECK if the
AVDD1V2 OUTPUT at
U105 PIN2
CHECK if the 3.3V
INPUT at U105 PIN3
1,C133 is short circuit
FAILURE POINT
N
N
Y
1.R100,C112,C161 is short circuit
2,IC U105
3.Other AVDD1V2 net
FAILURE POINT
Y
