Power On Trouble - Bcm Booting Trouble - LG FM300 Service Manual

4.2 Power on Trouble – BCM Booting Trouble
TP1
SWREG_PDRIVE
TP2
SWREG_NDRIVE
SWREG_VFB_SEN
VCNTL
VSENSE2P5
LGE Internal Use Only
VDD_3.3
S1 S2 S3
R140
G
1 Q102
TP1
SI7403BDN
EBK61473001
D1 D2 D3 D4 D5 D6 D7
D1 D2 D3 D4 D5
Q103
SIA426DJ
EBK61591901
R141 G
TP2
1
S1 S2
VDD_3.3
TP4
R152 0
2SB1424
TP4
EQBP0008701
R154 0
TP5
C149 C150
0.1u 10u
TP5
- 7 -
4. TROUBLE SHOOTING
C133 C134
10u 0.1u
TP3
L102 3.3u
NR5040T3R3N
EAP61746101
C135
22u
R144 0
C139
0.1u
VDD_2.5
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4. TROUBLE SHOOTING
TP3
VDD_1.2
C156 C136 C111
22u 22u 1u
Only for training and service purposes