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Flow Chart of Troubleshooting
10-3
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Deduct Power management component damage
VUMTS_2.8V C418
≒
2.8V
VRF_2.9V C413
≒
2.85V
VEDGE_1.5V C412
≒
1.53V
VRF3_BT_1.8V C420
≒
1.8
Resoldering
Each component
VAFC C414
≒ 2.65V
VSIM_2.9V C416 ≒ 2.9V
VAUDIOA_2.5V C422 ≒ 2.5V
Resoldering
Each component
Check operation
Replace U401
C423
C411
C418
C415
VBAT
VAUDIOA_2.5V
C421
C413
VIO_2.62V
L8
CHARGE_UC
L9
SENSE_IN1
L7
CH_CNTRL
K8
CH_SOURCE
K10
SENSE_IN2
J11
VUMTS
H11
VAFC
H2
VAUX
G1
VAUDIOB
G10
VSIM
F10
VRF1
F11
VVIB
F2
VAUDIOA
E10
VRF3
D11
VRF2
C11
VMME
A10
VPLL
A11
VIO
A4
VUSB
C417
C412
C424
VPLL_1.35V
C416
VEDGE_1.5V
C426
VMME_2.9V
C419
VAUDIOB_2.5V
C420
VAUX_2.9V
C427
VRF_2.9V
C409
C422
VSIM_2.9V
C414
C410
VRF3_BT_1.8V
Summary of Contents for SGH-L770
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