Huawei u8800 - No Power on

U8800 Maintenance Manual Basic Version V1.1 Internal
2011-03-21
Huawei confidential. No spreading without permission. Page 33 of 61
9.2 No Power on
9.2.1 No Power on---High current
Analysis：The current is above 500mA as power supply by DC-power. Short circuit of VBAT signal or
VPH_PWR signal causes high current usually. Reference Figure 9-1
High current
Check J1501& J1102 whether
it is damaged?
Check U1001 whether
it is short circuit？
Check
U3302&U3402&U3501Whethe
r it is short circuit?
N
Replace the U1001
Y
Check U301 whether it is short
circuit?
N
N
Replace the U201
N
Replace faulty
components
Y
Replace the U301
Y
Replace the faulty
components
Y