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3.19 The M/B leakage of electricity
The M/B leakage of
electricity
Plus electricity but does not boot,
then observing whether there is a
large leakage current
Open the phone, Plus electricity and
boot it, then Touch all parts of the
PCB board, if there is a serious device
temperature rises to initially
determined the approximate location
Gradually remove each connected
by a connector or connect various
peripherals from the FPC, LCD,
camera, etc., to see whether the
leakage power on the motherboard
Screening with a multimeter
power of each module to ground
resistance, resistance screening
out smaller power supply
network
After replacing the relevant module
IC and power supply filter capacitor
leakage has disappeared
Change PMIC
N
N
Y
N
Y
N
N
Electric leakage can be
Y
determined on VBAT
which is supplying the
battery power directly
Y
Screening of temperature
rise is larger device,
determine the short circuit
of power supply network
peripheral modules leakage of
electricity, replace it
peripheral modules leakage of
electricity, replace it
Screening the module
PA, backlight driver
and so on that VBAT
supplying the battery
power directly, or
directly take off, to
determine leakage
module
33
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