FLY E195, Сервисное меню

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E195 Service Menu
25
Not download
Check whether it is the problems of
allocation of procedure, download cable,
power supply, software, PC phone. Eliminate any reasons
for not download
except the cell phone.
Yes
Check whether the serial port of PC and
cell phone is unrestricted.
Check whether the 8pin
connector USB-CON is
false soldered or
damaged.
NO
NO
Check USB-con
peripheral resistance
NO
Connect the download line and observe the
ammeter whether the current is high
(normal current is generally about 30mA).
Yes
Quickly disconnect the
connection, and touch the chip
gently to see if it is hot, if not,
focus on measuring the
short-circuit point by using
multimeter.
Yes
A little or no current
Check VCORE
、
VDD
、
VADD
、
VTCXO
、
VRTC
、
VMEM
、
measure the clock signals of
26MHZ
、
32KHZ.
Normal current but no download
Check whether CUP and NORFLASH is OK,
LDO is normal?
Check whether the voltage supply of CPU power
manager, PMU and LDO is normal, whether there is
any power supply open circuit.