8.
SD card not detecting:
Solution:
Flash the handset with latest SW
C
heck if the TF card is obviously damaged,
if yes,
Re-Solder TF connector or change it
Check if the ground impedance of each pin of the TF card socket(except the ground pin)is low(lower than grade ),if
yes,
Replace the
resistor of the corresponding pin;
Check if the series resistors on each network of the TF card have pseudo soldering
,if yes,
Carry out repair soldering
of the series resistors on each signal line;
Check the Power IC normally or not, then Re-Solder Power IC or change it.
Check the CPU normally or not, then Re-Solder CPU or change it.
TF
connector
Power IC
CPU
