Micromax Q452, Руководство по обслуживанию

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7. SIM not detecting:
Solution:

Flash the handset with latest SW

C
heck if the
SIM
card is obviously damaged, if yes, Replace the SIM card socket

Check if the ground impedance of each pin of the SIM 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
SIM
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.
.
SIM
Connector
CPU Power IC