Micromax Q427+ - SD card not detecting; SD Card Detection Troubleshooting

Q427+ L3 Service Manual
8. SD card not detecting:
Solution:
 Flash the handset with latest SW
 Check 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