LG LG-P715 - SIM Detect Trouble

4. TROUBLE SHOOTING
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Only for training and service purposes
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4.14 SIM Detect Trouble
Sequence of Detecting SIM Detect in P715 is :
The phone reads the information of the SIM card while the phone boot.
(When the SIM card is inserted in the socket, detected by physical contact.)
Insert the SIM card
Change the Main PCB
Detect the SIM card?
Yes
Insert new one,
detect the SIM card?
No
Yes
Is there any soldering problem
with pin of SIM socket
START
Change the SIM card
Resoldering On open pin
Yes
No
No
End