Here's a Repair Guide on Nokia 5800 XpressMusic Insert Sim Card Problem Issues. But before proceeding to this hints make sure that you already done the basic method on how to deal insert sim card related common problem. Just make sure that the pin connectors also been cleaned properly before doing this procedures below.
This simple steps will help how to solve insert sim card problem issues on Nokia 5800 xpressmusic, but might also will not, if the trouble occurs deep within the PCB board line paths or the Integrated IC itself (Avilmas,power management IC)..
The nokia 5800 xpressmusic sim card line paths is connected directly to power management IC, except for the power supply voltage line which is always have the open test spots where we can check and test.
As I've already been discussed here that the simcard pins connection is composed of 6 connectors where:
SIM Data, SIM Clock, SIM Reset, Supply Voltage and a Ground and the other pin is left unconnected.
The repair guide picture below based on the circuit's Schematic Diagram, and the tracing line that only available for check up is the Vsim that supply power voltage to the sim card's Pin 3.