LG KP500 inset sim help............

[joel_tech]

hello guys please any one help me to fix my LG KP500 insert sim i already try different sim and resolder the pins but no lock please give me an idea or solutions thank a lot........

[KorAll]

Originally Posted by joel_tech

hello guys please any one help me to fix my LG KP500 insert sim i already try different sim and resolder the pins but no lock please give me an idea or solutions thank a lot........

1. Check Vsim - 2,9 volt at C226. As you can see (on the oscilloscope screen) it is very short signal (~70 m/second).
You can check it when you turn on phone, CPU show this signal when try find out sim card, if unsuccessful, CPU remove this signal.



2. Check SIM_CLK, SIM_RST, SIM_IO ways using m/meter. M/meter mode - diode check, positive wire to phone ground, negative wire to appropriate signal point.

[joel_tech]

this solution give me an idea thank a lot boss KorAll........keep sharing and helping us......