If I post only the parts whit SD use, can be?
No. You can use the Additional Options... link to attach the file.
Paul, Do not take it personally, but I'm developing this commercial device for a client and I'm afraid to provide the code on the internet, I hope you understand me.
However, if the program IS very large, and you are running it on a UNO, with 2K of SRAM, then the SD class is using 1/4 of that just for the buffer to write to the SD card. And it is very likely that you don't have enough memory.
Not only SdFat.h, but LiquidCrystal_I2C.h + wire.h + EEPROMEx.h
You could upgrade to a Mega, or you could post your code. Posting your code is cheaper and quicker, but may not be the final solution. Upgrading may be required.
I´m tested on Mega right now, and works fine, but whit uno I can make it stand alone, using mega will be more expensive.
I will keep brushing bits, if not work I will try it http://arduino-related.livejournal.com/1414.html?thread=902