Samsung g7102 touch not working

i got the samsung grand-II G7102 with crack touch plate n lcd belt tored(mobile fell down)….got the new lcd n touch,checked before fitting all worked good-touch n lcd…..after assembly stopped working…. got the other new lcd n touch plate but touch not working….everything seems well on pcb. dont know what happend a sudden, first time its worked then stopped…….and now confused what to do now…..anybody please guide me the solution:confused::confused: