Display dont work please help

hello! I have LG G2 mini.... i drop it and i crash a display. so i buy a new one change but its still not work. ok i think its becose i send it from ebay. so i go to the mall and bay a new. i pay 63EUR for new display. i come home but its still not work. touchscreen work. i fill a vibration and sound when i touch, but display are total black... what shud i do? my phone dont be in water so alcohol dont help. maby lg g2 mini have backlight fuse who need repair?? if have where i can fiend it?? that way i repayr my psp. wait a answer tnx :)

p.s sorry for my english i hope u understand what i want to say :)