many reasons are major cause for no display,blank display,scrambled display. In samsing champ duos c3262 no display problem terouble shooting.first connect with charger no charging logo on screen.open your cell phone and clean pcb and lcd connector with corbon tetra cleaner(ctc)dry normal.problem not solve then try seen lcd with lamp if display is shown but no light make light jumper or change lcd.lcd ok and new 100%working condition please be care fully check lcd connector.no display no luck final heat or replace display controller ic.
here is the light ic jumper if your lcd is black and now lights.
click on link for jumper ways by image. Samsung champ duos c3262 no display jumper Phonetolls