Make sure that the device is Samsung Galaxy Y (it`s joke ok )
Here`s the tool, screwdriver plus and minus
Open the rear case and loose the bolts
Push or poke in the rear body at right area as shown above
The rear case will lift and makes a gap between rear and front case
Carefully separated the rear case from the clasp area
above: sparated rear case and main body
Then to disassamble between pcb area and LCD, do like the picture above
There`s 2 connector between pcb and lcd, watch it carefully
Unplug the connectors
Galaxy Y is disassambled (at left to right: back case, main pcb, LCD
See the gold like part? it`s the expesive part from samsung galaxy y, be carefull when you remove it from LCD
Do With Your Own Risk credit to ardhieandreas