Brother please verify before you travel with it,because what i heard that they asking custom even on used one and it is 45 % of the invoice price,one of my friend took one broken lcd ,i mean it was not working ,he want to repair it in pakistan,but custom people not allowing him to pass it without duty,and at last he thrown it at airport.
one more thing is that if you are sending money to pakistan,then make remittance card from pakistan consulate,with remittance card ,a fixed amount of duty relaxation is there,depends upon card type (silver,gold or gold plus).
please confirm it ,you can google it ....