How much would it cost to fix an Asus G53 laptop?

Ok so this is a G53SW-XA1 Republic of Gaming Notebook that I have and it has some problems like when closing and opening the laptop, the magnetic sensor that is responsible for disabling key function in the closed state does not properly work and also the DC port has become finicky. I have to position the jack of the charger in a way that completes the circuit.