My samsung f/freezer had frozen up atback of fridge , (stopping water coming out of tap on freezer door). so I defrosted with warm air , now fridge gets cold and not freezer , or freezer gets cold and not freezer , when I first switch it on it works fine for a day or so , even makes ice cubes but then it stops working , and ice cubes melt all over floor , my insuran e has lapsed so need to fix it myself, or get someone in , tried a thermostat, yellow cable black end , mine is blue cable white end, still not working at all wheni replaced this part .any onehelpmepleaseor is itscrap .g.b x