Macbook Pro Retina 2012 15 failing VCORE

I have a Retina 2012 15' MacBook Pro with a typical problem - failing VCore chip. I replaced the ISL62882C with ISL62882 without "C", but it didnt work. Is there a possibility that it's not compatible with 62882 without "C"? I looked through the datasheets, they are basically the same.