I have the same problem and changing the DC-in board did not improve. I'm stuck at around 5 Watts and as we speak, because the computer is doing hard work it's even on 0.04 Watts. Not OK at all..
Musa, have you tried this? I am considering doing the same thing. I did hear that the location of the screws of the heatsink are a bit different though. But maybe you didn't have a problem or found a workaround?