Unplug system, remove base cover and disconnect the battery.  Hold the power button for 30 sec.  Remove and reinstall both memory modules.  Reconnect the battery and power up again - if the error persists, the CPU is indeed bad.  It's not replaceable -- you'll need to replace the entire system board (the CPU is soldered to the mainboard).  
My XPS 15 9570 doesn't turn on, no display, no keyboard lights, no fans. The power led blinks in the following pattern. 2 amber and 1 white. I understand that this signifies a CPU failure. Is there anyway I can fix this. Any help regarding the topic is appreciated.  PS :- The laptop showed no signs of problems before this issue. No overheating, no slowing down.  
2 amber 1 white blinks