I understand your point. But it may be due to moisture. And this is carbon layer on it. Also it is far away from motor controller IC. When I unscrewed the pcb, there was no single drop of any liquid.

Is there anyone who found the solution to repair this??

You can try to read the flash ROM. If that succeeds, then that will prove that the MCU is not brain dead.

It's a very long thread, but there are two methods to read the ROM:

http://www.hddoracle.com/viewtopic.php?f=3&t=1983

_________________
A backup a day keeps DR away.

can i use 2060 701590 001 pcb in replace of 2060 771640 003 pcb

pvprashant1803,
No,
CPU different.