@naresh16 I'm afraid HP neither recommends nor supports changing the motherboard of your device as it may render the device unstable due to incompatibility among other components of your device,
You could check the HP service and maintenance guide for details on the parts tested for your device using the page. 76 Chapter 4 Removal and replacement procedures and if you wish to proceed regardless of the above statement, you may have to do the same at your own discretion and since we don't sell motherboards or CPUs, you may want to get it locally at the online store such as Amazon or eBay, etc...as the part numbers are universal.
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