How will I know if my MBP wifi does not work or my router?

My MacBook Pro will connect to a streaming source (like NBC Sports, for example) and send by Airplay to Apple TV, but it restores a flamed low quality sound and picture. Very bad, really. My iPhone from the same source and playing through the same Apple TV works fine. Should I worry that I might need a new card wifi on the laptop. It's a year, by the way.

You can have the updated Mac to the test.

In or out of warranty you can get for free a 'Apple Service Diagnostics' OTC test

Genius of booking http://www.apple.com/retail/geniusbar/

Online https://getsupport.apple.com/GetproductgroupList.action

check the warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

Tags: Notebooks

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