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Possible to replace Thunderbolt port?

MacBook Air 13" Mid 2011 running 10.9.1. Thunderbolt monitor working consistently well. But when I use Thunderbolt > VGA cable connections to various monitors/projectors it is unreliable; sometimes signal repeatedly dies, sometimes monitor doesn't detect at all, while other laptops work fine. Have tried different cables. Evidence of slight corrosion in one corner of the port.

Questions:

  1. Does it make sense that Thunderbolt monitor would work but that there would be issues with Thunderbolt>VGA monitor connections?
  2. Is it possible to replace Thunderbolt port without replacing entire logic board?
  3. Do USB>VGA options work with Macs; if so, do they carry audio?

Many many thanks for any advice.

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First I would check the EFI & Thunderbolt firmware updates Apple has to make sure your system is up to date.

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If these don't address your problem you'll likely need to get a new logic board at the connector is soldered on to it - Ouch!

I would also check with a genus at an Apple Store or visit a Apple authorized service center. To check your software setup.

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Ruth will be eternally grateful.
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