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What is the fourth antenna lead that connects to the wi-fi card?

Hi. There are four antenna leads that connect to the wi-fi / airport card in my Macbook Pro. While three of them are part of the Airport antenna assembly and can be easily replaced, the fourth, longest lead seems to originate from a mooring at the uppermost left of the Mac's bottom casing itself. I've damaged the delicate connector and need to replace it, but I don't know what the lead is called, what it does, or how to source a new one and effect the repair. Can anyone help?

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I figured it out. It is in fact the Bluetooth antenna, and it is indeed a separate module to the wi-fi assembly: https://www.aliexpress.com/item/New-Blue...

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That is the camera cable.. See this guide:

MacBook Pro 15" Unibody Mid 2012 AirPort/Bluetooth Board Replacement

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HI there. Thanks very much for your reply. I'm still confused though: I just tested the camera using Photo Booth and it's working fine, despite the fourth lead being broken / disconnected. I've just ordered a new antenna assembly, but that only has three connectors on it, whereas this fourth connector is an independent lead. All advertised replacements say 'ISight/Wi-Fi/Bluetooth Antenna assembly' but none of them appear to include this lead. The teardown description doesn't mention it either. All it says is 'remove the four antenna cables'.

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Sounds like you ordered the wrong part. Is the cable connector broken or the board?

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The board is fine. I damaged the connectors while replacing the optical drive a few days ago - it's necessary to remove the Airport card before removing the optical drive. I'm pretty sure I ordered the right part - I checked it against the model mumber - A1286 - and that it was a fit for a mid 2012 15" Unibody Macbook Pro. http://www.ebay.co.uk/itm/121718165508?_... As I said, the fourth connector appears to originate from a mount on the casing of the Mac that is separate from the other three connectors.

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Ditkoman will be eternally grateful.
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