Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB DDR5 Video RAM

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Bluetooth unavailable + Screen flicker on MBP mid 2012

Eek! A few weeks ago (right after I discovered the data-& energy-saving “tether via bluetooth” function on android, sigh..) I found that my MBP showed me the “bluetooth unavailable” symbol in the icon bar: A greyed out icon with a sawtooth wave on front of it. I could not connect to any device, no submenu is shown.

But: this does occur randomly! So I guess this is some hardware defect?

Additionaly, recently when I opened the MBP, the screen would flicker initially (not the green-stripe flicker, but some flashing, then grey/white noise, then the standard screen, with the “BT not available” symbol.

Is the BT antenna somewhat connected to the screen cable? Is there something I can do to fix the BT issue and to prevent things getting worse?

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Solución Elegida

Bluetooth and screen cables share the same pathway where the LVDS display cable as well as the Bluetooth/WiFi antenna cables pass on their way to the lid assembly. Your issue might indicate the plastic clutch cover has been bumped at some point and/or cables inside might have been partly damaged or dislodged. Check the clutch cover for signs of impact. You might just have to replace the cables as well.

Review this IFIXIT guide MacBook Pro 15" Unibody Mid 2012 Display Replacement

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You'll likely need to replace the hinge with its cables.

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Yeah cool that indication already helps a lot. Any hints where to get hinge and cables? Is there a dedicated source for these parts (preferably in the EU) - or do I have to hunt broken devices to get such a part?

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@arbaman which step do you refer to when you say "plastic clutch cover"? I can see the antenna sockets here MacBook Pro 15" Unibody Mid 2012 Display Replacement in step 10, but i guess you mean some different part, right?

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As it seems we don't have a similar guide for i5/i7 A1286 models you may use as a guideline this guide from the 2010 core2duo model which is pretty much the same to reach and remove up to the clutch cover MacBook Pro 15" Unibody Mid 2010 LCD Replacement. Under the plastic cover you will find the cables and the WIFI/Bluetooth antenna and relevant connector as shown in the guide at steps 31/32. Unfortunately replacement of LVDS cable would require removing the screen glass to access the other end of it on the lcd panel, thus I hope that one has not been damaged. For testing purposes you can screw back your screen temporarily without the cover, being careful not to incidentally short anything in the process. In case both cables are damaged and you don't feel like removing the screen glass a full assembly replacement might do the job more easily but at a price. Parts should be available here on iFixit store (that has a EU branch too) or can be googled around the usual places.

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