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My Bluetooth and GPS died
I replaced the "iPhone 6 Logic Board Antenna Flex Cable" on the back of the Logic Board.
It took a long time and patience. The first time I put it back together a vertical stripe of the digitizer did not respond to my finger. I took the phone apart again, and got to the part where you unplug all the screen plugs (one of which is the digitizer.) I brushed the contacts of these plugs with isopropyl alcohol (using a free Sephora mascara brush they give away) and plugged them back together. This time everything worked great!
Keep a piece of paper with strips of double-stick tape to stick the screws or parts for each step, and then write the step next to it. I even placed the screws in the same geometrical pattern that they went into the phone on the tape, so I would remember. Some of the screws and parts help ground things, so put the head of the screws or the outside of the part next to the tape adhesive, so as to not mess up the metal-to-metal clean contact of these parts.
Spotty, if any, wireless and GPS effective radius was about a half mile.
REpair, using the iFixit writeups went well. The problem occurred in reassembly and the multiple ribbon cables from the front screen/digitizer back to the board. Originally, I got a blank screen with lines. Took the phone apart again and reseated everything to get a proper lock screen....but no touch response. Took the phone apart multiple times after that attempting to reseat the ribbon connectors and get the touch screen to work again. In the end, knowing that I had faulty antennae and now a touch screen that wouldn't work, I exchanged it with apple for a new phone. Nothing against iFixit, I probably damaged a connector on a ribbon cable or board with the multiple attempts and the delicate/sensitive nature of the pieces.
Do not force the ribbon cable connections! This is the only thing I can figure that went wrong as it felt like everything seated properly the first time and I had a blank screen. unfortunately, the cable connectors don't provide a confident alignment sense when trying to get everything in and that first cable connector is THE WORST ONE!!
Had really bad bluetooth performance and poor GPS and cell service
extensive, lots of screws to manage but completely doable.
highly recommend this if you have bad bluetooth performance or GPS performance.
Was having issues with my GPS not tracking me and my phone was out of warranty. I did not want to spend $300 on a new phone or even wait for this years new model, so I decided to replace the antenna flex cable, as that seemed to be a possible cause for the GPS issues.
The instructions were super clear and easy to understand. I went slow and made sure to keep all the screws in order and to not break anything. After I reassembled the phone, I turned it back on and still had the same GPS problem. So I opened it a second time and wiped all the connections down with alcohol in case I touched anything with my fingers. I also made sure each connection was tight. After the second reassemble, GPS location got way better, but it didn't totally fix the problem, so there could be another inherent issue with the phone. But everything else is working perfectly, so at least i didn't ruin my phone by opening it and I was able to get it to a much better working order than before, worth the time.
Take your time, make sure every screw goes back exactly where it came from since they are one of a few different sizes. I am happy I was able to at least get the GPS to work more than the majority of the time with this repair and I learned a ton about how to replace iPhone parts. It really was way easier than I thought it would be, especially with the second teardown and reassembly.