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Información y guías de reparación para el iPhone 6 que salió a la venta el 19 de septiembre de 2014. Números de modelo: A1549, A1586 y A1589

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Always "No Service" after working for several hours

The phone otherwise works fine, has not been dropped or damaged, and has not been opened. Consistently, after working for a couple of hours, I lose the network signal and get a “No Service” message. I have replaced the SIM card, ensured the SIM card tray is straight, cleaned the SIM card receiver, confirmed that the IMEI is displayed (suggesting the baseband IC is okay), performed a hard reset, and performed repeated network resets (yes, probably redundant to the hard reset). The thing that is crazy-making is that it works, and then only after a couple of hours does it lose the network — and this is regardless of whether the phone is in use or not in use, so it is not a question of heat causing a light solder fracture to separate. ANY IDEAS?

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After you have eliminated antennae or network locks as the possible culprit, searching issues on the iPhone 6 are usually related to the baseband IC. The baseband IC, just like the Touch IC's on the 6 Plus suffers from poor quality traces and pads that crack over time due to micro-flexures of the housing.

Seeing as how you have already tested to see if the IMEI is displayed, I would encourage you to read Michael’s answer here (Service is "Searching" indefinitely) (by @teetopp) as it summarizes the issue really well and points to other possible causes beyond just the Baseband IC.

The reality is that the iPhone 6 suffers from many logic board issues and considering the age of these devices, those issues are making their presence felt more and more. You will most likely need some kind of micro-soldering repair so you’ll have to determine if it is an investment you’re willing to make.

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Thank you for a truly thoughtful and cogent response. In summary, it seems like your suspicion is that even though the Baseband IC is good, another logic board component micro-fracture would likely be responsible. However, does this theory take into consideration the fact that the phone works for a couple of hours before it fails? One might think the failure could happen at any time, but that it consistently fails after a couple of hours seems curious. Do iphones do some sort of operation, or do networks do some sort of operation, after a phone has been newly-put on the network after a couple of hours?

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It's hard to say but it could be related to specific heating of the offending IC, which only gets hot enough after a period of time before failing.

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