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2017年9月22日发售。型号有A1864,和A1897，可选GSM 和 CDMA 网络，存储有64GB和256GB，颜色有金色、银色和深空灰色。

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How to fix carrier issue in logic board in 8+

Hello, I changed back glass of iPhone 8 plus. after changing it, I have a new problem which says NO SERVICE (with “!” mark inside a triangle ). I cannot receive or make calls or access any data until i make an update. I checked it in apple support and it says there is a problem within, so i need to fix it. So, anyone please have details or a video how to fix No service from logic board? Thank you so much in advance. and I’m indeed eternal grateful to you.

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If you had to replace the back housing I would think the iPhone took a bad hit and it would be quite likely the issue was already there before replacement and/or the handling of the board made the damage just evident. No service flag with request to update is typical of a hardware damage to the logic board where the processor can’t find the baseband. It could be due to a number of components and will require deep microsoldering skills to be fixed. The only thing you can try is a DFU restore, but there are serious risks it won’t complete and phone will be stuck in restore mode until fixed.

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The SIM socket is located on the logic board as marked here in Purple

Block Image

You need a SIM held within it to tell the radio what bands your cellular carrier uses and can identify your phone.

If your SIM socket is damaged and/or the cellular radio logic is damaged as well as the connections to the antenna units then you can encounter inability to connect to the network.

Breaking parts is always a bad sign. Post a clear picture showing the damage and leverage the pictures within the iFixit teardown iPhone 8 Plus 拆解 to identify the broken part/s so we can see more clearly what you are facing post a marked up picture as well 在已经存在的问题里加入图片

iFixit图片

指南

在已经存在的问题里加入图片

难度：

非常容易

—

2 - 5 minutes
iPhone 8 Plus图片

指南

iPhone 8 Plus 拆解

难度：

中等

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hello thanks fr ur reply., it says "mobile data update failed".

your iphone cannot make and receive calls or access mobile data until it has updated

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Can you identify the part you broke - Picture please

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Try these steps:

  • Turning off Wi-Fi calling and Voice LTE may fix the problem
  • Open Settings and tap Cellular -> Wi-Fi Calling. Turn off the switch next to Wi-Fi Calling on This iPhone to turn off Wi-Fi Calling and go to Settings -> Cellular and tap Cellular Data Options. Tap Enable LTE -> Data Only to turn off Voice LTE. You’ll know Voice LTE is off when the blue checkmark appears next to Data Only.
  • Turn Airplane Mode Off And Back On
  • Turn Cellular Data Off And Back On
  • Check For A Carrier Settings Update open Settings and tap About to check for a carrier settings update. If an update is available, a pop-up will appear within about ten seconds.
  • Eject your Sim Card and Turn off Your Phone Once the device has been powered down reinsert the SIM and then power the device back up.
  • Reset Your iPhone’s Network Settings
  • Put Your iPhone In DFU Mode

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thank you, brother, for your reply, but i replaced the back glass myself and then it turned like this. and i settings about and in the carrier it says "no carrier" I tried all the above but still no use. do you think logic board has the problem?

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i aleady change all housing body and now i have very low signal sometimes it says no service sometimes work good i open the iphone and hold with finger in the simcard socket and now works better but again i have sometimes problem i dont know what to do .

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