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IPhone 8 Stuck in Searching or No Service Repair

From Repair Wiki
IPhone 8 Stuck in Searching or No Service Repair
Device iPhone 8, iPhone 8 Plus
Affects part(s) Motherboard
Needs equipment microscope, soldering equipment
Difficulty ◉◉◉◌ Hard
Type Soldering


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Problem description

How to fix an iPhone 8 or iPhone 8 Plus that has no cell service.

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Symptoms

If no previous repairs attempts were made on the phone but these symptoms are present:

  • With no SIM Card installed, the phone is always "Searching..." or "No Service".
    • A working phone will show "No SIM" with no SIM Card installed.
  • Dial *#06# in the phone app and nothing happens
    • A working phone with no Baseband issue will make the IMEI pop up.
  • If you go to Settings > General > About > Model Firmware is blank

Solution

Intel Model

  • reballing BBPMU_K should solve it.
    • Part# PMB 6848

Qualcomm Model

  • Replacing U_PMIC_E (aka BBPMU) should solve it
    • Part# PMD 9655

Please note: If you attempt the above repairs but the phone is still stuck in "Searching..." or "No Service", then flash an update (DO NOT RESTORE). This can sometimes solve the issue. Not sure why it is needed sometimes.

If a phone with a baseband problem is restored, then the iOS software will "erase" the IMEI (baseband info) in the phone and will require the board issue to be fixed, then restored again, so the software will bring back the IMEI.

If you restore, and still has no IMEI, then a baseband/board issue is still present on the board. That will need to be fixed, then restored again.