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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 7 / iPhone 7 Plus

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Old 08-20-2021, 11:50   #1 (permalink)
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Exclamation iPhone 7 'Device Unknown'


Hey guys, wondering if anyone here experienced similar problem with iPhone 7.



After erasing the phone, it shows Device Unknown when on the activation screen after the phone setup. Also, it doesn't recognize the charging cable/not charging and shows 'Searching/no IMEI'.


Could it be just a bad Tristar or the BB/RF_PMU is also broken?
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Old 08-29-2021, 20:18   #2 (permalink)
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Update, it was a partial short on C2927 (PP3V0_PROX_CONN) which caused the problem.
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Old 08-30-2021, 14:45   #3 (permalink)
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check voltage pm9645
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