iPhone 7 'Device Unknown' - GSM-Forum

rhwks · 08-20-2021, 11:50

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?

rhwks · 08-29-2021, 20:18

Update, it was a partial short on C2927 (PP3V0_PROX_CONN) which caused the problem.

SAEIDSANGAN · 08-30-2021, 14:45

check voltage pm9645

08-20-2021, 11:50	#1 (permalink)
rhwks Junior Member Join Date: Jul 2020 Location: Europe Posts: 8 Member: 2963882 Status: Offline Thanks Meter: 2	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?

08-29-2021, 20:18	#2 (permalink)
rhwks Junior Member Join Date: Jul 2020 Location: Europe Posts: 8 Member: 2963882 Status: Offline Thanks Meter: 2	Update, it was a partial short on C2927 (PP3V0_PROX_CONN) which caused the problem.

08-30-2021, 14:45	#3 (permalink)
SAEIDSANGAN Freak Poster Join Date: Nov 2011 Location: IRAN Age: 39 Posts: 190 Member: 1691551 Status: Offline Sonork: 100.1622582 Thanks Meter: 53	check voltage pm9645