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03-12-2017, 18:33
| #1 (permalink) |
| Major Poster  Join Date: Nov 2011
Posts: 48
Member: 1695219 Status: Offline Thanks Meter: 16 | lumia 925 dead / after 30 seconds battery drops to 1V have a dead logic board here - no charging (0 Amps consumption) no power. new battery on actual 4V - no power following vbattery from x2002 over v4290 - caps 2001 2002 4207 4208 over to pmic n4200 ---> 4 V for 20 or 30 seconds then drop to about 1 V something ( only battery plugged in the board and no power on attempt) or before 30 seconds just measure any other component around n4200 / close to c4208 ( eg L4202 ) and then measure right again vbat ( eg on c4208) same voltage drop but immediately without waiting 30 seconds no shorts to gnd on vbat - desoldered v4290 --> no change in behavior reflowed n4200 --> no change desoldered n4200 ---> no voltage drop on its own ( also not after 4 minutes) but right after measuring any other component around ( as I did before and said above ) voltage drop to ( this time !!) 2.8V any ideas ? thx |
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