iPhone 6 High consume on boot then gets normal, during use reboot

[vagner.phillipe]

Hello guys...

I have 3 iPhones with the same behaviour. On boot, they gets over 1.1A on power supply, after that, the consume stays normal, at 0.2A ~ 0.4A, in stand by gets down to 0.016A to 0.030A.

But even then, after some time of use, the phone randomly reboots itself.
It can turn on normally on power supply due to 2A supply, but on the battery with only 1A maximum supply they keep rebooting itself.

Checked some power rails and no short or damaged cap is found, anyone can clarify what rail maybe the cause?
Thanks!

Ps.: VCC_Main had a cap "bottlecaping" the 4.2v line, changed and the rail is ok now, but the problem persists...

[Pallle]

Hello

When you press the power button, the current jump immediately around 0.2A?
If yes, replace U1700.

[vagner.phillipe]

Originally Posted by Pallle

Hello

When you press the power button, the current jump immediately around 0.2A?
If yes, replace U1700.

No, the current grows normally to 0,2A ~ 0,4A.
At some point on the Apple Logo screen, the current goes to 1,1A, then after the sucessfull boot it remais normal...

Some time fiddling with the phone it reboots and everything happens again...

[Kradziej]

Originally Posted by vagner.phillipe

No, the current grows normally to 0,2A ~ 0,4A

200mA-400mA jump thats not normal, change u2

1100mA peak when booting is normal

[vagner.phillipe]

Originally Posted by Kradziej

200mA-400mA jump thats not normal, change u2

1100mA peak when booting is normal

Its not a "jump", as I said, it "grows", the oscilation is normal from 0,2A to 0,4A.
I've never had a phone that peaks at 1,1A in system boot, normally goes to 0,8A max.

How is it normal to peak at 1,1A since the battery just supply 1A? If the logic board doesnt have the supply necessary it shuts off...