iphone 6 plus dead after fall - GSM-Forum

Nspereira · 03-17-2018, 16:04

Hi, i have an iPhone 6 Plus that was working fine and after a massive fall it wont turn on. So i checked the Baterry connector and i get 0.5V in diode mode, checked PP_VCC_MAIN and it's shorted. After visual inspection under the microscope around the caps of the PM IC, PMU, u2, etc i didn't find any discolorated or damaged caps. So i a googled a bit and find that it's common for 6 plus after falling that there can be damaged caps near the backlight circuit and that those damaged caps shud release a soldering ball if dead, so i inspected under the microscope and found like 5 or 6 caps and diodes with those soldering balls, my question is ALL of the caps and diodes that release that soldering ball are really dead or should i take them out and test one by one to see if their indeed damaged or working?

Thanks!

Nspereira · 03-20-2018, 14:33

Can someone help?
thanks

elecsoluces · 03-20-2018, 14:53

Hello,

You have to remove one by one all the caps and all the circuit who have a path to ground on the VCC MAIN line.
First test the caps one by one before testing IC.

ninos22 · 03-20-2018, 23:02

Easy way to find VCC_MAIN short is to jumper Q1403 (VCC_MAIN/BATT_VCC).

Feed with power supply battery connector (start with 1.00A up to 2.00A).

Freeze board with freeze spray and heated parts it will show up easily.

03-17-2018, 16:04	#1 (permalink)
Nspereira Junior Member Join Date: Jan 2018 Posts: 10 Member: 2804674 Status: Offline Thanks Meter: 0	iphone 6 plus dead after fall Hi, i have an iPhone 6 Plus that was working fine and after a massive fall it wont turn on. So i checked the Baterry connector and i get 0.5V in diode mode, checked PP_VCC_MAIN and it's shorted. After visual inspection under the microscope around the caps of the PM IC, PMU, u2, etc i didn't find any discolorated or damaged caps. So i a googled a bit and find that it's common for 6 plus after falling that there can be damaged caps near the backlight circuit and that those damaged caps shud release a soldering ball if dead, so i inspected under the microscope and found like 5 or 6 caps and diodes with those soldering balls, my question is ALL of the caps and diodes that release that soldering ball are really dead or should i take them out and test one by one to see if their indeed damaged or working? Thanks!

03-20-2018, 14:33	#2 (permalink)
Nspereira Junior Member Join Date: Jan 2018 Posts: 10 Member: 2804674 Status: Offline Thanks Meter: 0	Can someone help? thanks

03-20-2018, 14:53	#3 (permalink)
elecsoluces Major Poster Join Date: Feb 2018 Location: FRANCE Posts: 45 Member: 2816075 Status: Offline Thanks Meter: 8	Hello, You have to remove one by one all the caps and all the circuit who have a path to ground on the VCC MAIN line. First test the caps one by one before testing IC.

03-20-2018, 23:02	#4 (permalink)
ninos22 Freak Poster Join Date: Mar 2013 Location: Greece Age: 35 Posts: 425 Member: 1903358 Status: Offline Thanks Meter: 146	Easy way to find VCC_MAIN short is to jumper Q1403 (VCC_MAIN/BATT_VCC). Feed with power supply battery connector (start with 1.00A up to 2.00A). Freeze board with freeze spray and heated parts it will show up easily.