iPhone 4 won't turn on and really hot when charging - GSM-Forum

Taz9126 · 07-02-2014, 08:27

Hi
I hav an iPhone 4 that won't turn on and also gets hot when charging
I've tried the reset and nothing !
I've tried to put in dfu mode and nothing it fails.
I've tried a new screen , still nothing
I've tried new battery and also tried a new proximity sensor
With no luck !!
I've tried stoppin and starting the apple services in control panel and also reinstalling the drivers, still nothing
Tried a new charging port and nothing works !!
The mother board just above the charge port connected gets really hot when charging so I'm beginning to think this is where the problem lies
Any advice will be appreciated
The only warning I get is when plugged into the comp it comes up with a warning that the USB device has malfunctioned please try unplugging and pluggin it in again
Help please !!! :-(

asalcedo11 · 07-02-2014, 11:05

Hi!

Definetly your problem is in the logic board (the one that gets hot). Look what compenent in the board is the one is getting hot cause probably there is your problem.

Cheers!!!

salisu87 · 07-02-2014, 12:03

pls open and replace the battry it happens to my own too

Taz9126 · 07-02-2014, 13:27

Battery has been replaced thanks
The component getting warm is under the black heat film so means I would hav to effectively open the board up :-0
Bit beyond my capabilities really
Thank you

iphonerepair12 · 07-02-2014, 15:57

Can be a shorted capacitor. Here on the forum you can find some layouts of mostly shorted capacitors. The first step I would take is to test all of these.

You also can confirm a short by measuring the resistance between the - en + of the battery connector on the logic board.

Taz9126 · 07-02-2014, 18:51

Thanks for the advice
Just to update
When plugged into charger it has stopped gettin hot , and now when plugged into the computer it won't even recognise it ! Nothing happens not even an error message :-(
Guess the board or capacitor is goosed !
Prob not gonna be cheap to repair , may just sell it as spares may b best option

shafaqstylo · 07-02-2014, 19:05

First change your charging jack then try it

Taz9126 · 07-02-2014, 23:02

Already tried it thanks ;-)

iphonerepair12 · 07-03-2014, 08:35

Quote:

Originally Posted by Taz9126

Thanks for the advice
Just to update
When plugged into charger it has stopped gettin hot , and now when plugged into the computer it won't even recognise it ! Nothing happens not even an error message :-(
Guess the board or capacitor is goosed !
Prob not gonna be cheap to repair , may just sell it as spares may b best option

Did you measure the resistance between the - and + and the battery connector ? (The 2 pins, one at the left and the other at the right, the 2 in the middle are there for another reason). So you measure the resistance between the 2 pins and let me know. If the resistance is low then there (mostly) is a short on the board somewhere.

Taz9126 · 07-09-2014, 00:34

Hi
Sorry for the late reply , it measures around 35 k Ohms after flucuatimg from 2 k ohms up to bout 200 k ohms
As im not sure if this is normal i will leave it up to your expertise
Thanks
Again

07-02-2014, 08:27	#1 (permalink)
Taz9126 Junior Member Join Date: Jul 2014 Posts: 9 Member: 2214998 Status: Offline Thanks Meter: 0	iPhone 4 won't turn on and really hot when charging Hi I hav an iPhone 4 that won't turn on and also gets hot when charging I've tried the reset and nothing ! I've tried to put in dfu mode and nothing it fails. I've tried a new screen , still nothing I've tried new battery and also tried a new proximity sensor With no luck !! I've tried stoppin and starting the apple services in control panel and also reinstalling the drivers, still nothing Tried a new charging port and nothing works !! The mother board just above the charge port connected gets really hot when charging so I'm beginning to think this is where the problem lies Any advice will be appreciated The only warning I get is when plugged into the comp it comes up with a warning that the USB device has malfunctioned please try unplugging and pluggin it in again Help please !!! :-(

07-02-2014, 11:05	#2 (permalink)
asalcedo11 Junior Member Join Date: Jun 2014 Posts: 3 Member: 2212078 Status: Offline Thanks Meter: 0	Hi! Definetly your problem is in the logic board (the one that gets hot). Look what compenent in the board is the one is getting hot cause probably there is your problem. Cheers!!!

07-02-2014, 12:03	#3 (permalink)
salisu87 Insane Poster Join Date: May 2011 Posts: 70 Member: 1573417 Status: Offline Sonork: to *** b d glory Thanks Meter: 3	pls open and replace the battry it happens to my own too

07-02-2014, 13:27	#4 (permalink)
Taz9126 Junior Member Join Date: Jul 2014 Posts: 9 Member: 2214998 Status: Offline Thanks Meter: 0	Battery has been replaced thanks The component getting warm is under the black heat film so means I would hav to effectively open the board up :-0 Bit beyond my capabilities really Thank you

07-02-2014, 15:57	#5 (permalink)
iphonerepair12 Freak Poster Join Date: Oct 2013 Posts: 105 Member: 2045117 Status: Offline Thanks Meter: 7	Can be a shorted capacitor. Here on the forum you can find some layouts of mostly shorted capacitors. The first step I would take is to test all of these. You also can confirm a short by measuring the resistance between the - en + of the battery connector on the logic board.

07-02-2014, 18:51	#6 (permalink)
Taz9126 Junior Member Join Date: Jul 2014 Posts: 9 Member: 2214998 Status: Offline Thanks Meter: 0	Thanks for the advice Just to update When plugged into charger it has stopped gettin hot , and now when plugged into the computer it won't even recognise it ! Nothing happens not even an error message :-( Guess the board or capacitor is goosed ! Prob not gonna be cheap to repair , may just sell it as spares may b best option

07-02-2014, 19:05	#7 (permalink)
shafaqstylo Freak Poster Join Date: Mar 2008 Location: (•,•) Posts: 113 Member: 727850 Status: Offline Sonork: 100.1625445 Thanks Meter: 3	First change your charging jack then try it

07-02-2014, 23:02	#8 (permalink)
Taz9126 Junior Member Join Date: Jul 2014 Posts: 9 Member: 2214998 Status: Offline Thanks Meter: 0	Already tried it thanks ;-)

07-09-2014, 00:34	#10 (permalink)
Taz9126 Junior Member Join Date: Jul 2014 Posts: 9 Member: 2214998 Status: Offline Thanks Meter: 0	Hi Sorry for the late reply , it measures around 35 k Ohms after flucuatimg from 2 k ohms up to bout 200 k ohms As im not sure if this is normal i will leave it up to your expertise Thanks Again