Iphone 4 not power on - GSM-Forum

gmarg · 08-08-2014, 08:07

I have recently change a screen in an friend's iphone 4 (i have done it many times) and the phone is not turning on. I am sure that it is not water damaged, i checked it before the screen change and worked OK, screen is working (tried it in another iphone), by inspecting the motherboard in my microscope everything seems to be OK, i checked the continuity of all connector pins according the very good thread http://forum.gsmhosting.com/vbb/f631...ector-1132074/ , tried another motherboard and works OK so there is a motherboard problem, tried to reset it by holdig the two buttons in case there was a software problem but nothing from the above works.
I didn't make any voltage measurements, can anyone help me with these or have an idea in what else can i do?

bajinchi · 08-26-2014, 03:29

I have the same problem, but trying to deal with the audio IC. The iPhone don´t turn on at all, and is only recognized by the computer in DFU mode... Do you have the same symptoms? Find any fix?

newstarmobile · 08-26-2014, 04:31

Quote:

Originally Posted by gmarg

I have recently change a screen in an friend's iphone 4 (i have done it many times) and the phone is not turning on. I am sure that it is not water damaged, i checked it before the screen change and worked OK, screen is working (tried it in another iphone), by inspecting the motherboard in my microscope everything seems to be OK, i checked the continuity of all connector pins according the very good thread http://forum.gsmhosting.com/vbb/f631...ector-1132074/ , tried another motherboard and works OK so there is a motherboard problem, tried to reset it by holdig the two buttons in case there was a software problem but nothing from the above works.
I didn't make any voltage measurements, can anyone help me with these or have an idea in what else can i do?

clean pcb once ,change battery fit porperply and post result br

iqballk · 08-26-2014, 08:50

connect with power supply.. press power once.. post supply readings..

SC400slide · 08-27-2014, 02:49

camera take lots of power unplug camera and make sure emi shield on ipone then check post finding here on forum of ok

sag

gmarg · 09-02-2014, 18:59

Computer doesn't recognize it at all, i cleaned the PCB one more time, changed battery, disconnect camera but still doesn't power up. It seems that the voltage is OK but can anyone post a picture where can i measure voltages. I tried another battery and noticed that it didn't charge it either, so no power and no charging battery. Where can i measure voltages? (can't find a post with some pics)

stormanimal83 · 10-15-2014, 23:07

Found a solution? Same problem here...

08-08-2014, 08:07	#1 (permalink)
gmarg Junior Member Join Date: Feb 2011 Posts: 24 Member: 1511653 Status: Offline Thanks Meter: 0	Iphone 4 not power on I have recently change a screen in an friend's iphone 4 (i have done it many times) and the phone is not turning on. I am sure that it is not water damaged, i checked it before the screen change and worked OK, screen is working (tried it in another iphone), by inspecting the motherboard in my microscope everything seems to be OK, i checked the continuity of all connector pins according the very good thread http://forum.gsmhosting.com/vbb/f631...ector-1132074/ , tried another motherboard and works OK so there is a motherboard problem, tried to reset it by holdig the two buttons in case there was a software problem but nothing from the above works. I didn't make any voltage measurements, can anyone help me with these or have an idea in what else can i do?

08-26-2014, 03:29	#2 (permalink)
bajinchi Junior Member Join Date: Aug 2014 Posts: 24 Member: 2245338 Status: Offline Thanks Meter: 4	I have the same problem, but trying to deal with the audio IC. The iPhone don´t turn on at all, and is only recognized by the computer in DFU mode... Do you have the same symptoms? Find any fix?

08-26-2014, 08:50	#4 (permalink)
iqballk No Life Poster Join Date: Jul 2002 Location: sri lanka Age: 39 Posts: 1,436 Member: 13932 Status: Offline Sonork: 100.1609876 Thanks Meter: 411	connect with power supply.. press power once.. post supply readings..

08-27-2014, 02:49	#5 (permalink)
SC400slide Freak Poster Join Date: Nov 2013 Location: Canada Age: 55 Posts: 159 Member: 2074110 Status: Offline Sonork: 92458589.7230895 Thanks Meter: 10	camera take lots of power unplug camera and make sure emi shield on ipone then check post finding here on forum of ok sag

09-02-2014, 18:59	#6 (permalink)
gmarg Junior Member Join Date: Feb 2011 Posts: 24 Member: 1511653 Status: Offline Thanks Meter: 0	Computer doesn't recognize it at all, i cleaned the PCB one more time, changed battery, disconnect camera but still doesn't power up. It seems that the voltage is OK but can anyone post a picture where can i measure voltages. I tried another battery and noticed that it didn't charge it either, so no power and no charging battery. Where can i measure voltages? (can't find a post with some pics)

10-15-2014, 23:07	#7 (permalink)
stormanimal83 Junior Member Join Date: Oct 2014 Posts: 2 Member: 2271817 Status: Offline Thanks Meter: 0	Found a solution? Same problem here...