Iphone 3GS no Power, no Sync, total dead - GSM-Forum

scarfays · 10-26-2012, 21:10

Hello
I have an Iphone 3GS
It is totally dead
How to know where is the problem?
I change the dock, the battery, but still nothing?
Thank you for your help

adytuuxx · 10-26-2012, 21:12

bring it to a mobile phone service.

scarfays · 10-26-2012, 21:19

no thank you
I want to do it myself
After research is said to change the Power Manager IC??
How do I know if the problem is it?

benji86 · 10-26-2012, 21:51

Quote:

Originally Posted by scarfays

no thank you
I want to do it myself
After research is said to change the Power Manager IC??
How do I know if the problem is it?

You will have a tough time changing the PMIC without the right knowledge, I'd sell the board or give it to someone who knows.

wadis · 10-26-2012, 22:10

Since you have found out that it is the power IC from your search, you can look somewhere in this forum for the schematic diagram to know its location but you will need an expert to do the changing for you with a rework station and from where you will get the replacement.

Wideon2000 · 10-26-2012, 22:39

check the green fuse it maybe the a start

is there any voltage anywhere if not check that green fuse

scarfays · 10-29-2012, 12:25

OK but find the fuse or Green?
Green fuse down the vibrator?

kostelectronics · 10-29-2012, 12:49

Do you have the Schematics?

It's quite easy to diagnose the PMIC.
(You need a Battery with over 3.8V charge)

1. Check for Batt-VCC at C216_AP
2. After connect the Battery, check for 0V at L10_AP and L11_AP
3. Press for 0.5sec the Power-Button and masure at L10_AP and L11_AP. The Voltages must be 1.2V and 1.8V for about 0.75seconds then back to 0V.
4. Press Power-Button longer and check if the Voltages at L10_AP and L11_AP stay.

If all this is ok, the Phone must turn on or go into DFU-Mode.
If this is not ok, tell the results and i will help you furhter.

BR

scarfays · 10-29-2012, 12:59

kostelectronics · 10-29-2012, 13:27

Quote:

Originally Posted by scarfays

How should this phone can turn on?

....Your Battery is fully drained! What voltage you get there after you connect the charger?

khawarashraf · 10-13-2013, 21:29

Quote:

Originally Posted by kostelectronics

Do you have the Schematics?

It's quite easy to diagnose the PMIC.
(You need a Battery with over 3.8V charge)

1. Check for Batt-VCC at C216_AP
2. After connect the Battery, check for 0V at L10_AP and L11_AP
3. Press for 0.5sec the Power-Button and masure at L10_AP and L11_AP. The Voltages must be 1.2V and 1.8V for about 0.75seconds then back to 0V.
4. Press Power-Button longer and check if the Voltages at L10_AP and L11_AP stay.

If all this is ok, the Phone must turn on or go into DFU-Mode.
If this is not ok, tell the results and i will help you furhter.

BR

Hello, i have the same problem. I did all the steps listed above. When i press the power button for short time or long time, the voltages go to 1.2v and 1.8v and just stay there. Phone keeps on drawing 0.6 current from the power supply.

When i connect to computer, it is detected by the computer but iTunes doesn't detect it, so i'm not sure if its in DFU mode or not.

The problem phone came in was with water damage and corrosion around C94_AP, C121_AP and C64_AP.

Power IC was getting hot when connected. I cleaned up the corrosion and power ic was not getting hot anymore but C94_AP was shorted and getting hot. So i removed C94, C121 and C64. Then i replace C94 from another board. C121 and C64 are still removed.

So, is C121 and C64 needed to get out of this situation? what else i can do from here?

10-26-2012, 21:10	#1 (permalink)
scarfays Junior Member Join Date: Sep 2012 Posts: 4 Member: 1818308 Status: Offline Thanks Meter: 0	Iphone 3GS no Power, no Sync, total dead Hello I have an Iphone 3GS It is totally dead How to know where is the problem? I change the dock, the battery, but still nothing? Thank you for your help

10-26-2012, 21:12	#2 (permalink)
adytuuxx Freak Poster Join Date: Jan 2010 Location: cyprus Posts: 421 Member: 1223870 Status: Offline Sonork: .............. Thanks Meter: 74	bring it to a mobile phone service.

10-26-2012, 21:19	#3 (permalink)
scarfays Junior Member Join Date: Sep 2012 Posts: 4 Member: 1818308 Status: Offline Thanks Meter: 0	no thank you I want to do it myself After research is said to change the Power Manager IC?? How do I know if the problem is it?

10-26-2012, 22:10	#5 (permalink)
wadis Major Poster Join Date: Aug 2004 Age: 57 Posts: 41 Member: 78523 Status: Offline Thanks Meter: 1	Since you have found out that it is the power IC from your search, you can look somewhere in this forum for the schematic diagram to know its location but you will need an expert to do the changing for you with a rework station and from where you will get the replacement.

10-26-2012, 22:39	#6 (permalink)
Wideon2000 Freak Poster Join Date: May 2005 Posts: 244 Member: 144806 Status: Offline Thanks Meter: 22	check the green fuse it maybe the a start is there any voltage anywhere if not check that green fuse

10-29-2012, 12:25	#7 (permalink)
scarfays Junior Member Join Date: Sep 2012 Posts: 4 Member: 1818308 Status: Offline Thanks Meter: 0	OK but find the fuse or Green? Green fuse down the vibrator?

10-29-2012, 12:49	#8 (permalink)
kostelectronics No Life Poster Join Date: Apr 2009 Location: Wikon, Switzerland Posts: 941 Member: 1012778 Status: Offline Thanks Meter: 245	Do you have the Schematics? It's quite easy to diagnose the PMIC. (You need a Battery with over 3.8V charge) 1. Check for Batt-VCC at C216_AP 2. After connect the Battery, check for 0V at L10_AP and L11_AP 3. Press for 0.5sec the Power-Button and masure at L10_AP and L11_AP. The Voltages must be 1.2V and 1.8V for about 0.75seconds then back to 0V. 4. Press Power-Button longer and check if the Voltages at L10_AP and L11_AP stay. If all this is ok, the Phone must turn on or go into DFU-Mode. If this is not ok, tell the results and i will help you furhter. BR

10-29-2012, 12:59	#9 (permalink)
scarfays Junior Member Join Date: Sep 2012 Posts: 4 Member: 1818308 Status: Offline Thanks Meter: 0