3gs restart in chargin - Page 4 - GSM-Forum

Wites OM Tesla · 11-04-2011, 13:52

Quote:

Originally Posted by still sdh

Hi!

First of all I want to say great work Wites and Okjar with solving this problem! I hope it's ok to post in this thread instead of starting a new one.

I've had the exact same problem with my 3gs for months and I'm wondering if you guys can help me sort it out? I'm no expert at this matter but I can handle a soldering iron. The iPhone was dropped in water and I have dried it, cleaned it and can't spot any damage except for a short/burn on the silver rectangle with a gold frame on the back of the board. (Check image below)

I should also mention that I have changed the battery with a non-original one, though the phone behaved the same way (restarting) with the original battery too. The phone does not seem to get hot when charging, so I guess the PMIC is ok? I've read all your suggestions in this thread, Wites, but I'm not sure where I should start. I would like to know where the components FL5, U3 and so on is so I can check them out. Is there a picture displaying these parts on the board?

Also, the wifi is dead/greyed out. It just displays 'No Wifi'. Though I can live with that or sort it out later.

I hope you have the time to help me out here, I would really appreciate it!

Best regards,
Sam

That pin you say burned is connected with power button,check with multimeter if not short to gnd,if it short then this is the problem.
Check this region for missing/damaged components.

By wites13 at 2011-10-25

still sdh · 11-04-2011, 15:05

Thank you for the reply, Wites!
I will check this once I get home and report back.

Okjar · 11-04-2011, 17:25

Do you get an error when restoring in itunes? If yes, and it is 29 try irecovery. Not because it will solve the problem but because it reports more detailed about fault. For ex. it help a lot to me repporting about SWI line error. I used multimeter to find where the problem was. It could be something different with yours.

still sdh · 11-04-2011, 17:43

Yeah, I got error 29 when restoring. But I managed to restore it successfully in DFU after many many times with ios5. Didn't think to check iRecovery though, sorry

But can I run iRecovery now? Because it should still read bogus on the battery, right?

Okjar · 11-04-2011, 19:01

I cannot upload files. it just doesn't work.

I uploaded a file her I have marked your burned point.

Maybe it can help you to find where the fault is.

Wites OM Tesla · 11-04-2011, 19:17

Quote:

Originally Posted by Okjar

I cannot upload files. it just doesn't work.

I uploaded a file her I have marked your burned point.

Maybe it can help you to find where the fault is.

In my schematic TP1 is connected with power button sh...t.
This mean TP1 is test point for Light driver supply.

Okjar · 11-04-2011, 19:54

I believe it is there where I marked it. There are TP._AP and TP._RF. APs are at the upper part of circuit (PMIC, CPU and DDRAM). Strange that Apple chose not to add these last to letters in schematics. In the block diagram they are there, of course.

Yes it goes to J4 connector but there is connection to PMIC too.

Still sdh: Are you sure you have cleaned the point. I had an iphone where the menu buttons functions were activated without touching the button.

I found out that one TP on the back was corroded and after cleaning everything was all right.

still sdh · 11-05-2011, 18:12

I have cleaned the burned point and flex cable connections once. But I understand now that I need to do a more thourough cleaning. So I will go to the store and pick up isopropyl to do a complete pcb clean! Also, seems my multimeter is out of batteries so I will pick those up too.

I appreciate your fast answers guys and I'm sorry that I can't keep up with your pace, I've had much to do.

still sdh · 11-07-2011, 13:24

Ok, I now have cleaned the entire PCB with isopropyl alcohol and I've had some success..

At first the 3gs seemed to work as normal when I plugged it in to my wall charger. It showed the correct charging symbol (the lightning bolt) and the battery percent meter increased up til about 60% and then the charging icon changed to the 'charged' icon. See image below.

After this happened it went back to the old behavior of restarting time and time again while charging

I also used the multimeter to test the continuity of some components. Below is the results. Note that I checked them while they were still soldered to the board.

The component I've seen people refer to as the 'black diode' next to the PMIC is also OK. The strange thing is that I think one of the components on the first image did not show continuity the first time I checked it (directly after cleaning) but now it does, could it be it 'jumped' back to life? Dunno, strange though.

What do you guys think the next step should be? It seems it almost is fixed as it managed to work as normal until it reached about 60%

Wites OM Tesla · 11-07-2011, 13:45

In first photo only 3 components must show continuity green fuse and 2 black filters.
In second photo 2 black filters must show continuity.
If capacitors show continuity that is not good,that mean shorting.
Mark in a photo which capacitors short in GND.

still sdh · 11-07-2011, 13:51

The component I got different readings from kept bugging me so I did new continuity tests on it, I must have been too hasty and read it wrong. It is indeed dead!

Is the next step to desolder the component and bridge the solder points or could I re-use a part from an old nokia?

Wites OM Tesla · 11-07-2011, 13:57

Quote:

Originally Posted by still sdh

The component I got different readings from kept bugging me so I did new continuity tests on it, I must have been too hasty and read it wrong. It is indeed dead!

Is the next step to desolder the component and bridge the solder points or could I re-use a part from an old nokia?

Can you explain what you mean dead what it show?

still sdh · 11-07-2011, 14:01

It shows no continuity. I measured it on both ends of the component, or should I use some other point (GND) on the board?

Wites OM Tesla · 11-07-2011, 14:10

Quote:

Originally Posted by still sdh

It shows no continuity. I measured it on both ends of the component, or should I use some other point (GND) on the board?

That is capacitor & is good this mean it not short to GND.
Read carefully my 55 post.

still sdh · 11-07-2011, 14:17

Oh ok, I will do new reading for each component and write down the values and if they do or do not have continuity.

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11-04-2011, 15:05	#47 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	Thank you for the reply, Wites! I will check this once I get home and report back.

11-04-2011, 17:25	#48 (permalink)
Okjar Junior Member Join Date: Mar 2011 Posts: 33 Member: 1539682 Status: Offline Thanks Meter: 0	Do you get an error when restoring in itunes? If yes, and it is 29 try irecovery. Not because it will solve the problem but because it reports more detailed about fault. For ex. it help a lot to me repporting about SWI line error. I used multimeter to find where the problem was. It could be something different with yours.

11-04-2011, 17:43	#49 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	Yeah, I got error 29 when restoring. But I managed to restore it successfully in DFU after many many times with ios5. Didn't think to check iRecovery though, sorry But can I run iRecovery now? Because it should still read bogus on the battery, right?

11-04-2011, 19:01	#50 (permalink)
Okjar Junior Member Join Date: Mar 2011 Posts: 33 Member: 1539682 Status: Offline Thanks Meter: 0	I cannot upload files. it just doesn't work. I uploaded a file her I have marked your burned point. Maybe it can help you to find where the fault is.

11-04-2011, 19:54	#52 (permalink)
Okjar Junior Member Join Date: Mar 2011 Posts: 33 Member: 1539682 Status: Offline Thanks Meter: 0	I believe it is there where I marked it. There are TP._AP and TP._RF. APs are at the upper part of circuit (PMIC, CPU and DDRAM). Strange that Apple chose not to add these last to letters in schematics. In the block diagram they are there, of course. Yes it goes to J4 connector but there is connection to PMIC too. Still sdh: Are you sure you have cleaned the point. I had an iphone where the menu buttons functions were activated without touching the button. I found out that one TP on the back was corroded and after cleaning everything was all right.

11-05-2011, 18:12	#53 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	I have cleaned the burned point and flex cable connections once. But I understand now that I need to do a more thourough cleaning. So I will go to the store and pick up isopropyl to do a complete pcb clean! Also, seems my multimeter is out of batteries so I will pick those up too. I appreciate your fast answers guys and I'm sorry that I can't keep up with your pace, I've had much to do.

11-07-2011, 13:24	#54 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	Ok, I now have cleaned the entire PCB with isopropyl alcohol and I've had some success.. At first the 3gs seemed to work as normal when I plugged it in to my wall charger. It showed the correct charging symbol (the lightning bolt) and the battery percent meter increased up til about 60% and then the charging icon changed to the 'charged' icon. See image below. After this happened it went back to the old behavior of restarting time and time again while charging I also used the multimeter to test the continuity of some components. Below is the results. Note that I checked them while they were still soldered to the board. The component I've seen people refer to as the 'black diode' next to the PMIC is also OK. The strange thing is that I think one of the components on the first image did not show continuity the first time I checked it (directly after cleaning) but now it does, could it be it 'jumped' back to life? Dunno, strange though. What do you guys think the next step should be? It seems it almost is fixed as it managed to work as normal until it reached about 60%

11-07-2011, 13:45	#55 (permalink)
Wites OM Tesla No Life Poster Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 38 Posts: 3,473 Member: 1017374 Status: Offline Thanks Meter: 2,594	In first photo only 3 components must show continuity green fuse and 2 black filters. In second photo 2 black filters must show continuity. If capacitors show continuity that is not good,that mean shorting. Mark in a photo which capacitors short in GND.

11-07-2011, 13:51	#56 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	The component I got different readings from kept bugging me so I did new continuity tests on it, I must have been too hasty and read it wrong. It is indeed dead! Is the next step to desolder the component and bridge the solder points or could I re-use a part from an old nokia?

11-07-2011, 14:01	#58 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	It shows no continuity. I measured it on both ends of the component, or should I use some other point (GND) on the board?

11-07-2011, 14:17	#60 (permalink)
still sdh Junior Member Join Date: Nov 2011 Location: Stockholm, Sweden Posts: 23 Member: 1683380 Status: Offline Thanks Meter: 0	Oh ok, I will do new reading for each component and write down the values and if they do or do not have continuity.