iPhone 3gs, what chip is damaged? - Page 3 - GSM-Forum

alexlaboratory · 10-22-2010, 05:57

yes you gonna need hot-air station

tobygoodbar · 10-28-2010, 00:09

the new genuine 3gs battery came in today. replacing it, did not solve the problem.

oddly, when the screen is turned on, the phone will randomly reboot itself. this is new since replacing the battery. i dont know if this indicates anything, if something is loose, or just coincidence.

what do i do next?

alexlaboratory · 10-28-2010, 01:23

Quote:

Originally Posted by tobygoodbar

the new genuine 3gs battery came in today. replacing it, did not solve the problem.

oddly, when the screen is turned on, the phone will randomly reboot itself. this is new since replacing the battery. i dont know if this indicates anything, if something is loose, or just coincidence.

what do i do next?

Did you try Resore the phone yet? try put in in dfu mode see if the computer detects it...............

tobygoodbar · 10-28-2010, 01:55

no i havent, because the phone isn't recognized on the cable. i will try DFU mode and see if it is detected.

i believe its hold power and home until apple appears and then release power?
removing the logic board will take it OUT of DFU mode if that fails correct?

alexlaboratory · 10-28-2010, 02:09

Quote:

Originally Posted by tobygoodbar

no i havent, because the phone isn't recognized on the cable. i will try DFU mode and see if it is detected.

i believe its hold power and home until apple appears and then release power?
removing the logic board will take it OUT of DFU mode if that fails correct?

with usb in hold pow+home button for 10 secs then realsease pow and keep holding home button

tobygoodbar · 10-28-2010, 02:23

no luck. still won't recognize phone.

tobygoodbar · 10-28-2010, 03:09

i swapped the old battery back in, and it stopped rebooting at random. wierd.

anyway, so what should be the next step?

alexlaboratory · 10-28-2010, 04:49

next step remove and link those filters in the picture i posted before

ravin j tejura · 10-28-2010, 10:08

sir i have 3 i phone 3gs 16 gb,,...
my phone is shorted after over charging...my phone is dead
plz help me

tobygoodbar · 10-29-2010, 05:01

Quote:

Originally Posted by alexlaboratory

next step remove and link those filters in the picture i posted before

have you done this before?
do you break them off, or use a soldering gun (solder iron)?

most circuit boards i worked with, you can melt from the bottom, but you cannot do this with an iphone board. so i am asking questions or tips before i start to prevent damage

alexlaboratory · 10-29-2010, 05:07

Quote:

Originally Posted by tobygoodbar

have you done this before?
do you break them off, or use a soldering gun (solder iron)?

most circuit boards i worked with, you can melt from the bottom, but you cannot do this with an iphone board. so i am asking questions or tips before i start to prevent damage

you should use hot air station to desolder them with out damage to the component or pcd

yes you could break them off but bit riscky and doggy way to do it, lol

tobygoodbar · 10-29-2010, 05:12

i was afraid that would be the answer. i have no hot air station, only gun.

maybe this is where i stop....

if i can find someone with a hot air station, is it possible to purchase the usb control IC and the power ic?

alexz702 · 11-22-2010, 23:19

I have a 3gs turns on fine when plug in to the charger . I restore it with the computer the iphone had suffer water damage. And it give me error 23 and now stuck in itunes mode. could the problem be the filters?

chapster · 02-20-2011, 19:11

The parts that have been removed in the above image are not 'filters' (presumably people mean inductors?). They are MOSFETs (P-channel transistors) Si8409DB, designated Q4 and Q5 on the circuit. The datasheet for the MOSFETs is: http://www.vishay.com/docs/73111/73111.pdf and will show that the devices have 4 bumps using lead-free solder. The bodge above would most likely be linking the source and gate pads judging by the datasheet. This would provide VBUS and VBUS_PROTECT with full USB voltage.

Whoever came up with this certainly knows their stuff. Who did come up with the workaround?

My 3GS had the battery fail. I bought another and fitted it, but although it runs the phone, it won't charge. Sometimes it'll show the battery charged icon (plug), other times the lightning symbol (or the lightning symbol if you unplug and replug enough times). Either way, when it shows it's charging, it isn't actually charging, and the battery is depleting very quickly compared to normal.

beepcellular · 06-16-2011, 05:02

i need to change ic chip for iphone that have no baseband. The bord are damege by puting ipad baseband 3gs. Flexqueen sell these to chage ic chip has anyone buy these?
LK863 Professional Infrared Repair Station with Soldering and Hot Air Gun
Who changes these chip and how?? i will send 2 bords to get them fix anyone???
[email protected]

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10-22-2010, 05:57	#31 (permalink)
alexlaboratory No Life Poster Join Date: May 2008 Location: Hell and beyond Posts: 914 Member: 771230 Status: Offline Thanks Meter: 773	yes you gonna need hot-air station

10-28-2010, 00:09	#32 (permalink)
tobygoodbar Junior Member Join Date: Oct 2010 Posts: 22 Member: 1421688 Status: Offline Thanks Meter: 6	the new genuine 3gs battery came in today. replacing it, did not solve the problem. oddly, when the screen is turned on, the phone will randomly reboot itself. this is new since replacing the battery. i dont know if this indicates anything, if something is loose, or just coincidence. what do i do next?

10-28-2010, 01:55	#34 (permalink)
tobygoodbar Junior Member Join Date: Oct 2010 Posts: 22 Member: 1421688 Status: Offline Thanks Meter: 6	no i havent, because the phone isn't recognized on the cable. i will try DFU mode and see if it is detected. i believe its hold power and home until apple appears and then release power? removing the logic board will take it OUT of DFU mode if that fails correct?

10-28-2010, 02:23	#36 (permalink)
tobygoodbar Junior Member Join Date: Oct 2010 Posts: 22 Member: 1421688 Status: Offline Thanks Meter: 6	no luck. still won't recognize phone.

10-28-2010, 03:09	#37 (permalink)
tobygoodbar Junior Member Join Date: Oct 2010 Posts: 22 Member: 1421688 Status: Offline Thanks Meter: 6	i swapped the old battery back in, and it stopped rebooting at random. wierd. anyway, so what should be the next step?

10-28-2010, 04:49	#38 (permalink)
alexlaboratory No Life Poster Join Date: May 2008 Location: Hell and beyond Posts: 914 Member: 771230 Status: Offline Thanks Meter: 773	next step remove and link those filters in the picture i posted before

10-28-2010, 10:08	#39 (permalink)
ravin j tejura No Life Poster Join Date: Sep 2005 Location: now im in dubai Age: 40 Posts: 539 Member: 184822 Status: Offline Thanks Meter: 33	sir i have 3 i phone 3gs 16 gb,,... my phone is shorted after over charging...my phone is dead plz help me

10-29-2010, 05:12	#42 (permalink)
tobygoodbar Junior Member Join Date: Oct 2010 Posts: 22 Member: 1421688 Status: Offline Thanks Meter: 6	i was afraid that would be the answer. i have no hot air station, only gun. maybe this is where i stop.... if i can find someone with a hot air station, is it possible to purchase the usb control IC and the power ic?

11-22-2010, 23:19	#43 (permalink)
alexz702 Banned Join Date: Nov 2010 Posts: 156 Member: 1439005 Status: Offline Sonork: alexz702 Thanks Meter: 11	I have a 3gs turns on fine when plug in to the charger . I restore it with the computer the iphone had suffer water damage. And it give me error 23 and now stuck in itunes mode. could the problem be the filters?

02-20-2011, 19:11	#44 (permalink)
chapster Insane Poster Join Date: Jul 2009 Posts: 86 Member: 1086977 Status: Offline Thanks Meter: 50	The parts that have been removed in the above image are not 'filters' (presumably people mean inductors?). They are MOSFETs (P-channel transistors) Si8409DB, designated Q4 and Q5 on the circuit. The datasheet for the MOSFETs is: http://www.vishay.com/docs/73111/73111.pdf and will show that the devices have 4 bumps using lead-free solder. The bodge above would most likely be linking the source and gate pads judging by the datasheet. This would provide VBUS and VBUS_PROTECT with full USB voltage. Whoever came up with this certainly knows their stuff. Who did come up with the workaround? My 3GS had the battery fail. I bought another and fitted it, but although it runs the phone, it won't charge. Sometimes it'll show the battery charged icon (plug), other times the lightning symbol (or the lightning symbol if you unplug and replug enough times). Either way, when it shows it's charging, it isn't actually charging, and the battery is depleting very quickly compared to normal.

06-16-2011, 05:02	#45 (permalink)
beepcellular Banned Join Date: Apr 2009 Posts: 223 Member: 1020230 Status: Offline Sonork: beepcellular Thanks Meter: 15	i need to change ic chip for iphone that have no baseband. The bord are damege by puting ipad baseband 3gs. Flexqueen sell these to chage ic chip has anyone buy these? LK863 Professional Infrared Repair Station with Soldering and Hot Air Gun Who changes these chip and how?? i will send 2 bords to get them fix anyone??? [email protected]