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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 01-26-2013, 22:51   #1 (permalink)
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Iphone 4 wont make test call after removing caps to fix water damage


http://www.skyecomputer.com/baseband.jpg
http://www.skyecomputer.com/baseband1.jpg
http://www.skyecomputer.com/baseband3.jpg

These are some pics removed shorted caps near baseband some other ones had damage as you can see in picture 2 it has full service connects to verizon i go to make a 611 call it hangs in calling did i network setting reset didnt work havnt tryed factory yet before i removed these caps the phone would not charge by battery i dont know if the pics are to close up thanks in advance for all help
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Old 01-27-2013, 17:13   #2 (permalink)
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Anyone have any advise this one is driving me crazy
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Old 01-30-2013, 20:53   #3 (permalink)
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Check the two points where the cap used to be. does it still beep? if so your short is somewhere else.
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Old 01-31-2013, 17:47   #4 (permalink)
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When an engineer design a circuit with capacitors, they are there for a reason ;-) They minimize ripple when you have a change in voltage. If you have made a huge reduction in capacitance between a voltage line and ground, this could cause problems!
Therefore: resolder all (or at least the big ones) capacitors, and if nothing else is damaged on the board, you should be good to go!
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Old 02-01-2013, 02:27   #5 (permalink)
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yah jergeron the capacitors in the pic http://www.skyecomputer.com/baseband1.jpg are very small i dont think i have the parts to resolder but this is were i think my problem is coming from that other wise some of the bigger caps that i did desolder that were shorted do to water damage did fix the major problem with the phone if you think its the bigger ones in the other 2 pic i think i can resolder i just didnt know if the smaller ones in the link that i just referenced were actally filters and maybe needed a solder bridge again im not a professional i just do what i can i understand everything is there for a purpose i just didnt know if anyone could direct me as to what part of the board was causing this problem i will work on it again tommrow and post results thanks for your input.
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Old 02-04-2013, 20:02   #6 (permalink)
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You can find schematic on this forum, and from this you can see if the components you have removed are capacitors or coils.
You should defiantly resolder the bigger capacitors (>1uF), this could very well be the root to problems :-)
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Old 02-05-2013, 16:52   #7 (permalink)
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only problem i found a few schematic the 4 s and the 4 but this is a cdma iphone 4 and only schematic i found was the gsm and they are different either way this board had a ton of water damage and its possible i may just let this one go its only a 8 gig verizon phone anyway just got to many hours into looking at this great thanks to all who helped and i wish i could have posted a solution to this one. i have resolder all big caps and they get no bleep so there not shorted i did pull a pad on one of them so i cant resolder that one anyways thx again.
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