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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 05-22-2012, 11:34   #1 (permalink)
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Iphone 4 hardware problem rebooting during restore

Hi iphone 4 rebooting during restore wont turn on tooked out all mainboard placed in new iphone 4 still same.. tried all restore methods just rebooting i think this is power ic or flash memory pls help
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Old 05-22-2012, 18:50   #2 (permalink)
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its nand flash ic problem,better to reball it
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Old 05-23-2012, 09:16   #3 (permalink)
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never reballed nand flash its harder then other ic to reball ?
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Old 05-23-2012, 09:33   #4 (permalink)
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nope it has only a few and very big balls, but apple used a lot of glue on it, it's hard to lift
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Old 05-23-2012, 10:29   #5 (permalink)
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Can u please tell my how much celcius i need to set on my hot air machine for nand flash reball ? and what is easy way to lift ic and get rid of these glues ? ty man
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Old 05-24-2012, 19:38   #6 (permalink)
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you use 280 degree & u need glue remover paste or very carefully clean first glue and remove,u will be success
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Old 05-24-2012, 20:44   #7 (permalink)
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usually i use 200C measured on the BGA, then put some gel flux around the IC, wait some sec, then use a nail and scrap all the glue around the IC. Then the heat will better goes under the IC, you will need a lower temp to lift the bga then.
If you can see the nearby component solder melting, try to gently move the BGA, if not wait some sec and retry! try also to lift it with a tweezer or something else, but pry it gently
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Old 05-25-2012, 07:13   #8 (permalink)
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Ty for info guys i will try today
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