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| iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides. |
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07-21-2014, 17:38
| #1 (permalink) |
| Freak Poster  Join Date: Aug 2013 Location: Germany
Posts: 121
Member: 1996518 Status: Offline Thanks Meter: 15 |  Soldering U2 back iPhone5 got an iPhone5 which drained Battery very fast. U2 was heating, so i removed it by putting the solder tip direct onto the chip. Now i ordered a new U2 chip and want to put it back with hot air. Anyone can give me an advice which temperature is save to work with? 250°C / low airflow, and hide CPU with small piece of metal cover? Regards |
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07-23-2014, 07:03
| #4 (permalink) |
| Freak Poster Join Date: Jan 2013 Location: Switzerland Age: 48
Posts: 408
Member: 1873863 Status: Offline Thanks Meter: 67 | Exkurs cover the cpu with a coin, like a 2 Euro's coin, it's good to shield the cpu from heat. |
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| The Following User Says Thank You to laptopmd For This Useful Post: |
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07-24-2014, 22:17
| #8 (permalink) |
| Cheater -Don't Deal with him-  Join Date: Dec 2013 Location: XK Age: 26
Posts: 1,479
Member: 2089356 Status: Offline Sonork: Threema: 3N5W6VV9 Thanks Meter: 520  | yea i have those problem i had problem re-placing this , thnx all for infos, mine after remove the ic and placed again phone was dead,,, please post again if phone is succsesfuly repaired i wanna know |
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07-24-2014, 22:25
| #9 (permalink) |
| Freak Poster Join Date: Aug 2013 Location: Germany
Posts: 121
Member: 1996518 Status: Offline Thanks Meter: 15 | Never did this repair before, so the risk to damage the device is high I think. I will try,since I can't use it with damaged U2 I have nothing to lose.. When you have placed it back, aligned it properly and use little of airflow it should work |
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07-24-2014, 22:55
| #10 (permalink) | |
| Cheater -Don't Deal with him- Join Date: Dec 2013 Location: XK Age: 26
Posts: 1,479
Member: 2089356 Status: Offline Sonork: Threema: 3N5W6VV9 Thanks Meter: 520 | Quote:
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08-11-2014, 11:14
| #11 (permalink) |
| Freak Poster Join Date: Aug 2013 Location: Germany
Posts: 121
Member: 1996518 Status: Offline Thanks Meter: 15 | I replaced the chip yesterday. Reballed it with leaded solder, covered the CPU with two euros. I used 290c (display value) with 6mm nozzle, 3.0 airflow. Took some time to get to the desired temperature. I permanently watched through my microscope until solder melted. Phone works like designed now. The hardest part was reballing the chip without additional tools, but with 0.1mm tip. |
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08-11-2014, 11:51
| #12 (permalink) | |
| No Life Poster Join Date: Jun 2007 Location: I N D I A (G U J A R A T)
Posts: 1,777
Member: 530705 Status: Offline Sonork: 1616834 Thanks Meter: 833 | Quote:
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08-11-2014, 12:09
| #13 (permalink) |
| Freak Poster Join Date: Jan 2013 Location: Switzerland Age: 48
Posts: 408
Member: 1873863 Status: Offline Thanks Meter: 67 | Great job Exkurs !!! this weekend i had to do this too, but i have removed the chip with the iron, and reballed by placing balls by hand (kostelektronik style). |
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08-11-2014, 13:16
| #15 (permalink) |
| Freak Poster Join Date: Jun 2014
Posts: 400
Member: 2205919 Status: Offline Thanks Meter: 33 | to remove U2 i use 180degree, and slowly remove glue from U2 chip and around it... then i heat it with 380degree, remove, then 180degree remove rest of the glue under it and that's it  |
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