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Originally Posted by Halim_xu  Hi all,,  as we see there are many thread discussing about bga chip and solutions, in this opportunity i'm trying to post a new topic " BGA PAD PEPAIR " anybody with your experiences, ideas or solutions would please to share with us...Have a nice day example pic :  |
Hello,
BGA PAD repair requires good soldering skills and most important is steady hand, very good eye sight or you have to use very good quality lens (magnifier), buy a good quality solder gun with temp controller (should support lead free) with fine soldering tip, some lead free solder wire, copper de-soldering wick and a blade.
BGA PAD repair requires time and attention, some pads are dummy on the pad so need not worry if it has come out, some bga pads will be test points so no need to worry about it, but check for the pads which are important excluding the other two i have mentioned earlier, once the pads are noted for reconstruction, take the blade remove the conformal coating till the pth point or till it has broken and first solder copper de-solder wick strand to the end where the bga pad line is broken, then route copper wick strand to the bga pad where it will come into contact with bga ic solder ball , cut the strand using a blade. use lead free solder for bga contruction because if you use lead based solder the melting point is 183 deg and if the bga ic you are replacing is lead free (215-220 deg) chances are the copper strand you have used for reconstruction of the pad will move.
if possible will post photos of reconstructed pads.
bye