Xiangchen,

just a fingerpoint:

>
>1)I want to put via under the BGA pad.  But I do not know if 
>there is any problem when to install the BGA chip.

A via in a pad (BGA or not)will "steal" the solder during
a reflow-prozess. You may close the via in a seperate pluging-
prozess but that will reduce the fabs in possibility and 
increase the costs.


Regards,

Waldemar
 
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