Welcome,welcome ! ! !Customer Service:If you need to purchase a large number of chips, we can provide you with wholesale prices! You can contact me by skype and Aliexpress Conversations. I will do my best,to provide you with the best quality service,we will ship the items within 5 working days after the payment is reached.Feedback:1.If you are satisfied with our goods, please give us a positive feedback, thank you for your assistance.2.If you are not satisfied, please kindly let us know. Your constructive advice will be our motion to revise and improve, thank you for your understandingDear buyers:Please pay attention to follwing instruction upon receipt our chips.The BGA chips you buy from our company are of high technology and as pricise as nanometer.For small quantity of chips,they are exposed to the air after being taken out from package.so they probably will adhere to some humidity,thus,in order to avoid quality problem,we suggest that you put them inside a baking chamber for at least 24 hours at 100-110°C(Maximum).When soldering,please make sure that the temperature for lead-free /No Pb BGA chips is 245-260°C(Maximum),Leaded/Pb BGA chips 180-205°C(Maximum).The soldering process is complicated.Soldering/replacing chips must be operated by engineers who have proficient skills.As BGA chips are fragile,complicatedly structured,with mumerous balls,any slightly faulty positioning,careless temperature-comtrol,or incomplete cleaning PCB boards will result in insufficient soldering or missing soldering.the chips will ,as a result ,die.BGA chips are easily get broken by improper soldering ,before buying ,you should comsider 3 points:1) Have you bought the right chips?2) Do you have proper equipment?3) Are you skillful enough to solder the chips?Returns of parts that have been used on machines will not be acceptable.Please comfirm that the chips you received are as described in our store.your satisfaction is of vital importance to the development of our company.if you find any discrepancy ,please be free to contact us without hesitation,for immediate solution.we will either refund or replace the chips.