For example, the 7300 card chip, the oxidation of the fierce, and ordinary welding did not work, with 8205 plus welding can not blow the chip, and finally blown out, the normal situation of welding, it is easy to blow
This situation you need to use strong activity to help paste, if possible, the best cleaning after completion of welding.
You can try the same side maintenance special flux
Dry blow will certainly blow bad, and add some welding treasure. Can protect PCB to help melt
