I am currently building a drone and am in the process of soldering the escs on. The first 3 and a half escs soldered on with ease then when I tinned this pad, the solder was only sticking to the center of the pad. I then soldered the wire on thinking that it might be strong enough. When I soldered the wire on everything was melted fine, but when I released the wire it just popped off along with the solder that was on the board. I repeated this process 2-3 times. When I touch this area it is slightly sticky to the touch. It was more sticky but I put isopropyl alcohol on it. Before I put the alcohol on it there was a visible layer of what looked like flux. Is this just flux residue or a damaged board?
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