Recently, many have inquired about how to deal with Non-Wet-Open (NWO) issues when encountering BGA packaged ICs soldering. The defects associated with NWO are quite similar to those of HIP (Head-in-Pillow) and typically occur at the edges and corners of BGA packaged ICs. The root cause often lies in the substrate or PCB of the BGA, where the board material may deform due to the high temperatures during the reflow process.
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