What's this black material on PCB ? It's feels like rubber : r/AskElectronics
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How to remove resin silicone potting compound on PCB boards | diyAudio
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integrated circuit - What kind of components are black blobs on a PCB? - Electrical Engineering Stack Exchange
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What is the purpose of this black blob? Is it possible to remove it? : r/AskElectronics
how to remove epoxy resin and smd chips - YouTube
