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I'm disassembling a non-functioning toy keytar. This is the chip behind a couple buttons, including an on/off button. What could the black, glassy bulge component be?

enter image description here

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It is an on board IC chip bonded directly to the board with an epoxy blob protecting it. Common in low cost assembly.

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  • \$\begingroup\$ Thanks a lot Roy! \$\endgroup\$
    – Anna
    Commented Dec 12, 2020 at 15:56
  • \$\begingroup\$ Yep... In the biz we call this 'die bonding' \$\endgroup\$
    – Kyle B
    Commented Dec 12, 2020 at 17:55

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