Dave investigates the piezoelectric effect in multi layer chip capacitors (MLCC's). In this case, on the backlight inverter on his own BM235 multimeter.
Forum: http://www.eevblog.com/forum/blog/eevblog-855-ceramic-capacitor-piezoelectric-effect/
http://www.hycontek.com/attachments/LCD/DS-HY2613_EN.pdf
Capacitor Tutorial video: https://www.youtube.com/watch?v=TDDoi70cxw0
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