The High Power Transformer (Magnetron) fuse is wrong. Replace it. It will work perfect... The fuse is always hidden in a plastic case fixed at the bottom of the microwave near the big capacitor... My email: [email protected]
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I not know if this matches you unit, but it may help give some guidance on getting your keypad working again. Next time, please provide manufacturer and model number, which will help solve your problems faster. https://www.youtube.com/watch?v=_yWSU0kTkTg
sounds like the hi voltage diode or capacitor are intermittant, the thump is the transformer drawing current when the magnetron tube calls for hi voltage to operate, you will see the lights dim slightly every time it cycles the mag tube for heat