![]() I have removed the PCB there are very few components on this section. On visualize inspection everything looks ok. This type of Humming sound problem are most likely due to either earthing problem or due to some faulty capacitors hence I decide to directly check the amplifier section. Hence we opened the keyboard for inspection. On testing I observed the humming sound coming from both the speakers and it kept gradually increasing. ![]() ![]() My nephew called me to check on his Yamaha Keyboard with the problem of humming sound.
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