Re: Yamaha CLP411 Electronic Piano
That's a relatively common failure mode associated with semiconductor power devices (any type) if they run warm and are regularly turned on and off, especially if they are fixed to a headsink as well as soldered to the pads of the PCB. As the component warms up, its leads expand a little and as it cools down, they contract a little. Eventually (after many years) this results in a perfectly circular ring-shaped crack in the soft solder surrounding one or more of the leads of the device.
So when you get a chance to look at the regulator, look at least twice at its solder joints on the print / track side of the PCB, or just resolder them regardless.
|