Why would the red power LED on a Cony mini hi-fi system model No hcd-cpx22 flash and the system become inoperable?

you have to replace transistor Q906 (2SC1623) in to a 2SC639, this transistor you wil find on the main board and you will see it hes been heated, it is mistake made bij sony, this transistor can't dissipate the current witch it has to it wil not measure defect but it is. change it and your stereo wil work again! Reyn