I think the answer might be " Throw it out. Buy a new one. ", but I'll ask anyway.
I have a Sony " Mini HiFi Component System " ( what a laugh - model FH-B411 just in case ) which has a push-button preset radio as part of its features. Last weekend without me touching anything it went to white noise on all bands and whatever I did couldn't get it to tune anything. Its CD player and tape deck still work, so the main power supply and amps are working I guess.
My knowledge of electronics is a shining symbol of ignorance, and radio communications is pure black magic to me, but I know enough to be a menace to public safety. So I took the cover off and couldn't see anything obvious like insects or any appreciable dust build-up ( I vacuumed the boards anyway ). The areil connections were good. The auto-tune routine goes on as normal but it goes straight past well known frequencies and doesn't get a hint of anything. White noise all the way. My guess is that it has a frequency generator inside which it uses as some sort of phase-lock thingy to tune into stations. If this is buggered then everything else is useless.
So, as this radio is 9 years old and has been on for about 15 hours a day since new, is it likely that the silicon has simply given up ? Does anyone out there know if this is a common fault that is fixable ?
I'm not a cheapskate, and I would happily buy a new one except this one has ' propper ' wooden speaker boxes and sounds a lot better than any new ones I listened to.
Thanks for any help, abuse or sloppy kisses, Dean.