Katji
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hi Savon, I'm not expert enough, but I think there is some sort of ground loop situation with it. Don't take it to a service centre, at least not until you've done as much as you can with someone who is clued up about the electrical side. Service centre is potential risk...their electrical situation is different to yours and your friend's place, best they could do is check if there is any actual fault with it...I dunno. Maybe find best/local service centre and ask them first.
Noted that you tried at friend's place, passive speakers, other speakers, S/PDIF. Also that you get pops/clicks when other stuff switched on/off. Even if it seems specific to your WXA-50, doesn't mean it wouldn't happen with something else.
Friend's place, also using a surge protector?
S/PDIF, no noise....is that optical, Toslink cable?
Noted that you tried at friend's place, passive speakers, other speakers, S/PDIF. Also that you get pops/clicks when other stuff switched on/off. Even if it seems specific to your WXA-50, doesn't mean it wouldn't happen with something else.
Friend's place, also using a surge protector?
S/PDIF, no noise....is that optical, Toslink cable?
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