Here is my dads str dh790 that was repaired by Sony over 14 months ago for a main board fault that kept making it go in to protect mode. It has now developed the same fault and is around £100 to fix according to Sony if it’s the same problem. Rather than get it fixed it has been replaced so this is up for sale as spares or repairs. When working it is a very good basic atmos amp!
eBay