hifi engine

Need some guidance with a Sony STR4800SD receiver

Cosmetically she's lovely but has an issue...drops left channel in stereo mode usually when warmed up.Works fine in mono.All contacts have been cleaned,have pretty much run the gamut as far as various hookups.A B A&B etc.Same problem if I use headphones.Any suggestions are appreciated.



Need some guidance with a Sony STR4800SD receiver

I believe that receiver uses modules for power amplifiers; one of them may be bad, or there may be bad solder connections on the pins.