Hello, For all of you keeping records on this dog RCA Chassis. No sound after lightning/surge .Replaced U1501 and U1601. This restored audio. Main audio ic was found to be good u1900 after injecting audio signal into pin 5 and pin 1 . Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.