Power supply squeals even with hot removed,resoldered and replaced numerous caps,fly and yoke ring ok,no obvious shorts please any tips on this Mark Simpson Mark Electronics Plant City,FL (813)717-9700 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.