If this is a PS-2 3V board and it is not the speaker, or bad volume pot in conventional. Do a factory reset. If still not improved it can be a Power Supply board failure, or a Processor failure. You need to be careful, if it is the power supply it can be a fault that causes a hard failure. If not the speaker, you need to let a tech have the boards for testing. I can do it, if no one local. E-mail in profile. G