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Hello, and sorry you're having problems. We are now connected on this website- which saves you money over having a Tech come to your home, and in many cases we can fix the problem you're having. In other cases, these things do require additional parts to fix. But I can help you with that as well.
Can you get me the model number off of the back of the set?
Also does the sound continue even after the screen goes black?
Is the power light blinking at any point during this?
I'm not sure what you're referring to, but given the context here, I will opt out and open the question to other experts to help you. Good luck.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the Panasonic TV.
Still, the described symptom almost always point to an internal hardware issue.
Please post back how you would want to approach this and/or should additional information be needed.