Frozen screen on plasma TV

It is 15 years old and is old technology. It is really time for a new one, but if you want to try and clean the inside, sure, open it up and look. Keep careful records of the three screen inside, the order and the orientation. It is important. it is more likely failing. This article explains how Plasma works and why they ditched the technology for LED and onwards to 4K Ultra HD.

https://www.techradar.com/news/plasma-tv

https://www.google.com/search?q=Panasonic+Plasma+TH-42PX8A+black+shadows

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It sounds that a software update is necessary. Contact the service centre for Panasonic, to get the latest software to this model Plasma tv.

Filter capacitors (more than 1) in the main power supply

You have experienced a plasma eruption. The fix for this may easily surpass the value of the unit - sorry to hear that.

chake to make sure it is hooked up right and not lose

try looking at the board inside the TV for bulged capacitors see polaroid thread. this is the problem on the polaroid could be the same here.

Help! My Plasma by Magnavox is putting black verticle lines on the right side of the screen - comes and goes - and I replaced the entire Direct TV-HD unit - wires, everything - and had TV company repair - and it still came back. The TV repair refuses to take TV back because it does not show up when they come. Although I videotaped it and showed them which has the date and time - they still refused to take it - and tried to get me to sign a paper saying it was working while they were there - which of course I refused to sign - so they left and nastily said they will not be back-find someone else. I still have the lines - and do not know what to do! Can anyone help?

The best way is to contact your service provider and ask them to trouble shoot guide you, there should be a way to reset or diagnose the receiver or if you prefer go back to the place you bought it and ask for a replacement, You should still have the manufacturer's warranty, check that as well.

Try checking the cable making sure they are tightly plugged in. My dads Plasma screen started showing orange / brown colors in place of primary red... he had been moving things around and didnt realize the wires were loosened in the process. This made him realize.... GET an HDMI and get rid of all the other cables......