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Hi , I`m JackPerhaps I can help you with this problem , a few questions coming up and please note that it may take a few minutes between replies;
A 42" Panasonic tv made in 2007 has 90% chance of being a plasma tv .
Usually the model number would start with the letters TH-P then the screen size as in TH-P42....... in your case.
If you cannot locate the model number on the back , can you confirm it is plasma ?
I saw that you came around to look , Need help with this ?