Question about Zenith IQB36B42W TV

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Zenith Inteq-picture too dark

To start off my tv is a standard 36" zenith inteq model number IQB36B42W. My tv was purchased 8 years ago and has worked fine until this year. My tv was moved to another room and worked great at first. Then one day I turned it on and the picture was too dark to hardly see anything. I eventually switched to the atenna view which showed some static (which was brighter) just so I could see the menu. The menu was completely black until I went through every option to finally see a slightly brighter picture. I turned the brightness and contrast up, but everything is still too dark. The setting I used for the tv is a custom setting and the other settings show too dark. One exception is a digital preset mode which gave me the slightly brighter picture. Another odd thing is that the picture-in-picture shows perfect. I also switched the input from the a/v connection to component video and that shows even darker. Can you please help me with this problem.

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