PanasonicTV, TH-42PX60U turns on as it normally would with picture and audio displaying correctly. After 30-60 minutes of watching TV, the screen goes dark with audio/sound working.
I don't have a voltmeter to check the voltages and that's why I thought I'd ask before if anyone knew what would could be causing it. I pulled the back cover and removed as much dust fom the boards and the vents as well. The backlight seems to be working properly because the TV turns on and a picture displays on the screen. Any suggestions would be helpful.

I took some pictures of the back with...

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Hello!