TV has no picture, but does have a backlight

I have a 50" Samsung Plasma TV Model PN50A450P1D. A while ago the tv made a popping noise, let out a little smoke, and turned off. I found one capacitor on the power board that had popped (10V 4700 uF), so I replaced it. Now the tv turns on, but will not display anything. I can see the backlight turn on when I press the power button; but, the Samsung logo doesn't display, and it doesn't play the startup noise. I am not sure where to go from here. I may take off the boards one by one to check the back sides for damage, but I can't see any other blown capacitors from the back and all the fuses seem fine. Any advice on what to check would be helpful. Thank you in advance.

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