I have a 47in to Toshiba Regza model # 47zv650u and I was watching tv when the screan went black but I still had sound. So I tried flipping threw some more channels and still nothing. Then I tried to

SOURCE: Toshiba 50HP66 Blank Screen with sound

I would suggest to read what other members have reported by clicking here.
Good Luck.

SOURCE: No Video for my cable tv. Audio works

You have the TV connected to the cable box with an HDMI cable, I'll bet. The problem is with the cable box. If you unplug the cable box and plug it back it it will reboot and proabably work. You should connect the cable box to the TV using component cables and you won't have this problem again.

SOURCE: goes on and off on and off permantly

your backlight is going out.. get it replaced

SOURCE: Was watching tv( Toshiba Regza)and the screen went blank.

I have the same television and ocasionally the sound shuts-off, but I still have a picture.
What type of cable system do you have? What kind of converter box? I am trying to find out if it is the TV or converter box. I change the channel a couple of times and the sound usually comes back.

SOURCE: Toshiba 52" REGZA has a grainy picture

There is no easy (read: cheap) solution for this. Especially because your TV is so big, the only thing that will look good on it is something that plays at the very least 720p HD output.

I don't know what your DVD player model is, but you want an upconverting DVD player, and even then, the quality will not be full HD. The only thing that is full 1080p HD on the market today is Blu-Ray, and game consoles like XBox 360 and PS3.

As for the sports, it depends on the TV you bought. If the deal was too good to be true for a 52" TV, you probably got one with a low Hz, or a high refresh rate. This means that the images played don't update quick enough for high motion video like action movies and sports, which is why it's blurry. Mine has a 3ms response time, by comparison.

Hope this helps, please rate me.