Samsung TV has sound but no picture, but CAN watch dvds?

I don't know the specific make of TV cause its my brother's and he doesn't live nearby, but he's been having issues where he has no picture from the TV reception but there is sound. But he can watch dvds or things he's recorded onto the harddrive no problem.

I was thinking it could be the HDMI but where he gets his TV reception from is the same machine the digital comes from, so I'm wondering if it could be the reception itself? However, other tvs in the house work fine....

Any ideas?
 
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