Is it in picture in picture mode?
SOURCE: Tv wont turn on worked fine last night
If there is no power at all, then the problem is likely the power supply unit.
The PSU must be tested, then eventually replaced.
SOURCE: Panasonic viera has flashing channel info in upper left corner
I had this exact same issue just yesterday. Channel info would flash
intermittently. While set was in this mode, could not enter menu,
change channels, etc. from remote or front panel controls. Similar to tjh492, I thought it might be an
overheating issue. But unplugging the Viera and waiting for set to cool
made no difference.
I then remembered that this issue popped up the instance I surfed to a
particular channel (FWIW, 26-3 "Me Too" on Comcast here in Aurora,
Illinois, USA). I had a hunch that there might be an issue with the
signal on the channel that prevented the Viera from properly syncing,
so I decided to unplug the antenna cable. Once I did that, the channel info
displayed steady. I was then able to change channels (of course screen
was blank as antenna cable was unplugged) and enter the Viera menu. I
immediately went to channel set-up and manually removed channel 26-3
from the channel list. After reconnecting cable, Viera was back to
normal. Since I'm not a big fan of "Me Too", problem solved :)
Not sure why a digital channel sync issue would effectively make the
Viera remote and front panel controls inoperable. Pure speculation, but it could
be that the Viera microprocessor was overloaded trying to sync to channel and this prevented any interrupts from remote or front panel
controls.
SOURCE: LG TV - TV Guide Function Stuck
I have the same issue on an LG TV. The TV Guide is completely black with a small picture in the corner. It's as if the software is no longer working.
SOURCE: Samsung PS50C91HDX Sound but no picture
It sounds like the main board or screen may have gone
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