hi, I am currently trying to tune in the digital terresterial tv channels. My signal quality is excellent and my signal strength is at about 75%. My tv model is : 32PFL796....

When I manually tuned in the channel I was able to see all the channels with the programme details; I was unable to see any picture and the message 'video signal not supported' appeared on the screed.
I then went back and went through the automatic tuning, this time only the radio stations appeared.
can someone advise me?
thanks