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Freeview has nothing to do with satellite. FreeSATis the one that uses a satellite dish for reception. FreeVIEW is received through the aerial.
Also, don't fall for the "digital aerial" scam. I install aerials as part of my business. I've been to homes with aerials 20 years old, covered in soot from the chimney and they still pick up Freeview perfectly well. Equally, I've been to homes where the owner has bought some gold plated multi-finned "digital high gain" monstrosity that has awful reception characteristics.
If your TV aerial is okay, then just plug it in to your Freeview receiving TV and do the tuning.
If you do want Freesat then you will need a satellite dish along with a Freesat receiver.
You require a satelite decoder/receiver for your dish and an aerial for your TV. The choice is yours. Plug a satelite receiver, for freesat, into the A/V input on the TV or have an aerial installed for freeview.
The problem you describe is called "Digital Cliff Edge" and it's caused by signal loss. I wont go into the specifics of that at the moment as it's not going to help solve your problem. I you want more information about DCE, try an internet search.
As you are using the same aerial and booster/splitter for both TVs, you are correct in ruling these out as the cause of the problem. The fault is probably in the co-ax cables or connections but you might have a faulty freeview box. Please run through the following checks to establish the source of the fault.
1. Swap your Freeview Boxes - you shouldn't need to re-scan/tune as they are running off the same aerial..
If the Freeview box from the TV that is working correctly freezes and stutters on the other TV, the fault is probably in the cables or cable connections. Next, try the "faulty" Freeview box on the TV that is working correctly. If you get stuttering sound and freezing/pixellation you probably have a faulty Freeview box. DO NOT SWAP ANY CABLES FOR THIS TEST.
If the problem is the same after swapping the freeview boxes:
2. Swap any non-fixed cables, e.g the co-axial "fly-leads" and scart cables - one at a time. See if the fault "moves" with the swapped cables. "Fly leads" are the short co-ax cables that link the Freeview box to the TV or the TV to a wall mounted aerial socket. If the fault "moves" with the swapped cable, you have identified the source of the fault and should either repair or replace this cable.
Try these tests first and post back with the results. If you haven't identified the source of the fault, I will try to assist you further.
Plug your aerial into the freeview box. Connect a scart lead from the freeview box to your TV and switch on. The freeview box, if new, will search for channels itself and as your TV will recognise that it is plugged in, will auto switch to the freeview box. If it is not new, select menu on the freeview box and follow the instructions for tuning. There is nothing to tune on your TV as you are using a scart lead. Hope that helps.
If you want to watch Freeview, then you need an aerial, preferably a proper external (or loft mounted) one. Freeview signals are far weaker than traditional tv signals and so trying to receive them without an aerial or via a tv set-top aerial is usually doomed to failure. If you must use a set-top aerial then connect it directly to the tv (not via a video or any other device) and avoid using "amplified" or "booster" aerials unless you have no other choice.
I'm unfamiliar with Vistron, but usually channels are added by going into the menu and looking for "installation" or "set up". But if you have no aerial then you aren't going to get very far.
If you are using the TV in UK, and you are using the internal digital tuner (aerial cable to TV), then the TV may be defective (faulty tuner or audio circuit). In that case call Grundig at the number listed on manual. If TV is using an external digi box (eg. freeview), then check connection from box to TV, test using a different connection cable. Test using a DVD, if TV works on DVD replace the digi box.
If you are trying to use the TV outside UK, and you are using the internal digital tuner, then there may be a problem with signal. In that case purchase a tuner box and connect it to the TV.
I wrote this down to connect at Digital Freeview box to TV and to Video. It works for me on a portable TV and I am a grannie so if I can do it ............ I did buy one of those scart boxes which allows 4 scart leads just like an electric plug multi socket, very cheap price. Hope this helps and Happy New Year.
Take the scart connector box lead to the digi box.
The scart from the TV and the scart from the Video both go to scart box.
TV aerial itself not plugged in or used.
Bottom video aerial to right digi hole
Another aerial lead (not aerial) from TV hole to left digi hole