Edit: how did you test with modulator to start with? I am suspecting you just changed channels and didnt actually 'tune a channel' whilst amiga was connected and powered up? Sorry if its a stupid question but ive got to ask. Worst case is perhaps your TV doesnt like the modulator signal or it wasnt all connected up properly when you tuned a channel in.
Yes, that was my initial problem with the TV. I had no way of scanning for a signal to tune it in, I thought the remote would have more options than the controls on the TV itself. Now that I have fixed the remote, I found out that there is no difference!
There doesn't seem to be any option to scan frequencies with this TV. I have plugged a DVD player in, and it just finds it. However, on the TV I tested the Amiga on, which is about the same age, I had to scan and tune the signal in.
I haven't had to do anything and it's fine!
In fact I have just loaded up Workbench, and that is fine too! Can't believe it!
Perhaps the game disks I have been trying have just become dirty?