I also purchased this tv from currys for our caravanning holidays,but i will say i could adjust all the things you couldnt,our problem was the speakers were crackly,took it back the replacement was faulty it was channel changing and the volume was up an down without even touching the remote,took it back got another and it was doa when i got it home so i ended up with a refund!!!!
Awful rubbish tvs shouldnt be on sale!
Went and purchased a venturer 15in lcd from Tesco and its far superior and only a tenner dearer
Take it back get a refund