I need to reprogram my Grundig TV There are lots of numbers, here goes, serial num, gulenar 26 h dip een000 oooo sn 70500792 8891705007928 een 812-b It is HD and digital. I have had it for at least 7 years and am hoping it can be reprogramed. When connected it gives the channel but says NO SIGNAL. I Hope you can help Thank you for your time fredabuttery@live.co.uk