My guess is that the TV is expecting a PAL signal - interlaced scan, 16kHz line frequency 50Hz field frequency, which is not what your PC video is set at. My HD ready TV has a PC VGA input specifically for use with PC video and that works fine.
Surface Pro 5 News - release date, UK price, features, specs
Microsoft Surface Studio hands-on review: the iMac killer is here
Best Mac antivirus 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.