https://www.ifixit.com/Answers/View/744020/My+Mecer+LED+display+isn't+showing+any+visuals,+only+sound
Hi @liamxpearmain 4 years old is not old for a TV ;-) There's not much service information out there regarding the TV (at least that I could find) so first up...
led displaysolvedmecershowingvisuals
https://mecerintered.co.za/
Mecer Inter-Ed (MIE) provides training and certification as a learning partner for international Vendors such as Microsoft, Huawei, CompTIA, Veeam, and more!
accredited trainingmecerintersetasolutions