Hi @Ricko_mcv Are the lines permanent and on all sources? Can you check that all connections are secure, could try reconnecting cables. However if errors apparent on Picture Test, Setings-Support-Device Care-Self Diagnosis-Picture Test it would need an inspection. it may be a Tv board failure it is advisable to obtain professional help via Samsung Support https://www.samsung.com/uk/support/contact/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
