Hello, that fault occurs only in the Samsung 40D from 5000 to 5500, be careful with this practice you will lose the 1080p but with the cable it will look great
in this old video the subject was highlighted, I fixed several teles with this fault
Dark horizontal line solution LED TV 40 series 5000 A 5500 SAMSUMG
answering your question is worth it for an economic solution, the ideal would be to change the panel but it is re expensive
best regards Tobias