"Do the lines appear on all channels, inputs, and programs?"
Switch the input of the television to see if the lines still appear on multiple inputs. Do the lines appear when the Menu or Home button is pressed?
"On which inputs do the lines occur?"
Check all steps again
Is this the first call for this problem?
If Yes: Continue with 1st Call Troubleshooting steps.
"Lines on the screen can sometimes be caused by the program itself"
Lets perform some simple troubleshooting steps to see if this issue can be resolved over the phone.
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