Thank you, XXXXX XXXXX line up and down or horizontal?
Also, what is the model number?
Does the Menu cover the lines or do the lines show through the menu?
White lines run up and down. RCA 32" Flat Screen Model L32HD31YX12 Covers the menu.
Thank you, XXXXX XXXXX board is suspect, if reseating the ribbon cables doe not help. You can view the T-Con board at this link.
What are the "reseating of ribbon cables"? Does this require taking the back off the TV and manually inspecting?
Yes, the ribbon cables go to the T-Con Board and should be re-seated to eliminate the possibility, although, the T-Con board is the common fault.