my PN8500 has recently developed some vertical lines across the screen.. first it was just on the left side then i got 2 more in the middle and towards the right side of the screen. i went on thinking if i replace the main board which has the T-con build it that it would fix my problem. however it did not, replace the board vertical lines still there which tells me it is not the main board / tcon. i also checked all ribbons to ensure they are clean and not damaged. can any one provide some input as to what i should be replacing next to potentially fix the problem or is this a panel issue (if it is, i probably wont even fix it) and mount this TV in my patio. thanks for your input in advance.