It doesn't look like LCD panel - that is good news.
Clean the LVDS contacts and check for correct power supply rails. If still the same I would look at replacing AV processing board (main board) - one that has tuner module on it.
The best, quickest & cheapest way to conclude on the problem is to obtain the Service Manual. Just don't ask your friend to help you read the circuit diagram....
If my suggestions mean little to you, ask the authorised service department to repair the TV.