Flashing LEDs can mean almost anything, from a dry joint to a
transformer failure, and are not a relaible guide. If I were you, I
would take the set to a local repair place and get a quote, based on
proper diagnosis rather than any internet guesswork. The inside of a
TV is no place to be if you have no electroncis experience.

And at the very least the diagnosis of a pro will tell you what part needs
replacement and you can then ask us here how involved it might be to DIY.
Heck, someone may also know the particular component on that board that has
failed, based on their history with that model.

good luck!