sorry, but if I have the 3.3 v of the power LED which flashes and there comes a time that stabilizes but does not start the tv
Well, download the diagram here.
https://www.electronica-pt.com/esquema/tv/lg-esquemas-tv/lg-32lg30r-chassis-lp81a-17811/
on page 14 begins the guide to identify the fault, study and comment