Hey Benjamin,
First off all a big warning, the orange board might still have harmfull voltages.
if there is no standbylight, it’s 90% chance the powersupply board (orange one) that has some damage due to a powersurge. You need to rule this out first.
You should get it checked out at a repairshop for tv’s or get the board itself replaced. (Beware you need to use the boardnumber on the board in combination with the modelnumber of the tv to get the right part).
[br]
Ebay might help you out but if this all sounds new, get it to a repairstore :) they’ll give some warranty on their work too.
Kind regards,
Tom Damman
[https://www.herstelcenter.be|Herstelcenter.be]