What a pity.
You don’t state which version of the BV7-40 you have – and also not where you are located.
In my experience it is not worth it to bother about repairing these old tv’s.
There are plenty of preused BV7-40’s out there at a very low price.
Swapping out the tv should be fairly easy.
Tip! If you buy it from a dealer, he should be able to upload the PUC codes, that you’d need.