The LE37A659 has a T-Con T370HW02 or similar. Find the T-Con number and search for the spare part on the internet to replace it.

If you want to try to solder the AS15 chip yourself, it's the one marked red in the picture. Most similar TVs by Samsung have that chip, too, but the location may differ. You can buy it as spare part on ebay.

I did not do the SMD soldering part myself (someone nice did it for me instead), but if you want to do this yourself here are some good pictures how to do it: https://www.berlin-repariert.de/t-con-re...