UN58H5202 UN58H5202AF UN58H5202AFZXC
There are a few posts on this model on badcaps and a youtube video pointing to Q9101 Q9101C as the culprit. Part is 50R380 (N-Channel, 500V, 14A) Digikey IPD50R380CEAUMA1CT-ND. This transistor fails due to shorted LED backlights. If you just replace the transistor without replacing the LED strips, the transistor will likely fail again. It is recommended to keep the backlight level between 10-14 and never run it at maximum 20.