My Samsung Television Keeps Shutting Off

My Samsung TV (Model HLS6186WX/XAA, Version PF03) keeps turning off after a few seconds. Months ago, a similar issue occurred, but the TV stayed on long enough to adjust settings. Randomly changing settings and unplugging/replugging cables eventually resolved the problem.

Currently, the TV powers on for 5-10 seconds before shutting down, preventing access to the menu. Power cycling the TV multiple times hasn’t helped. Before shutting off, the bottom lamp indicator light flashes or turns green. After the TV turns off, the “Standby/Temp” light flashes red, while the “Timer” and “Lamp” lights flash green.

This issue is incredibly frustrating as the TV is essential for my family. Any troubleshooting advice would be greatly appreciated. We need to fix this problem without purchasing a new television. What could be causing this issue and how can I resolve it?