Samsung qn55q80BAF Restarting / no picture only sound

Hello! First, thank you for this amazing site—it’s a fantastic community. I have a question regarding my Q80 TV. Initially, it started with two red blinking lights, followed by constant restarting. I replaced the power supply, but that didn’t resolve the issue, so I reinstalled the original board. After doing that, the restarting stopped. Now, I can see the backlight is on, and I can hear the TV’s audio, but there’s no picture. I’ve been told this might be an issue with the TCON board. Has anyone else experienced something similar? Thank you for your help!