You can always reset your tv for such kind of problems. However, most probably that won’t work for your case as you stated that the LED blinked like 6 times. The problem is I couldn’t find many resources on the internet for Hisense TV error codes. I found one where it is written that the LED blinking 6 times means malfunctioning mainboard or inverter. And for the good case, only malfunctioning LED. You can check the url I found if you want more information.
https://protroubleshooting.com/hisense-tv-troubleshooting/