Skyworth 40e92rd TV is cold and slow to start. It takes 30 minutes to boot. Is it normal and hot?

In general, the starting speed of electronic circuits has little to do with the ambient temperature. According to the phenomenon you described, one possibility is that the solder joint of an electronic component on the circuit board is cracked and debonded. After the TV is turned on for a period of time, the internal temperature rises, and the TV can work normally again due to the phenomenon of thermal expansion and cold contraction of the circuit board. Another possibility is that the temperature characteristics of electronic components are poor.