The TV is in standby mode.
When the blue indicator of Hisense LCD TV lights up, but the screen is black, it may be that the TV is in standby state. At this point, just press the standby button on the remote control to wake up the TV.
hardware fault
If it is determined that the problem is not caused by the standby state, it may be a hardware problem, such as switch circuit failure, power module failure or high voltage board failure. It is suggested to contact Hisense's after-sales service directly to conduct a comprehensive overhaul of the TV set.
It's still not on the screen.
If the screen is still not displayed when the blue light is on, you can try pressing the channel or standby button on the panel. If it still fails to start, it may be necessary to further overhaul the internal circuit of the TV.