Changhong umax living room TV suddenly blue screen remote control does not work, what should I do

Hello, could you please take a look at the following workarounds I said:

One is to see if there is a sound; There is a sound indicating that the TV signal is fine, check whether it is improperly adjusted or the TV is faulty. The absence of sound indicates that the TV signal may not have come in.

the second is to see if there is no blue screen and whether there are snowflakes; If there are snowflakes, the TV is not bad. There is no snowflake, no black screen, no sound, to see if the power indicator is on; Bright is the problem of the TV,If it is not lit, see if there is a problem with the external power supply,Eliminate the power supply problem is the problem of the TV。