Hi.
If the monitor dies completely , with no power at all, then you have a faulty power supply.
If instead the motor backlights shut off after a very short time, then the inverter is defective.
Sceptre monitors are built by Hitachi. Parts for this monitor are difficult to find because service manuals for re-tagged monitors are not available.
To find the part the technician can find the part number printed on the inverter board, or try calling a major retailer like
ShopJimmy.
Hitachi won't deliver support for no brand monitors.
Check also if there is a phone support number listed on the user manual.