Hello.
These Seiki usually have power supply issues after a few years. As well as eeprom issues... Does the blue light stay on? I suggest you try this:
1) Power on the TV. (blue light on).
2) Use a flashlight and carefully shine in the middle of the screen.
3) Press Menu on the TV buttons or Seiki remote. (the original one)
4) Do you see a faint picture in the background?
If yes, then your backlight is broken. I do not suggest a repair for a TV like this.
If you see absolutely no text though, it might be something else. If you are knowledgeable in electronics, you can always test for the correct voltages on the supply. If not, then bring it in to a trained technician. The issue is either the power supply or the EEPROM.