17 Flat screen stays dark for a few minutes before...

Question

Then if I take a break for a few minutes it goes to sleep and now I have to wait a few minutes again for the screen to clear up. Sometimes it takes longer than other times.
Can I fix it or does it need to go to the shop.
And would it be worth spending money on it.
I can get another one for 100 dollars.
This is the one with the little bird on it.