My tv has power and blue lights show in the back but i get no picture or sound

dead power board

The unit has lost its green video information. This can be a picture tube or a green drive problem. The only colors you are getting are red and blue thus the purple picture. All picture tubes have red, green and blue guns to make all the colors needed for a normal picture. It will take some troubleshooting to determine whether it is a drive problem or the picture tube itself. Have a repair shop check it out for you. A 36" TV is worth a check out fee. Thanks for using Fixya. Let me know how it goes.

Ur convergence is dead,U know how to solders?Buy a convergence kit,replaced what in that kit.Here a website.Tv repair World.com,for the kit.

I have a akai tv, the tv went out but won't come back on. i'm still getting a red light but the tv just beep when I press the power button.

The indications that the power supply is going is when you start noticing flickering and sound like shorts when you watch TV...
I do not know how to answwr this without looking at it but first I will check again and follow how far you are getting electric to the board

Yep, your mainboard is damaged.

Replace it and your tv will work again

so i had the same problem. red light came on, but no blue light or anything on the screen. it turns out that there were some capaciters blown on the circuit power board. unless you have a good understanding of circuit boards, its not a quick fix. but for someone who knows their electronics, its not too hard, and its not expensive to fix, unless you bring it into a store. but the supplies needed arent expensive. good luck