Accidental lock Grandin TV

I locked my son's TV: GRANDIN 36cmm30 UVSH with my SPEEDY universal remote and he can't play on the PS or do anything at all. How can I unlock it?

On the front of your TV, press P+ and P- at the same time.

I have a 51cm screen (I think!), and similarly, I accidentally locked my TV.
I turn it on and it stays in standby mode, I press P+ or P- and the light turns green for about 10 seconds then goes back to red!
Yesterday, strangely, it restarted, a menu opened showing the lock programming mode. I didn't have time to unlock it before it shut off. And now I can't turn it back on!
And pressing P+ and P- at the same time doesn't work!
P.S.: I have an old TV model with a big box; I think they call it a cathode ray screen 'like for computers!
Any response???

I also have a locking issue with my Grandin 36cm television model 971. I did as Dauvergne indicated: pressing P+ and P- at the same time on the TV front, but it doesn't work. Thank you to anyone who could help me.

I have a Schneider TV with a VCR by pressing p_ p+.

Hello,
I have a Digiclass CTV-2128 TV and it's locked, please tell me how to unlock it.