Help friends, control IRX-IR8M does not turn on

Good afternoon friends of the Deviation forum, I have the iRangeX IRX-IR8M control which worked perfectly with AA batteries, but I used a 650mha lipo 2s battery and it did not light anymore, I know it is not burned because it is reviewed by an electronic technician, I think it is a kind of blocking in the software, help please, thank you very much companions.

Buenas tardes amigos del foro Deviation, tengo el control iRangeX IRX-IR8M el cual funcionaba perfectamente con baterías AA, pero utilice una batería lipo 2s de 650mha y no encendió mas, se que no esta quemado porque lo reviso un técnico electrónico, creo que es una especie de bloqueo en el software, ayuda por favor, muchas gracias compañeros.

On mine it was a screw holding the pcb, that shorted out two tracks.
If you remove the back, then it is the screw on the bottom left(a black screw). i put tape under mine.

I will try and upload a picture.
Another thing, that can do this is if some of the pots or gimbals are storted out. It is easy to find out, just pull out all the plugs to the gimbals and pots.