Faulty 42” Tv (Ashburton SE25)

Faulty tv without remote control.
Tv comes on and stays on for roughly 10-15 minutes. Screen then goes black and sound is still active. Have done all troubleshooting. Factory reset, powering off, leaving off pass recommended time etc, but fault is still there. Might be that backlights need replacing as you can see image when screen is black and light is shined on it.