u/EnvironmentCool1878

Hello everyone, I'm new in tech repair and I have this phone from Xiaomi that I recently repaired and it has this issue where screen was showing burn in picture that was slowly changing if left to static 1 also Image seems to be pixelated and screens seems dimmer , i checked my connectuon and everything seems fine but, touch screen is not working and the only thing this phone can function is by attaching a wireless mouse to it.

Is my display defective or I need to replace motherboard?