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When i turn my phone on the phone will light up but the screen is either black or turns multiple colors, I have tried taking the battery out but no luck.

right… there is 3 most common issues to cause discolouration. 1 st - poor lcd connection to logic board ( either loosened up or has corrosion) 2nd - lcd matrix ic faulty. 3rd software issues. When did it startd? Does it gets recognised by pc when you connecting it?