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the touch screen is grey color but still functional could it be the flex?

The touch screen have a grey color the light is fine,the touch is fine but it doesn`t show the colors properly i the ds lite opened didnt touch anything and after I close the ds the touch screen looked like that could it be the flex or something worse?

you can take it to a computor store to ask if they can remove and insert a new screen but you will have to take a new screen with you . As a ds screen is rare to find , ask nintendo if they have one or search for ds screens and buy a cheep one.Many part exchange dealers from EbaY have ds screens which are from a used ds but may have slight scratches on them. regards of this, the ds is classed as broken , sorry