Why my gba screen turn white

When I switch on and off the gba many times, it turn white and no others colour, just only white. I open and close my gba because it cannot read my game. But the sound, screen brigthness is work properly.

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It start with many white line in the edge, the longer I play my gba, the longer the line. But when I turn it off for rest, the line is shortter. Then, the line become so many until my screen turn white