Ds lite flashes on but fuses are ok
One or both your screens have blown.
Try removing the motherboard from the screens and attach the battery the green light should turn on and stay on.
Now attach the lower screen and turn on. If the screen is ok the screen and green light will flash and then turn off. (if the screen doesn't flash the bottom screen is you're problem and will have to be replaced)
If this happens the problem is then you're top screen which you will have to replace.
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