If the lines appear only when playing a particular Nintendo DS or Nintendo 3DS game, please visit the Troubleshooting section for Nintendo 3DS software.

If the lines are present all the time, please check to see if they are superficial and whether they change in appearance when the viewing angle, or angle of the light, is altered.

• If the lines indeed appear to be superficial and a protective sheet has been applied to your screen, they could be caused by scratches on the protective sheet itself. If any kind of protective sheet has been used, please try to remove it carefully.
• If the lines are not superficial, if no protective sheet was used, or if removing this sheet did not solve the problem, the screen itself is damaged.

Click here for detailed information on repairs of Nintendo products.