Hey i think i got a solution, read the link i gave below credits to votahuan, its for adjusting screen flickers in both top and lower screen of ndsl, however i need you to do me a favor in return, hope you do not mind posting up the pics for me at firstname.lastname@example.org once you found the two hidden screw at ndsl, im just having hard time finding it in fat nds, so i need a rough i dea of where it mite be located. Heere's the link anyways :- LCD FLICKER SOLUTION
Open Ds and ribbon connection to touch screen needs to reattached correctly. Sometimes the ribbon connection lossens. Its located on the top and the DS. The ribbon is about 3/16" wide. The flickeren could be caused by a faulty top screen.
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first try to calibrate the touch screen.Take all games out turn on then go to the very small ds on the bottom touch screen. If you can't touch it move it with the cross down then hit a. Then select the option all the way to the right it looks like cross hairs that's the calibration screen fallow instructions. If that doesn't fix it it could be a broken screen or a loose ribbon.
Im really bad at describing things but I hope this helps xD
Please don't for the love of pete go buy another screen.You will only have the same problem like 50 times over.
Since the touch screen isn't working use the rrow keys and the "A" button to selct everything
Take the game out of the DS and turn it back on. Go to the options menu when the DS is on the main Screen(If you dunno what the menu icon is it's at the bottom of the screen about the centre.. the icon is a cute mini DS)
Once you are on the options menu go to the yellow screen and select it ... This is where you calibrate your DS.. i.e make the touch screen work again in most cases.
You should probably calibrate the screen weekly cause the DS is lazy and doesn't remember where the touch sensors are ..
umm.. i didnt see the video, but go on www.youtube.com and just search "how to fix touch screen". there should be videos that tell u how to fix it. i didnt see the video since my DS didnt have that problem..HOPE THIS HELPS!!!!!!!!!!!
i had the same problem and have now fixed it succesfully the touch screen works like a grid and is overlayed onto an lcd screen so that when you touch the screen it makes a conection within the grid so that the machine knows where you are touching .....if one of these grids are broken you will never calibrate your screen as the ds doesnt recognise what you are touching .....in short the answer is to replace your touch screen