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there is likely to be a short between bottom screen and motherboard or one of the motherboard components needs replacing. difficult to pinpoint without having it in my hand. as the bottom screen been replaced just recently?
Well, looking at the diagnosis there are two possible problems. You could have both, or just one. Here they are and the solution.
1. Blown F2 fuse. The F1 and 2 fuses get blown most often. Between the two, it is the F2 if the system charges. Here is a website that will teach you how to solder it back together. This site has old and new DS systems on it. Before you solder make sure to check that it is broken with a multimeter. http://www.m3wiki.com/index.php?title=Nintendo_DS_Lite_:_Repair_a_broken_console_(blown_fuse)
2. Misconnected Ribbons. The easier, and more common problem is that a cable isn't in all the way, or it is crooked. You should just check all your ribbons, and double check them. Take them out, put them in again, make sure all the fixings (little black things that hold the little ribbons) are in, and the snaps are snapped. If you have lost a fixing, just post and say that and I will tell you how to MAKE a new one.
When you take off the bottom case, and lift up the pcboard and lower touch screen, you'll see the ribbon cable connected there. It's held in place by a black connector that lifts up. Use something like your fingernail and life up on the black part until it releases (it shouldn't take too much pressure to lift it up. Once you do that, the cable pulls directly down and out.
Make SURE what when you put it all back together that you make sure to seat the ribbon cable back in there as far up as it will go. If you put it together and all you get is a bottom screen that flashes and it won't stay charging, I'm 99% sure that it'll be that connection isn't in there far enough.
I had to troubleshoot 2 of mine doing that recently. Found out that it was the cable that wasn't in there far enough. Once I put it in far enough, they worked like charms.
Your problem is with the LCD behind the touch screen. The bottom scren on your DS is actually two screens. An LCD and a touch screen on top of it. Either your cable has come loose inside the DS or the LCD is possibly bad. This can be fixed.
The other option is that the electronics feeding the LCD have gone bad in which case you might as well buy a new DS. But check the screen first.
If the DS is under a year old you can send it to Nintendo for free repair.
These cables or ribbon cable and wire connects directly inside the upper LCD monitor. it is not feasible to replace these wires only. I suggest you see about getting a replacement upper LCD screen which will give you the wires you need and a new screen to boot. Another porblem is the case itself is very hard to disassemble. You will come near destroying the case to ge to the lcd. You must disassemble the unit fully and put the correct curl in the ribbon cable to get it to fit right. In short, the price being what it is for a replacement LCD, and the trouble you have to go though to get this problem fixed, It may not be totally worth repairing. If you dont care and wish to do a repair, then my wishes for luck are with you.