Hi,I fixed some NDS Lites before and this is the first time I opened DSi and can't fix it. The problem is that when it turns on,both screen flashes and also blue light,then it quickly shuts off. First thing is of course-checking fuses. Both of them are ok. DSi is charging battery,on Multimeter it's says 4.15V (when fully charged),but I can't check mAh. I guess if battery is charging,then it's not the problem in battery. I tried turning on DSi with 2 different chargers with no luck. I spent hours on google and youtube,a lot of people are saying to check all connections. I reconnected all of them 3 times,and no luck. Some people said that it needs a new upper screen,but if it lights I guess the screen is ok. (?) Usually when screen is disconnected on NDS Lite,the other one flashes. So I tried to disconnect upper screen,and the lower flashed as expected. I don't have SD card in DSi,I guess it doesn't need it like in 3DS. What else can I do/check? Thanks.