I have had to replace the blue charging point component due to damage. I removed the broken component and replaced the part last night. The unit powers on, but the screen is blank. I have tried holding down the C button (top most button on the left), with the SD card in, then switching back on, and let go for the C button after 3-10 seconds. No joy, I still just have a blank screen (back light is on).
I seem to have a very similar problem to what has been discussed here. The USB connector broke off from the LiPo charging unit after a couple of hours use (seems to have had a cold joint) and I decided to try and fix it. I managed to solder it back on, and the battery can now be successfully charged, however now I’m getting the blank screen issue as described. I can hear the sound, and after a couple of attempts at resetting it (holding button C) I was able to get to the game loader screen, but then it went blank again as soon as I tried to load a game. I can still hear the starting jingle though.
Can it be that I overheated something when I was soldering the usb connector? I checked for shorts and the battery works fine. Any help is highly appreciated. I bought the unit from UK retailer (now defunct)