Couple of months ago I bought the 5 in 1 system, with the color screen. Since then, everything was working GREAT, I love the product, but last week I notice that the screen was not with the usual back light, that happened when it is unplugged, I checked and it was plug to the wall. I check the cable, and it was OK, I check the charger with a multimeter, and it shows 5 volts, as it should be. But still the screen is working with the batteries, since then... can someone help me, getting a solution???? THANKS!!!