 I bought a cheap china tablet and it worked fine for a few weeks. Yesterday while charging and using at the same time it got warm. I opened it and recharged the battery manually and it worked again. But it is not accepting any change through the USB port. Today I took a more closer look and found one IC was burned. The tablet is a BS109. Is is possible to know what this chip could be? I'm guessing some voltage regulator, since voltage at battery +/- should be 4.x Volts and now only is 2.5 Volts. I see only a 4 then a burned hole and a 0 and a 3 (4?03). On row 2 I guess it is year and week.