this board had a usb port replacment. draws 0.47 amps but have a blackscreen. the cpu and nand area gets warms(not hot) like it runs. im missing 3.3v. it glitches with sxcore but hekate does not run. the nand seems ok. other nandmodul didnt help. filter on data +- has continuity. no continuity between data+ and data-. where is 3.3v generated? what to check next? thx!