I hava a PUK U5 welder machine, no power at all, fount MC dead (STM32F407ZGT6), replaced it with new one, but now the machine powers on with white screen, nothing happens, my guess is the the SRAM chip is fried too, but it has a weird enclosure, at least am not able to find datasheet... part number is LY61L102416ALL-12 but it is a 48 pin TSOP, and the datasheets on the internets, are 36 pins... any one can help me out???