Won't turn on

On my second Blu phone ,1st was a g63 and the charging port came desolderd from the board and now the newest g73 or 72 I can't remember it's that new but one day I was charging it at work and on the drive home it shut off for some reason and had never turned back on not a light no beep nothing.Being these are both really cheap phones there isn't much information on line or spare parts so I'm down 2 phones in less than 6 months so any help would be extremely appreciated