If you have checked all the connections and the phone still does not turn on, try to charge it wirelessly. If it responds and charges, then perhaps the charging port you replaced the original with one that was broken. This is great, and you can just replace the charging port. If the phone does not respond or charge wirelessly then it is quite possible that it got harmed by ESD. Plastic tools help, but scewdrivers and hands can easily harm a device like this.