Chosen Solution
I have a iPhone 6 that sat on the charger for about a month after that it wont turn on. I replace the battery, dock connector and the screen. It still did not work. I swapped the logic bored to a working iPhone 6 and it wont turn on.
Since were both 90% sure it is a logic board problem, your best bet is eBay. You can search iPhone 6 logic boards on there or IFIXIT has their own logic boards but they don’t have T-Mobile as an option. iPhone 6 Logic Board
