LG E739 Brick

Hello, I have an LG E739 from T-Mobile (My Thouch 4G)
the device was working properly until the flex with the charging port along with the power button stopped working. I ordered a new flex on Ebay got it today installed it. the phone nether powers on nor changes shows up in usb devices as "qhsusb_dload" I googled a driver for it installed it now shows up as "qualcomm hs-usb qdloader 9008"
The device is basically dead I was wondering if there is anyway to revive the device or if the new flex is causing the problem. The phone worked perfectly before the flex gave out then I was unable to power on or charge.

:confused::confused::confused::confused: PLease Help