Chosen Solution

the digitizer is working fine i think, the body of the phone is also working, but the actual lcd will not light up. this is why i say “i think”. what can i do? i have the oem screen and the replacement screen, ive tried connecting both, disconnecting the battery, disconnecting what seems to be the board the lcd connectors are on, and disconnecting the battery and plugging in the phone, yet nothing has worked.

Does it have any water damage on the motherboard at all? Sometimes if the connector points on the motherboard are bad (even the slightest pin or pins) it can malfunction and not work at all..