Replaced screen but now no power

So I replaced the whole assembly on my MacBook Pro "12, now the computer will not power on at all. No indication of charging, I didn't use the battery disconnecter tool that ifixit sells. Any help would be grateful thank you in advance

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Please give us a history of the machine, damage and why repaired.

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Hi Mayer thanks for the reply. So the computer was dropped the screen got cracked, so I purchased the entire assembly, disconnected the trackpad, audio, and charge port connector, I didn't disconnect the battery. I replaced the LCD, put all connectors back in and I get no power no indication of power. It's literally does nothing. I feel as if I shorted something

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If you did not press the yellow button next to the battery before removing the trackpad cable, and you didn't disconnect the battery in some way, there is a high chance you have damaged the logic board.

Have had a few I've received from other shops who have done the same thing, but haven't managed to figure it out yet. On all of them however, none of the S4 rails start due to a missing PM_SLP signal required to activate them, which comes from the CPU.

Basically, a new logic board will fix the issue. Not exactly sure what on the board is the issue, but it has happened due to the battery not being disconnected and the G3H rails not being de-energized before doing anything.

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Robin will be eternally grateful.
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