LCD does not turn on, after seeing boot screen.

Hello,

I have repaired an iPad who had a defective battery, after replacing it, the iPad turns on correctly, you see the apple boot screen, then it turns off.

I can confirm the iPad is on and running, but LCD stays off, it only work on boot.

I tried restoring it, it did not change the issue.

Battery is charged, and all calbes seem correctly attached.

I did a search and did not find any subject with similar issue.

I'm guessing it can be a software issue.

Or my other guess is the battery/circuit isn't giving enough power to the LCD.

I would be glad if someone could please help me