The screen doesn't get illuminated.

The phone doesn't charge and doesn't going on.

I took off the screen and checked the charging circuit and the Charge IC's exit was normal

I removed the board and applied to the battery entrance 3.7v through the power supply. Then I put the charger on.

But apple's logo didn't show up and the screen started blinking.

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Are you getting any kind of heat from the the board? There might be a short somewhere preventing the device from booting.

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