MBP will not power on

I am trying to repair a friends MacBook Pro which is completely lifeless, the most dead I have ever seen a MBP!

When plugging in the charger, it stays green indicating that it is fully charged, and I've tested the voltage of the battery which appears to be fully charged. However, when pressing the battery indicator on the base, it blinks for 5 seconds, which according to the apple website means the battery is flat.

I have tried resetting the SMC, disconnecting the hard drive and other non essential bits like the WiFi/speakers in case of some kind of short.

I've also tried booting it without the battery, and with the power pads (with the keyboard disconnected) to make sure that it's not the power button/keyboard at fault, but still nothing :(.

Could it be the case that whatever chip is in the battery has failed, preventing it from communicating with the logic board? Or a fault with the logic board itself? I also can't determine if this model of MBP is able to boot without without the battery.

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Should boot with just a charger plugged in, when you press the power button, so there is an issue with the logic board.

Remove the board and check for liquid damage. Clean if there is, if there isn't, you will need logic board repairs;

Plug the charger in when this is removed, feel the board (chips mainly) to see if anything is getting hot and shorting to ground.

If a chip is getting hot, use a multimeter to find which pin is shorted to ground, desolder the chip and see if the short is gone. If it is, replace the chip with a new one. If not, it will be a capacitor on this line.

If you have no experience soldering at this level, I would recommend sending it somewhere who can diagnose this for you.

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