Why my MacBook Pro unibody late 2011 don't turn ON at all?

One day my macbook pro stop running. A technician has check the memory, the power and other part. But the macbook pro doesn't go on. He tells me that the logic board is faulty.

1- how can I chek the logic board and diagnose it?

2- how can someone help me?

bollestore@gmail.com

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Were you going to tell us about the liquid spill?

there is no liquil spill.

when i turn ON nothing appears on the screen

when you boot it does the screen turn on, if so what does it display?

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Reset your SMC.

Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).

Shut down the computer.

Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.

On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.

Release all the keys and the power button at the same time.

Press the power button to turn on the computer.

Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

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no result after smc reset

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