How to repair mainboard

device can not working(boot) when i turn on the device.

when i visited repair center, diagnosed the problem is mainboard.

(samsung serive or repair) center said to me that the cost is 360 dollars.

it`s better to buy new one cause high cost.

so, i want to know how to repair(or replacement) mainboard for this device(Tab pro 8.4) myself.

or whatever similar one

thank you

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song921216, first you need to find out what is broken. So what symptoms does your phone have? What does it, or does it not do?

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