Huawei p30 pro motherboard replacement and disassembly vog-l29

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This video is for educational purposes only, and I am not responsible for any possible problems that may occur due to a lack of knowledge or equipment from the viewer's part. Please use only original parts, test them before and always put back the screws in their original place.
Sometimes phones are opened for the first time and sometimes phones have been opened before so they are easier to open.
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Does anyone know what the problem is, if you replace the motherboard, after it won't turn on, only the Huawei logo is visible?