It depends on where the burn, in general, the mobile phone motherboard is not bad, and no matter what part of the mobile phone motherboard has a problem, it can simply be called the motherboard burned
If the motherboard is burned because the memory chip is blown up, the data does not exist, even if the flash area data of the chip is still in, the conventional way is not read, like polishing the chip scanning chip this unconventional way, these sideways are not reliable
If the CPU is broken, the storage is still good, then the data will be safely saved on the memory chip, if the data is not encrypted, then you can read the data in a conventional way, this is binary data, just carry out file system analysis, you can get the original data, if the data is encrypted, you can get the binary data, and then decrypt the original data. But decryption is slow, especially now that passwords are so complex that basic brute force cracking is impossible
If other components are broken, such as the power chip exploded, or just the PCB line is broken, then which one is bad, which can still be turned on, but the repair of the phone wants to save more and make more money, directly let the whole motherboard just