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Redmi XMG1902-BR notebook can’t be repaired without power on
The standby chip is hot, and the short circuit of EC causes LDO 3.3 to be pulled low; Judging from the problem on the EC side, I found that there was a needle attached to 5V, which caused the EC to burn when it was powered on. Pins are broken, and then an EC is changed. The boot is normal, and the fault is eliminated.