It is found that the motherboard is burnt, and the resistance of USB 5V terminal is measured as 0. Cure the bone, scrape off the burned slab, and the resistance value comes back. Short circuit B3/A2 pin of Q5400, charging is normal, and the fault is repaired.
Xiaomi 10 Extreme Edition mobile phone touch failure, detection found that Capacitor damaged mobile phone touch failure, repair the failure after replacement.