It is very likely that when the battery runs out, the battery will enter a sleep state, and it needs to be charged for about 15 minutes to activate the battery in order to have enough power to turn on. For Face ID iPad models, you can choose to press the volume plus button and release it quickly, and then press the volume minus button to release it quickly. Hold down the power button and wait for the device to restart. If you have an iPad with a home button, you need to hold down the home button and the top button at the same time and wait for the device to boot.
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If the above steps still do not force a reboot, you can charge the ipad for about an hour. After just charging, wait a few minutes, the ipad screen will appear charging indicator sign, if it does not appear, you need to check whether the USB cable and adapter are normal.
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Sometimes the location of the data line is not correct, which will lead to no charging, try to turn the data line over and plug it; Check to see if the data cable is damaged, find a phone to test it.
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If there is a problem with the data cable, you can go to the official website or a physical store to buy one
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First of all, open the back cover of the phone, and visually check the plug-ins, batteries, etc. on the entire circuit board, and the patch components on the circuit board, whether there are poor contact or welding places.
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If the above check does not have the above situation, then the problem has to be measured on the motherboard circuit, first of all to measure the motherboard on all the low-voltage differential voltage regulator chip output pin to ground voltage is normal, if normal, then measure the main control chip on the motherboard, the pin to ground voltage is normal, if there is an anomaly, check the chip around the abnormal foot components can be.