The iPad 3 loses power on and doesn't show up. There are many causes of power failure. Or drain the battery even though the power is off and the battery still drains. Here are the iPad 3 tests that lose power due to Vbatt touch
How to determine iPad 3 power loss due to Vbatt voltage on main.
- The machine is using suddenly power down. Plugging in the charger does not show anything.
- Unplug the machine and check the power supply, the power supply beeps.
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