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Androidタブレット用の修理ガイド

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Why my android tablet won't power on without connected to the charger

Hi I have an android tablet Virgo Allwinner. A33 and I can't power it on without to be connected to the charger what can I do for fix it? pls helps me guys

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HELP! My Xiaomi Mi Pad 4 with Android 8.1, less than 1 year old and a truly fully charged battery also doesn't want to turn on without being attached to the charger. It also abruptly turns “off” when the charger is detached.

I've done an interesting thing to know that the battery is fully charged . While turned "off" and not attached to the charger, constantly holding the "power & vol-down" buttons for a few seconds will cause the device to enter "fastboot" mode for 9 seconds during which the screen is active. I use rubber bands to hold the buttons constantly. Every 15 seconds the device enters "fastboot" mode. It takes 16 hours to bring the battery from 100% to 0% charge status. I've done this a few times. I recharge the device with it powered "on", recharging from 0% to 100%.

It doesn’t make sense that replacing the battery would fix this problem since the OS is capable of realizing the actual charge status of the battery.

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Some devices will power on while connected to a charger even when the battery is removed. You may want to try testing your batteries voltage with a multimeter. If it reads at zero volts it may have entered the protective sleep mode like Technology Dr mentioned. Most lithium ion batteries have a built in circuit to protect the battery from overcharging, discharging, and other environmental factors. If the battery is in sleep mode then you may wake it with a boost charge. There are some videos on YouTube that can show you how to boost/wake a lithium ion battery. The idea is similar to jumping a car battery. You supply the battery with a slightly higher voltage to wake it from sleep mode. A PC's USB port usually can boost a battery as it usually supplies a higher voltage than a wall charger. If the battery isn't turning on still then you may need to replace the battery or have the devices charging IC checked by a professional. Hope this helps and best of luck.

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ur tablet has gone into deep sleep discharge.

pls charge it and leave it for 30 minutes , before it boots up and then charge again, u may not get charging signal during sleep discharge. wait for it.

remove if turning hot, visit nearest service centre, may have MB short circuit.

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Thanks for the help I will try it and I will tell you later thanks for the help :)

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Thanks booth of you guys thanks for the answers :)

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Antreas54 さん、ありがとうございました!
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