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Here I have a Lenovo Tab 4 LT and let me show you how to enter the hardware test mode on
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the following device. So at the very beginning let's start by pressing the power key, keep holding power button
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choose power off and tap OK to confirm it. Let's wait until your tablet will be completely switched off and afterwards you need to use
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the following combination of keys. Power key, volume down and volume up
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So let's hold down together these 3 keys, power key, volume down and volume up
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Keep holding those keys, release them as soon as Lenovo logo pops up on the screen
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Let's wait a couple of seconds until the hardware test mode pops up in front of you
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And this is the Lenovo test menu, as you can see here you can perform the following tests
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So here you can for example see the LED red, as you can see the LED red is highlighting
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let's choose pass. You can test other things such as the key, the volume up, volume down, power and other
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stuff such as the vibrator, the device is vibrating, let's tap pass
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You can also test the LCD, audio, camera, touch, battery, sensors, SD card, CPU, memory
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WiFi, FM, Bluetooth, GPS. You can also see here the test report, that's it
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You can perform run all, so you can perform some automatic tests and test all of the following features
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And if you would like to quit this mode let's simply choose reboot
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And here let's decide if you would like to reboot to this mode, reboot to Android or
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shutdown the device. In my case let me reboot to Android, tap OK, that's it
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Right now the device should reboot into the Android, but let me do it again
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Let me tap OK one more time and this time the tablet is restarting into a normal mode
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Let's wait a couple of seconds. Excellent, now your device is ready to be used, so everything went well
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