Reply To: Potential solutions to some Hi10 Issues

[kravmama1]

 

UPDATE TO BLACK SCREEN ISSUE

This applies to tablets that have charge in battery, but has black screen.

There seems to be 2 situations.

1. Screen is black, can’t shut down or boot up.
2. Tablet boots up to black screen.

Screen black and won’t shutdown/boot up

This is known to occur on several different tablets/laptops after update to Windows 10. This is most commonly associated with the tablet going into sleep mode and not waking up. This is associated with issues with drivers incompatible with Windows 10. To recover the tablet, one must attempt a forced shutdown, then reboot. Here are some suggested methods (each number is a different method) and explanation of what is happening:

1. Hold power button for 30 seconds or longer (this attempts forced shutdown). Let it sit for 15 seconds. (this allows it to run any shutdown routine and achieve a full powered-down state).Push power button for 5-10 seconds (this attempts to restart tablet after shutdown).
2. Hold power button for 30 seconds (this attempts forced shutdown). Push power button + volume up button for 15 seconds (this is called the 2-button  forced shutdown). Let it sit for 15 seconds (this allows it to run any shutdown routine and achieve a full powered-down state) . Push power button for 5-10 seconds (this attempts to restart tablet after shutdown).
3. If you had previously configured a USB mouse or keyboard to awaken the tablet from sleep, attach the device and push any button or key. People who have the original docking keyboard are able to wake up their tablet by redocking it because when first connected, the keyboard  was automatically configured to be able to wake up the tablet from sleep. The tablet will not respond to a bluetooth mouse or keyboard, because the tablet disables bluetooth mice and keyboards in sleep state to conserve battery ,and this cannot be changed in device manager settings.
4. Attach a USB keyboard. Press Ctrl+Alt+Del (self-explanatory). then push up arrow key once (this takes you to the shutdown icon, but you can’t see because of the black screen.). Push Enter. Wait 15 seconds (this allows it to run any shutdown routine and achieve a full powered-down state). Push power button 5-10 seconds (this attempts to restart tablet after shutdown).
5. Sometimes anything attached to the tablet can prevent it from waking up. Disconnect all attached devices including power cord. Hold power button 2 minutes( to force shutdown). Wait 30 seconds, then press power button again 5-10 seconds (to restart).
6. Draining the battery fully will shut down the tablet but can cause problems, so do this only as a last resort and at your own risk. If battery is fully drained, it may actually take a few DAYS on charger to be able to recharge it again.

Once you have recovered your tablet, you can try to prevent this from happening by:

1. Change settings to disable sleep mode completely. However, keep in mind that this will drain your battery faster and you would need to manually shutdown the tablet after each use.
2. Update BIOS (be careful not to brick the tablet).
3. Update graphics driver if possible. The Update Utility won’t work. There is not a downloadable updated driver for Z8300 processors for Windows 10. My tablet was pushed a driver update on 3/02/16. See if your tablet’s driver was updated as well.
4. Exit out of all programs before entering sleep mode.
5. Configure a USB mouse or keyboard to be able to awaken the tablet from sleep.

Tablet boots up to black screen

You may see a  the Chuwi logo for a few seconds followed by a black screen. You may or may not see a mouse on the screen This has been an issue on other tablets besides Chuwi tablets on Windows 10. What is happening is that the lockscreen is appearing as a black screen.

Press Ctrl (this takes you to the PIN/Password input screen, but you can’t see it). Enter your PIN/password, then press enter.

If you still have a black screen after that, then force shutdown with power button held for 30 seconds or power+volume up for 15 seconds. wait 15 seconds, then power button for 5-10 seconds to restart .

To prevent this from happening again you can try updating BIOS/drivers, disable fast startup or other methods described in this forum:

http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/windows-10-final-build-black-screen-after-boot/6c216e14-a112-461e-9faa-62594e195b13?auth=1