teclast x98 boot-loop

[.oOOo.]

This is a repost from XDA. I did not get any replies there and I’m hoping someone here can give me some good advice. The link to the YouTube video is:

https://www.youtube.com/watch?v=9DT8CGlASJU

This morning my Teclast X98 battery was down to 5% in Android. I shut down the tablet and connected it to a charger. The moment I connected the tablet to the charger the tablet started to boot. It showed a red charging battery overlay and shut itself down again immediately. The tablet ended up in a bootloop from which there is no escape.

I’ve had this same problem once before. A couple of weeks ago I somehow managed to get the Tablet into BIOS settings, boot into Windows and perform a shutdown from there. When I shut down from Windows the tablet wil stay off when I connect a charger.

No such luck this time. After 50 or so reboots, with me trying to get into the BIOS settings, the pattern changed. Instead of showing the red battery overlay, the tablet would show warning messages that it could not display the red battery overlay:

ConvertBmpToGopBltofBATMonitor failure
GraphicsOutput -> Blt failure…

One thing that complicates this is that my tablet will not charge anymore when powered on. It only charges when powered off. So it now toggles between: Powered off and charging / Powered on and not charging. It’s a known problem when you’ve used a USB OTG charging hub. Read the comment section on that YouTube video. That guy has tried everything (and so did I).

[Michiel]

Can you post more info about the causing USB OTG adapter? At least, we can try to prevent it from happening to other people planning to use/using the same adapter.

[.oOOo.]

Banggood sells it and it’s also available from Aliexpress. Chris owns one too.

What happened to me is that the hub malfunctioned. If you connect the USB hub to the tablet it produces a very short click.  At one point the click repeated so quickly over and over again that it turned into a buzz. It lasted one or two seconds until I broke the connection but is was to late. The charging circuitry of my Teclast was fried and I was not able to charge it anymore whenever the tablet was turned on.

There were no warning signs. It worked fine until it fried my Teclast. It still works fine with my Chuwi Vi8 and Raspberry PI although I haven’t used it a lot afterwards.

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[Michiel]

Thanks! I just have a simple OTG USB hub which can’t charge the tablet, so I’m probably ok. Too bad your OTG USB hub fried your tablet though. I hope somehow that can be fixed.

[Author]

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