MobileRead Forums - View Single Post - Interested in everything electronic, doing micro repairs

Squirrel61 · 10-10-2022, 02:55 AM

Hello all,

I've got a Kobo Clara HD here which has weird hanging issues. When booting the ereader, everything is looking fine. But after a short while, the ereader becomes unresponsive and the software hangs. It looks like some hardware watchdog is kicking in, because after a few minutes of inactivity and unresponsiveness, the ereader reboots itself and everything starts again. The only way out of this loop is to keep the power button pressed until the ereader shuts off. And when I turn it on again, everything starts again.

Now the strange thing is this. Suspecting a firmware problem, I've inserted an SD-card from a known good working Clara HD and it shows the same problems. The SD-card from this Clara HD works fine in the other one. So I got myself a replacement motherboard from a Clara HD with a broken screen and it shows the same behaviour of hanging after some time. I've done a few more swaps of things and the only conclusion I can come at is that it must have something to do with the display assembly.

The display itself is fine, it doesn't have cracks or pixel faults, it's just as perfect as a display can be on a used device.

Does anybody have any idea what can be the case here? Is it possible to solve? Or should I just forget about ever using this display assembly again and use the other parts for repairs?

10-10-2022, 02:55 AM	#1
Squirrel61 Junior Member Posts: 3 Karma: 10 Join Date: Oct 2022 Location: The Netherlands Device: Kobo Clara HD	Interested in everything electronic, doing micro repairs Hello all, I've got a Kobo Clara HD here which has weird hanging issues. When booting the ereader, everything is looking fine. But after a short while, the ereader becomes unresponsive and the software hangs. It looks like some hardware watchdog is kicking in, because after a few minutes of inactivity and unresponsiveness, the ereader reboots itself and everything starts again. The only way out of this loop is to keep the power button pressed until the ereader shuts off. And when I turn it on again, everything starts again. Now the strange thing is this. Suspecting a firmware problem, I've inserted an SD-card from a known good working Clara HD and it shows the same problems. The SD-card from this Clara HD works fine in the other one. So I got myself a replacement motherboard from a Clara HD with a broken screen and it shows the same behaviour of hanging after some time. I've done a few more swaps of things and the only conclusion I can come at is that it must have something to do with the display assembly. The display itself is fine, it doesn't have cracks or pixel faults, it's just as perfect as a display can be on a used device. Does anybody have any idea what can be the case here? Is it possible to solve? Or should I just forget about ever using this display assembly again and use the other parts for repairs?