The image on the display is tripled

[xEdelweiss]

Hello! Recently I've encountered several problems with my Spectre x360 (15-CH011DX).

The monitor sometimes triplets the image. At the same time, if it started normally, then everything will be fine until the screen goes blank (e.g., due to power settings or closed lid) or until I decrease the brightness.
The opposite also works sometimes - I can increase the brightness and it may stop tripling. It used to help to transfer the image to an external monitor for a couple of minutes and then back, but now the HDMI port has stopped working. Lucky me 🙂

And there is one more issue: elements that were open several (up to 5-6) hours ago can be seen on black background. Or vertical shadows after bright elements (mouse cursor, white text on the black console).

I suspect that the problem is not software, but maybe someone could suggest what it might be connected with?

[xEdelweiss]

So I took it to a local service center (not HP, not sure if there are any near me) and it turned out that HDMI works. Don't know why it doesn't work with two of my monitors.

Guys tried to check the connection between display and motherboard (or some otherboard) - no luck. But they found out that the battery has swollen. Yay 🙂