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TV unable to detect signal when video stops
#1
I have an Android box running CoreElec, been running 2yrs without any issues until the past week.

Few times I turned it on, I had a weird aspect ratio and only green showing. I had that once or twice before on my PC when cables loose to the monitor, checked the HDMI and seems fine... may be related, may not, happened a few times and not again all week.

I'll be watching a video, and when it stops and the resolution/refresh switches back to the main Kodi screen it goes black a few a second as it normally does, then flickers to Kodi... but lately it flickers black, sits a bit then says no signal found on my TV. 

Kodi is still working. If I click play on the remote the video will come up and play. Shut the video off, and back to no signal. I even brought the video up, went to the main screen with the video playing in the background, picked a different video, switched to that and clicked stop, and right back to no signal.

Checked cables, updated the Android box even though I bypass Android with an SD card, formatted the SD card and reinstalled all the software, and opened the box and replaced the thermal paste because the original was old and crumbling. Immediately had the issue.

CoreElec had this issue I guess 2yrs ago after an update, and the 3 "solutions" were to get a better HDMI cable, set the Kodi resolution to 1080x1920 at 60hz, or something about colour mode? 4:2:2 I think it was? I replaced all my cables last summer when cleaning up because no idea what cables were good or bad or which versions, so all new HDMI, current version and the hdmi.org certified sticker. Resolution was however set to 4k. I reset to 1920x1080 and for the past 36h I had no issues at all. Tried all sorts of videos even ones I know caused the error.

Then, I was watching a YouTube video and when it ended, the no signal message came up.

Pulled the power, started up again and resolution back to 4k?

I reset to 1080p, rebooted and checked and still 1080p. Played a 4k video for a few minutes, switched back and still shows 1080p. Played the video that last caused the issue on YouTube and no problem, and still shows 1080p.

So... not sure what's going on. Is something resetting it to 4k which is causing the no signal error? or, when I get the no signal, does that cause it to reset to 4k upon reboot?

Didn't get far on CoreElec's site, sounds more Kodi but no idea. Any ideas? is there a way to "lock" it at 1080p?
System 1: HK1 RBox - Android 11, S905X4 Quad-Core, 4GB DDR3 - CoreElec KODI 20.3
System 2: Beelink GT1 Ultimate - Android 7.1, S912 Octa-Core 1.5 GHz, 3GB DDR4 - CoreElec KODI 18
Storage: WD MyCloud EX2 Ultra NAS - 2x4TB WD Blue (WD40EZRZ)
Display: 55" TCL 55R615-CA 4K TV
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#2
I'd say it's probably more of a CoreELEC issue, however if you post a log file here we will probably be able to see where & why it's falling over.
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#3
Hmm... maybe fixed itself? not to jynx it or anything...
System 1: HK1 RBox - Android 11, S905X4 Quad-Core, 4GB DDR3 - CoreElec KODI 20.3
System 2: Beelink GT1 Ultimate - Android 7.1, S912 Octa-Core 1.5 GHz, 3GB DDR4 - CoreElec KODI 18
Storage: WD MyCloud EX2 Ultra NAS - 2x4TB WD Blue (WD40EZRZ)
Display: 55" TCL 55R615-CA 4K TV
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TV unable to detect signal when video stops0