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Rtx 3090 hdmi socket seems too shallow.

Said it right there, similar to what OP said cold booting. With my C9 now and then upon first cold boot TV will show bios screen then screen after that. At point it goes into windows no signal shows up. Do a reboot and goes in fine.

weird, hope I haven't seen that issue yet - though I don't do cold boots my pcb stays on sleep for a year at a time
 
Said it right there, similar to what OP said cold booting. With my C9 now and then upon first cold boot TV will show bios screen then screen after that. At point it goes into windows no signal shows up. Do a reboot and goes in fine.
fine here on 3090 + lg cx (lastest formware on both)
 
what firmware you on i believe mines 03.11.30

you have a CX so would not compare. That said your message did prompt me to double check, can see one newer firmware is out for the C9 so may try that. Don’t expect it will help though given prior firmware came out only last month after fixing some ampere specific issues.
 
I’ve got latest firmware for C9 05.00.03. My replacement 3090 is due for delivery tomorrow so I’m hoping this will fix the handshake issue with the C9 but I’m doubtful as I think it’s on LG’s end.

I’m in contact with their technicians to try and remedy this issue
 
I’m well within my rights according to 2015 consumer act. Within 30 days and it was faulty, not fit for purpose

Look if the worst comes to the worst and they say you broke it then you are down one port. You have others. It's a bum but it's not the end of the world.
 
That’s the thing though I wouldn’t have others as it only has 1 hdmi port. The others are DisplayPort which LG C9 doesn’t.
Not an issue now anyway as they’ve sent a replacement which is due tomorrow
 
I’ve got latest firmware for C9 05.00.03. My replacement 3090 is due for delivery tomorrow so I’m hoping this will fix the handshake issue with the C9 but I’m doubtful as I think it’s on LG’s end.

I’m in contact with their technicians to try and remedy this issue

Yeah that's firmware I had. Following the post above about firmware on the C9, updated to 05.00.10 and no change. Do suspect as you say odd C9 quirk / handshake issue for some.
 
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