this post was submitted on 26 Mar 2024
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Interesting, I had ruled this out as likely because all 4 HDMI ports didn't pick up a signal, but I'll take a closer look at the board I pulled out.
usually you can get some form of signal flashing back at you if you jiggle the ports just right. And generally it should be pretty obvious when they have bad solder joints. They're usually completely loose and can be seen flopping about just a little.