Argon one M.2 Case HDMI issues

I have just received my Argon One M.2 case and overall it looks very impressive. At the moment I am having problems with the HDMI output from the SATA expansion card. I seem to get a maximum of 1024x768. Tried this with both HDMI 1 and 2, three operating systems and various HDMI leads. If I disconnect the expansion card and connect directly to the mini hdmi sockets of the Pi 4 all is well and I get 1980x1020. I am surprised because I thought the expansion card was just a pass through for the HDMI connections.

Any ideas or is this a return to base issue?

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Hey Norman,

Welcome to the forum!

I came across this topic on the Raspberry Pi foundations forum. When using RPi OS adding hdmi_force_hotplug=1
to the config.txt got some users back on track

Let us know how you go!

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Hi Liam,
Many thanks for posting this link. I tried the hdmi_force_hotplug=1 but to no avail. I was interested to see that other users have experienced the same issues. When I think about it, if the bare pi 4 works with the micro to HDMI cables, then the expansion board is just a replacement for the cables and should work as a direct replacement for the cables. My guess is that while the Pi4 can read the EDID of the monitor, for some reason this is not the case with the expansion board fitted as the highest resolution that I can get is 1024x768 which is in line with the other people experiencing this issue. The Argon one M.2 sata is a great case and obviously works well as reported by many satisfied customers. My conclusion is that occassionally some of the expansion boards are faulty and that I have got a faulty board.

are your HDMI cables “HDMI 2” compliant …??
it does seem odd though
i just looked here…for configuration hdmi-force settings to add to the config.txt file…you really only need a couple of lines of code added for most screens
hdmi_group= 1 or 2
hdmi_mode= which ever resolution best suits your screen…from the lists mine was 16

your screen may also be native 720 and not 1080…the page gives you the listings…

also do you have multiple devices connected to your screen try just running the rpi alone into the screen using the HDMI size changer…!!..board…

Hey everyone,

I’d check out this tutorial, it just extends on Liam’s info a bit, we’ve found this clears up most issues with the Pi displaying over HDMI!

Hope this helps!

Does sounds like it’s probably an EDID issue. If it were a poor connection and the resolution were being limited due to a high error rate, I suspect you’d be stuck with a different resolution.

To force 1080p output you can try:


hdmi_safe=1 forces 640x480 @ 60Hz

Something else you can try is changing the order in which you’re powering on your monitor and Pi; see

I’d also suggest trying these steps with the Pi in and out of the case:

(from Video options in config.txt - Raspberry Pi Documentation )

If none of that works, it could be a bad trace or solder joint on the HDMI pass-through board, and it’d probably be time to look at doing a warranty claim tbh. There’s an awful lot going on in HDMI, check out this if you get time:

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Many thanks for all the helpful suggestions. I have worked through them just in case but I have not been able to sort out my issue. Perhaps I should explain more fully the setup. I have a Pi 4 8GB and use a mini to full HDMI adaptor with a HDMI 2 cable connected to a Philips 24" monitor. The Pi4 recognises that it is a Philips monitor and it works prefectly with full 1980x1020 resulation. If I replace the micro to full HDMI adaptor with the Argon One expansion board wth everything else the same, it does not recognise the monitor type and I get a maximum of 1040x768. My conclusion was that the Argon One expansion board is faulty and will be sending it back for Core to check it out. Once again many thanks for everyones contribution…
PS Oliver33 the HDMI article is very informative and well worth a read.


when you get the replacement board if your still having issues pls read below…
these are all that is needed for most default size screens that comply to 1080p

add these lines to your config.txt file around the middle height of it will be ok …
ignore the commented out lines they are for
instructional proposes only…

#   hdmi_drive=1 "no sound dvi mode invoked"  
#   hdmi_drive=2 .. "hdmi sound invoked"   e.g sound via hdmi port 


also another possible issue that may produce the false failure of the extender card is that one screen is native 720p and the other is native 1080p…this may confuse things…?? and dont forget that when 2 screens are used the fps drops to 30 fps per screen…


Thanks Brian86770 for responding to this post. I returned the Argon One M.2 case and Core Electronics confirmed that the problem was a faulty expander (daughter?) board. A replacement case is on its way and I will report back when I receive it.


HI All,
I have just received a Argon One Forty Case a few days ago, I have also cuffed the same problem, I am convinced there is an issue with the riser card as I have another Argon One that utilises the mini HDMI ports, for which I tried this rise in the Monitor is behaving perfectly, this then led me to dismantle my other Argon One Forty Case with the full size HDMI ports that work correct and yep it works correctly in this troublesome case.

To me it appears as it is definitely a manufacturing issue…



Hi Matt,

Welcome to the forum! Sad to see you’re starting on a frustrated note!

If you’ve bought an Argon40 ONE or any other product from us and you suspect it’s faulty, send us an email to the address on our Contact Us page and we’ll jump right on it!


Just to close the loop with my Argon One M.2 case. Core Electronics confirmed that it was faulty and supplied me with a replacement case. I am very pleased the Argon One M.2 case, so much so that I bought another one. I also used Core Electronics 3D printing services to print vesa mounts for the Argon One M.2. Many thanks to everone for their comments and helpful suggestons.


Hi Norman,

Fantastic to hear! I’m definitely picking up an Argon the next time I need a case for my Pi.

Good to see 3D printing solving real world problems too!


Thanks for the thread. I have the same issue except I am using a Samsung monitor (not Phillips) and in my case the HDMI signal is not being received at all. Mini DVI from pi works perfectly and HDMI type A cable works with a Intel NUC. Looks like an issue with the daughter card.

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Hi Chandi, Welcome to the forum!

If you suspect you’ve got a faulty daughter board (i.e. you’ve tried different cables and screens, and without the daughter board), flick us an email with your symptoms to the address on our Contact Us page, and we’ll go from there…



Hi James, Thanks for following up. I spoke to your support last week and the case is making its way to you though all the lock downs.