GPU/Monitors issue.

[RabidUrko]

Using a Samsung 42" S90F for a playfield connected by HDMI (cable 144hz) to an RTX 5070

and a Dell 4k Monitor for a backglass connected with a DP cable (yes overkill but from a previous cabinet).

 

Monitors are setup fine as windows identifies no problem, however if i have the backglass monitor turned on , the

playfield will just go blank (no issue with the tv), if backglass monitor is turned off the playfield comes back on again.

 

DMD monitor works with the tv playfield no problem.

Im going to try a DP cable to HDMI (144hz) for the playfield to see if the GPU looks for a DP first, ive read that it shouldnt though.

 

Anyone had similar issue or thoughts? cheers.

 

 

Edited July 5 by RabidUrko

[deadmanworking]

Maybe stupid question but are the display set to "extend"? 

[robertms]

6 hours ago, RabidUrko said:

Anyone had similar issue or thoughts?

 

To troubleshoot, have you tried forcing both monitors to 60hz?

[RabidUrko]

Had all 3 up just now but cant remember how i got there lmao.

Ive only been messing about with refresh and unplugging leads back and forth to the 

GPU, so it will be something to do with how the 5070 is "finding" the monitors.

 

Probably some issue with this model  tv connecting imo with a PC.

When i had all 3 monitors "found" by windows though i could not persuade it to make the tv display 1, it had to be 2.

 

Im waiting on the DP adaptor in post  (make a DP port into another hdmi for GPU) to connect the tv via DP and ill see if that makes any 

difference.

 

@deadmanworking yep i setup a cabinet once before.

Was just 3 standard monitors.

 

Why dont Nvidia make the ports two hmdi and two DP i wonder?

If you need (or possibly) 2 hdmi you stumped without adaptor.

Edited July 5 by RabidUrko

[Thalamus]

I had to buy a adapter for my 4070 ti. Main PF is a LG TV. What I simply do is to make sure that the TV is turned on before I start the computer. IF I leave it for a long time and I haven't bothered to change spend time on it. The TV might go into pixel refresh and THEN it can be that if I wake up the PC it will pick the backglass monitor as main. IF that happens, it is much easier just to reboot the computer instead for fiddling with the setup.

[RabidUrko]

All turned on already before PC boots, ill see how if the adaptor affects anything, if not ill have to look more indepth.

[RabidUrko]

Its looking to me after experimenting that my 4k tv monitor doesnt like my 4k backglass monitor.

Right now i dont have a basic 3rd  monitor to prove my theory.

Makes no odds if i change refresh.

Im on the case.

 

Im only using the 4k as i had that as my playfield in my 32 inch cabinet.

Playfield tv/monitor  https://www.amazon.co.uk/dp/B0F6TQC9SX?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 

 

Backglass monitor https://www.amazon.co.uk/dp/B0F29SKXFQ?ref_=ppx_hzod_title_dt_b_fed_asin_title_0_0&th=1

Edited July 6 by RabidUrko

[RabidUrko]

 

Found im not losing signal on the playfield its just black lol, not used to Oled, seems the issue is the backglass wants to always be display 1 in  Windows.

 

Ill get there in the end.

Edited July 7 by RabidUrko

[Tesla1856]

2 hours ago, RabidUrko said:

 

 seems the issue is the backglass wants to always be display 1 in  Windows.

 

 

 

Then let it. Those numbers don't mean much as you define Primary in Windows. Plus there is the "HDMI vs DP at boot-time priority" thing. Anyway, port numbers really only affect where BIOS screen will appear but that should rarely used (and you can live with whatever as long as all 3 monitors properly work as a set in VPX).

[RabidUrko]

You cant, you need it to be 1 to extended properly.

Its some incompatibility between the present tv monitor i bought and the old 4k im using for the backglass,

as everything apart from the new playfield was form my old 32inch cabinet.

 

Ive set a cab up before , cheers for your input of help though.

 

I havent been able to swap and test the backglass yet.

Edited July 8 by RabidUrko

[Tesla1856]

On 7/7/2026 at 7:05 PM, RabidUrko said:

You cant, you need it to be 1 to extended properly.

 

 

This is a pinball-cabinet, so no Extending is required (or even allowed). Be sure all monitors are set to 100% Scaling (ie no-scaling).

 

The Playfield monitor you define in VPX-Prefs.

The resolution and Display-Numbers of the other two screens you define (for VPX and/or B2S-Server, etc) in ScreenRes.txt .

Edited July 9 by Tesla1856

[RabidUrko]

36 minutes ago, Tesla1856 said:

 

This is a pinball-cabinet, so no Extending is required (or even allowed). Be sure all monitors are set to 100% Scaling (ie no-scaling).

 

The Playfield monitor you define in VPX-Prefs.

The resolution and Display-Numbers of the other two screens you define (for VPX and/or B2S-Server, etc) in ScreenRes.txt .

Extending is required (in monitor settings), ive set a cab up before.

Appreciate your replies

 

What i did  find out (from the net) tonight that held me back as that RTX 5070 has a DP connection as its primary one.

It wont let you use HDMI for your primary tv/monitor, not if using more than one.

 

Sorted now , not sure what i was doing wrong, probably with this heat wave i was swapping cables about and not realising what i was doing, cab still WIP.

Edited July 9 by RabidUrko

[jcsk8]

Seems that you fixed, but I also had problems when I added a second monitor for backglass. Ramdomly windows showed in the second one. Solved it by simply boot the PC first, and than turn on just the main monitor. Than later turn the second one. No more problems.