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Dell XPS 15 7590, released in 2019.

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Does anyone know if there is a fuse for the display?

Customer has this xps 15 7590 with a frayed display cable with broken wires. Was turning on / off when adjusting screen angle or opening & closing. Then stopped working altogether. Nothing but black screen. Laptop is still booting and I can blindly login. Got the factory replacement and it won't display either! I'm hoping the motherboard isn't completely gone and there's a protection fuse in line somewhere...

Someone please save me!

-John-

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Hi John,

Any chance this is a backlight issue? Tried the flashlight test against the screen?

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Jerry, No, this is a UHD 4k OLED screen...

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Ah, gotcha. Obviously not a backlight issue then. Welp, there are a lot of very talented people on here, so hopefully you'll get some help.

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J.R. Asprelli what does it show when you connect an external monitor (HDMI etc.)?

We need to know what motherboard this is and if you can, post some good pictures of it with your QUESTION. That way we can try and help you out further. Agregar imágenes a una pregunta existente

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@oldturkey03 beat me to the punch. @J.R. Asprelli If you aren't sure which board number this is, you can use section 1.1.3 of this very excellent guide to help identify which board number your customer's machine has.

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Hello all, the fuse didn't have voltage on either side so the short must have gotten past it.

The customer decided to buy new, and I had to return the screen because it's so expensive, rare and doesn't come apart so panel can't be used elsewhere...

Thanks to all that tried to help! I really appreciate the effort and the time you took sharing your skills, at least with your help the hdmi port works fine now, and it'll make a nice mini desktop for someone who needs it.

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Do you know where fuse is?

I haven't looked super hard but I have a clients laptop with damaged display cable from another shop reassembling it incorrectly. Displays via HDMI perfectly. Wanted to test fuse if applicable since my known working donor screen also didn't work.

Thanks!

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@J.R. Asprelli

To me no internal or external display means a video problem on the motherboard. Not even only a backlight problem as this wouldn't affect an external display.

The fact that it is booting means that it is passing POST so the video adapter must be communicating with the BIOS/OS but it has no output to either the display or the external display.

Can you get into BIOS with a display?

Asking this because the specs show that the laptop has 2 video adapters an Intel UJD 630 (integrated with CPU) and a discrete Nvidia GTX1650.

It would be unusual for both to be faulty.

Disconnect the HDD/SSD? from the motherboard and then check if you can get into BIOS on startup just in case "fast startup' has been selected and it bypasses the chance to get into BIOS.

if you get a display in BIOS check if you can disable the Nvidia display in BIOS at all and then see if you get a display on the screen after booting.

You may have a faulty Nvidia GPU

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@jayeff Yes it does have 2 GPU. Tried removing ssd and still no display, panel or hdmi at any point. I have a USB-C display port coming tomorrow just to see if I can get anything through that but I don't think it will run pre-windows for BIOS, etc. I believe it will plug & play with windows loaded... Will update when it comes in.

Thanks to everyone for your efforts so far!

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Upon further diagnosis, I removed the ssd to disable fast boot and now I get an external display with the panel unplugged. I also noticed a flicker on the screen while powering on and there is a display but no backlight. (I had done a flashlight test earlier but was looking at the top left of the panel, but it's 4k so the bios display is more centered and much smaller than full screen...)

Another thing to mention is that there is no mention of the nVidia GPU in the bios, just the Intel so this one may not have it...

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If there is a backlight in this screen I'd love to know where to check for voltage before I send the new screen back. I'm guessing that the motherboard isn't sending power but display chip is fine...

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@J.R. Asprelli

What is the make and model number of the display panel (original or replacement)? (usually found on the back of the panel)

If there is one search online for "(insert make and model number) datasheet" as this will give you the cable pinout for the panel.

It does vary with panels but I've seen some 40 pin panels where the backlight power is on pins 1-3 or 37-39 so maybe check either end.

Also strange that the Nvidia GPU is not shown in BIOS as according to this link for the BIOS settings for the laptop from Dell the discrete GPU info should be there. This is what it shows under the Device Information tab "dGPU Video Controller - Displays the discrete graphics information of the computer. There is also a "display brightness" option under the Video menu tab in BIOS that you may wish to play with to see if that alters anything

So you may have two problems:

No backlight for either GPU, integrated and discrete and also no video when using discrete GPU.

The video you're seeing now is from the integrated GPU as most likely the BIOS will default to it as it cannot detect the Nvidia, but perhaps when Windows loads it is set to use the Nvidia - I don't know but this seems reasonable.

Anyhow if you solve the backlight issue, don't be surprised if the Nvidia is not there when it should be.

You could also try to get into safe mode with an external display by starting the laptop and when it boots into Windows, force stop it by holding the power button operated until it shuts down.

Do this 3 times in a row i.e. start > boot > force shutdown > start > boot > force shutdown etc.

On the 3rd attempt it should boot into the Windows Recovery menus.

Select Troubleshoot> Advanced > see more recovery options > Startup settings > enable safe mode.

Once in safe mode you may be able to open the Nvidia app and select the Intel GPU as the primary adapter and then after that you should at least be able to start Windows and have an external monitor.

Just what I'd try.

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@J.R. Asprelli Check the voltages on your display adapter as well. Looking at some schematic it appears as if the backlight voltage comes from a DC-DC converter circuit so your voltage w(sh)ould be higher for the backlight than the rest

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