I don't know what happened to this thing but it is getting frustrating. I unplugged my 9250 this morning and pressed the power button to turn it on. The tablet vibrates like normal when you turn it on. but the screen never comes on. It stays black. So I plugged in the dell adapter to connect it to an external display and the screen still stays black. So I thought maybe it is caught in a power saver loop. I opened it up and disconnected the battery for a few minutes. Plugged the battery back in and closed it up and I get the same thing. It does the same thing with the ac power plugged in as it does without the ac power plugged in. Any ideas what it is going on?It acts almost like the battery is almost dead but it was on the charger all night.I press the power button for 2 seconds and the power light comes on and the tablet vibrates. After about 25 seconds the power light goes off. I thought I would force it to shut down by holding the power button for 10 seconds. But after 2 seconds it vibrates and the power light comes on again. It is on the charger and the power light is off indicating that it isn't charging.
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Ouch!!! Being that you had it open, did you chech the screen connector? I bought a refurb XPS 12 9250 for $640. Picked it up by the keyboard while open, and since I carried it slightly tilted the screen fell to the wood floor and broke. The refurb did not have accidental damage so I got a used 4K screen off of eBay for $300. So much for my bargain. While installing the new screen, I also worked on the power button, taking it out and putting one layer of duct tape on the PCB motherboard side of the switch. I cut the tape from a paper pattern. The switch had a tendency to slip under the very small PCB mounted switch. You may want to take your torx screwdriver and reopen your 9250, check screen connections, and before reassembling it, turn it on by the vey small PCB switch. Before the screen broke, I first opened it up to disconnect the battery after the system froze and was unresponsive. That was before two BIOS updates, and newer drivers. Good luck ElAguila. Keep us posted if you get it working again.
All of the screen connectors are tightly connected. I don't know what is going on with the darn thing but this is very frustrating. I was trying to see if a key combination would get me to a bios screen like the key combos on a cell phone can get you to recovery mode. When I held the volume down button and then pressed the power button, the tablet vibrated and I could see the backlighting of the screen come on which it has not been doing. Then the entire screen turned white the red then green then blue. It would do this cycle several times and then back to the black screen.
Not sure if this will help, but.........
I don't really want to open my XPS 12 9250 to see if I can figure where the CMOS pins are, but seems, barring official Dell support, it would seem you have little to lose. Messing around with it wouldn't be so bad if this 9250 didn't cost so much.
I just remembered the ribbon cable and screen connector when I replaced my screen. It is very short and a bit difficult to connect. When the screen is separated from the back and you open it like a book, there can be tension on the ribbon cable that might pull it out of alignment in the connector. The ribbon needs to be carefully parallel to the connector when inserting it. I'm 66 years old and I needed a magnifying glass, but I think using one would help anyone. The connector has a thin plastic hinged flap. With the flap up, the ribbon can be inserted or removed. Push to flap down to lock the ribbon in place. This is not the same ribbon connector, but it works like the one in our XPS 12 9250's. Here is a 14 second youtube link:
I had thought of reseddtting the cmos but i didn't see the pins. They are probably under one of the several heatsinks on this thing. I will try it again today to see if I can find it. I will also double check that ribbon connector. Thanks for the info. I will let you know if something works.
This is the model # and (for the purpose of finding the CMOS pins) a non-informative link.
Mainboard: Dell Inc. Model 0Y5CWX, browser.primatelabs.com/.../8041181
I can't find a motherboard manual anywhere. Perhaps create a request at Dell about finding your CMOS pins.
Have you tried holding or tapping the F2 key to enter setup when you power on your 9250? Maybe hit the blue Fn key and tap F12 to increase the screen brightness.
Troubleshooting Dell LCD laptop screens.
I tried using the function key to brighten the screen but the keyboard is not working.Also I can't see that back glow that the screens have when they come on but haven't displayed anything yet. The only time I saw that was when I held the volume down and power keys at the same time. I am stumped at this point and thinking hardware failure.