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Gaming laptop released in 2014 with an Nvidia 860M graphics card and a 15.6" display. Updated in 2015 with 960M graphics.

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Screen won't turn on, but everything else seems fine.

Some background info: I have a Lenovo Y50, I believe it's the y50-70 variant, but I'm not 100% sure. It's a 15.6inch with an i7, 16gb ram, sata drive, and an Nvidia 860m with 4gb of graphics. It was purchased in September of 2014, so it's a fairly early model of the y50. it's a bit beat up, but hasn't had any major functional issues to this point.

Now to the actual problem: When I boot the laptop, the keyboard backlight and status lights on the front all come on like normal, but the screen stays black (not just a black image being displayed, the screen is off). The problem has occured in the past, but was intermittent and could be fixed by letting it sit unplugged with the lid closed (I have no way of knowing if this actually helped, but it usually booted after that) for a few minutes before trying to boot again. The problem now seems quite permanent. I removed the backing last night and took a closer look, and the connections all appear to be fine. I'm not sure if it's relevant or not, but the laptop was left unplugged and powered off for about 72 hours before it refused to boot. The status light indicates that it still has battery, and I've tried it both with and without having the charger plugged it. I've also tried it with an external monitor without success.

My initial inclination is that there is a problem with the graphics card, or some other internals rather than the screen itself, but I really have no way of knowing, as hardware isn't my area of expertise. I'm a CS student, so if anyone could post answers ASAP, it would be VERY much appreciated.

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You could do what the person who answered suggested, but if you would like to find out what's causing the issue let's get a few things out of the way first: if your GPU is causing the problem or not. There is one way of testing: hook your laptop to an external monitor, a TV anything. If something shows up there, it's not the GPU, but something else, likely the LCD cable (not the backlight or the panel itself).

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Hi, have anyone solved this? I have the exact same issue!

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same issue - laptop screen goes blank when running on battery only

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Saw this thread and wanted to post a potential solution, as I had the same problem recently:

You can try resetting your computer by holding the power button down for ten seconds, then releasing. The next step would be to open the computer and disconnect the main battery for 10 seconds to reset it.

However, if you keep the computer plugged in for long periods of time, especially if you live somewhere with a dirty power source (for example, I live in Mexico), your computer may have locked itself up to protect itself from a power surge. The good news is, this isn't a mechanical failure, it's just a security mechanism.

In this case, you need to open the computer, disconnect the main battery, and find a smaller, 3v battery on the motherboard that starts the BIOS (this is a small, round object just above the main battery on the MoBo that says something like "CR2032-3V-etc" and has a red and a black wire coming out of it). To reset the BIOS battery, you unplug it from the MoBo just like you did for the main battery, wait 10 seconds and plug it back in. Make sure you ground yourself before working on the computer.

If this solves the problem for you, then to prevent future failures, you'll need to buy at least a new surge protector and ideally a voltage regulator or no-break system, as this means you have an unsafe electrical current charging your computer.

Note that if you are still getting the splash screen (the Lenovo logo appears on your screen for a couple seconds before the computer shuts off), the error is probably somewhere else.

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Thanks for the reply, I now believe that the error may not be the graphics card exclusively. The Lenovo service rep had me see if the Caps Lock and Num Lock keys work. They don't, which indicates something a bit more widespread. Might be the power supply or the motherboard, but it's probably not the GPU or display

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Did you ever manage to solve this problem? I'm having the exact same problem right now with my Y50, and it seems to be a problem with the BIOS, as once it boots everything works just fine.

I found this thread (http://www.tomsguide.com/answers/id-2914...) advising to upgrade or downgrade the BIOS, but I have the problem that the laptop won't even boot into BIOS! I left it on last night for 8 hours, and it never finished booting up :(

I really hope my laptop hasn't turned into a brick, so I'm trying to find a solution to boot into BIOS again.

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Hi @zman0956

What is the make and model number of the laptop if not a Lenovo Y50-70?

Create a Win 10 battery report to check on the status of the battery.

Compare the Design Capacity value versus the Full Charge Capacity value.

This is just to eliminate the battery as the problem

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Battery is not the issue. I have a new battery. When the battery is fully charged and I disconnect the power cable, the external monitor stays on but the laptop screen goes blank. Not an issue when the the power cable is connected to the laptop (both laptop and monitor screens are fine).

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@zman0956

You didn't mention at first that you had a new battery or that you tried it with an external monitor either. Saves repetition in answers

Try starting in safe mode and check.

Does it stay on when in BIOS menus?

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It turned out to be an issue with some motherboard connectors. I took the laptop to a Lenovo service center to have the motherboard replaced, but that model had been discontinued so they had to replace it for a refurbished board. The laptop worked fine afterwards, but I ended up selling it and buying a new one, just to be safe.

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Brent Heavey sera éternellement reconnaissant.
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