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Paper Tape
Posts: 2
Registered: ‎09-24-2017
Location: US
Views: 799
Message 1 of 4

3yo Y50 black screen; fine with external

Hi, I have about a 3 year old Y50. Recently I restarted it and the computer turns on but the screen doesn't work. I can connect it to an external monitor and can log in and use it fine. If I try to "extend the desktop" or anything like that, nothing happens to the laptop screen. I can still use the camera on the top of the screen, and the LED that indicates that it's on works. Seems the computer isn't recognizing it. Safe mode didn't help, and neither did taking out the battery and holding power for a while, and neither did updating the graphics card drivers. Neither did resetting the BIOS. Anything else I should try before attributing it to a hardware issue?

Sr Support Specialist
Posts: 9,318
Registered: ‎11-30-2015
Location: PH
Views: 761
Message 2 of 4

Re: 3yo Y50 black screen; fine with external

Hi tanyat


Welcome to the Community Forums.


Did you managed to have display in the BIOS?

Try to use a pen light if any image would appear faint.

If same black screen even on BIOS , you may want to reseat the LCD cable but if you need tools for it then best to have the LCD verified in a service center as it is more likely to be a LCD/ LCD cable hardware issue.


Hope this helps answer your query.



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Bit Torrent
Posts: 3,036
Registered: ‎12-11-2015
Location: US
Views: 758
Message 3 of 4

Re: 3yo Y50 black screen; fine with external

It is possible that the EDP cable that passes the video signal through the hinge is either loose or damage, or that the LCD (or its backlighting) has failed.    The cable would be most suspect, as they do go out over time from opening and closing the laptop.    


This video shows how to replace the screen on a non-touch Y50, but also shows how to access that cable on the display side too.    


Accessing the lower connector of the cable would require removing bottom cover, which I would recommend be step one so you can disconnect the battery, and then once the battery is disconnected, and with the AC power NOT plugged in, press and hold the power button for about 30-60 seconds.


If you do need the cable, it should be one of the following shown on page 95 of the Hardware Maintenance Manual for your system, but to make sure you get the right part, I would go to and enter your system's serial number and 


Description                                                           Lenovo FRU/Part#

EDP cable, EDP C Y50-70T FHD                       5C10F78775

EDP cable, EDP C Y50-70T UHD                      5C10F78851


Good Luck,

Paper Tape
Posts: 2
Registered: ‎09-24-2017
Location: US
Views: 661
Message 4 of 4

Re: 3yo Y50 black screen; fine with external

Hi, It took me a bit to get around to taking care of this, but your suggestion (the video) worked perfectly! I pried the screen open and the cable that connected the LCD to the motherboard must have been loose. I took it out and put it back in, and everything worked again! 

Thanks so much for the help and the video suggestion. 

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